TY  - CONF
AU  - Krstajić Pajić, Mila N.
AU  - Stevanović, Sanja I.
AU  - Radmilović, Vuk V.
AU  - Zabinski, Piotr
AU  - Elezović, Nevenka R.
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
AU  - Jovanović, Vladislava M.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7311
AB  - Formic acid is one of the most promising small organic molecules that can be used as fuel in polymer
electrolyte fuel cells. These systems are recognized as high-efficiency energy conversion devices which could
offer energy generated from electrochemical processes. At carbon supported platinum nanoparticles as state
of the art anodic catalysts formic acid oxidation reaction (FAOR) proceeds through a dual path mechanism
that includes the formation of CO in the indirect reaction pathway. Since CO is a catalytic poison, the best
way to address this problem is to synthesize catalysts that would either provide prompt CO oxidation and
removal, or favour the direct reaction pathway to completely avoid CO formation and electrode poisoning.
PtAu systems are considered as efficient catalysts for FAOR due to the ensemble effect of Au on Pt, however
the optimal ratio of these two elements is still quite vague. Given the experience with water in oil
microemulsion synthesis for preparation of shape controlled Pt nanoparticles,1 bimetallic PtAu/C
nanocatalysts were synthesized by the same procedure, following a simultaneous precursor reduction
methodology.2 The amount of the capping agent used, was varied in order to cause formation of
nanoparticles with different shape (cubic or tetrahedron like). Addition of a very low, but very finely dispersed
amount of Au significantly increases the catalytic activity, and also affects kinetic of the particle growth,
influencing the particle shape. Ordered structure of these particles contributes to their stability as well. These
results were obtained by Electrochemical and High Resolution Transmission Electron Microscopy
characterization (HRTEM) with Energy Dispersive X-ray Spectroscopy (EDXS), along with X-Ray Diffraction and
(XRD) and X-Ray Photoelectron Spectroscopy (XPS).
PB  - International Association of Physical Chemists
C3  - Book of Abstracts / 7th Regional Symposium on Electrochemistry – South East Europe & 8th Kurt Schwabe Symposium, Split, Croatia, May 27-30, 2019
T1  - Catalysis at nano level: Promoting Pt nanoparticle activity by Au decoration
SP  - 119
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7311
ER  - 

@conference{
author = "Krstajić Pajić, Mila N. and Stevanović, Sanja I. and Radmilović, Vuk V. and Zabinski, Piotr and Elezović, Nevenka R. and Radmilović, Velimir R. and Gojković, Snežana Lj. and Jovanović, Vladislava M.",
year = "2019",
abstract = "Formic acid is one of the most promising small organic molecules that can be used as fuel in polymer
electrolyte fuel cells. These systems are recognized as high-efficiency energy conversion devices which could
offer energy generated from electrochemical processes. At carbon supported platinum nanoparticles as state
of the art anodic catalysts formic acid oxidation reaction (FAOR) proceeds through a dual path mechanism
that includes the formation of CO in the indirect reaction pathway. Since CO is a catalytic poison, the best
way to address this problem is to synthesize catalysts that would either provide prompt CO oxidation and
removal, or favour the direct reaction pathway to completely avoid CO formation and electrode poisoning.
PtAu systems are considered as efficient catalysts for FAOR due to the ensemble effect of Au on Pt, however
the optimal ratio of these two elements is still quite vague. Given the experience with water in oil
microemulsion synthesis for preparation of shape controlled Pt nanoparticles,1 bimetallic PtAu/C
nanocatalysts were synthesized by the same procedure, following a simultaneous precursor reduction
methodology.2 The amount of the capping agent used, was varied in order to cause formation of
nanoparticles with different shape (cubic or tetrahedron like). Addition of a very low, but very finely dispersed
amount of Au significantly increases the catalytic activity, and also affects kinetic of the particle growth,
influencing the particle shape. Ordered structure of these particles contributes to their stability as well. These
results were obtained by Electrochemical and High Resolution Transmission Electron Microscopy
characterization (HRTEM) with Energy Dispersive X-ray Spectroscopy (EDXS), along with X-Ray Diffraction and
(XRD) and X-Ray Photoelectron Spectroscopy (XPS).",
publisher = "International Association of Physical Chemists",
journal = "Book of Abstracts / 7th Regional Symposium on Electrochemistry – South East Europe & 8th Kurt Schwabe Symposium, Split, Croatia, May 27-30, 2019",
title = "Catalysis at nano level: Promoting Pt nanoparticle activity by Au decoration",
pages = "119",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7311"
}

Krstajić Pajić, M. N., Stevanović, S. I., Radmilović, V. V., Zabinski, P., Elezović, N. R., Radmilović, V. R., Gojković, S. Lj.,& Jovanović, V. M.. (2019). Catalysis at nano level: Promoting Pt nanoparticle activity by Au decoration. in Book of Abstracts / 7th Regional Symposium on Electrochemistry – South East Europe & 8th Kurt Schwabe Symposium, Split, Croatia, May 27-30, 2019
International Association of Physical Chemists., 119.
https://hdl.handle.net/21.15107/rcub_technorep_7311

Krstajić Pajić MN, Stevanović SI, Radmilović VV, Zabinski P, Elezović NR, Radmilović VR, Gojković SL, Jovanović VM. Catalysis at nano level: Promoting Pt nanoparticle activity by Au decoration. in Book of Abstracts / 7th Regional Symposium on Electrochemistry – South East Europe & 8th Kurt Schwabe Symposium, Split, Croatia, May 27-30, 2019. 2019;:119.
https://hdl.handle.net/21.15107/rcub_technorep_7311 .

Krstajić Pajić, Mila N., Stevanović, Sanja I., Radmilović, Vuk V., Zabinski, Piotr, Elezović, Nevenka R., Radmilović, Velimir R., Gojković, Snežana Lj., Jovanović, Vladislava M., "Catalysis at nano level: Promoting Pt nanoparticle activity by Au decoration" in Book of Abstracts / 7th Regional Symposium on Electrochemistry – South East Europe & 8th Kurt Schwabe Symposium, Split, Croatia, May 27-30, 2019 (2019):119,
https://hdl.handle.net/21.15107/rcub_technorep_7311 .

TY  - CONF
AU  - Krstajić Pajić, Mila N.
AU  - Stevanović, Sanja I.
AU  - Radmilović, Vuk V.
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
AU  - Jovanović, Vladislava M.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7312
AB  - Sve veće potrebe za proizvodnjom energije iz obovljivih izvora, uslovile su intenzivna
istraživanja u pravcu korišćenja ekološki prihvatljivih goriva. Oksidacijom vodonika u
gorivnim spregovima postiže se proizvodnja energije na ekološki prihvatljiv način, a umesto
vodonika mogu se koristiti i mali organski molekuli, poput mravlje kiseline koji su bezbedniji
za upotrebu i transport. Njihova oksidacija u anodnom delu polimer elektrolitnog gorivnog
sprega zahteva upotrebu plemenitih metala kao katalizatora, jer mogu da omoguće njihovu
dehidrogenaciju kao početni stupanj reakcije. Kao do sada najbolji katalizatori za oksidaciju
mravlje kiseline pokazali su se bimetalni PtAu katalizatori, zahvaljujući geometrijskom
efektu zlata na platinu kojim se favorizuje direktni mehanizam oksidacije i izbegava
stvaranje reakcionog intermedijara CO koji se ponaša kao katalitički otrov. U ovom radu
PtAu katalizatori na aktiviranom ugljeniku sintetizovani su mikroemulzionim postupkom, sa
uticajem aditiva kojim je izmenjen oblik čestica, čime je dodatno poboljšana njihova
katalitička sposobnost.
AB  - Ever rising needs for renewable energy, in order to decrease pollution and exploitation of
limited fossil resources, have caused intensive research on the use of eco friendly fuels.
Hydrogen electrooxidation in fuel cells is a promissing process of zero-emission energy
production from a renewable source. Furthermore, using small organic molecules (SOMs)
such as formic acid, instead of hydrogen, makes this process safer and fuel transportation
easier to manage. Oxidation of SOMs in fuel cells requires a noble metal as catalyst, capable
of enabling dehydrogenation of SOM as an initial step of the reaction. Bimetallic PtAu
catalysts are the best catalysts for formic acid oxidation so far, due to the ensemble effect
of Au on Pt which favors the direct oxidation of formic acid, avoiding the formation of CO
that acts as a catalytic poison. In this reseach carbon supported PtAu nanocatalysts were
synthesized by a microemulsion method, in presence of a capping agent that affected the
particle shape, which made further improvement in catalytic performance of these
nanoparticles.
PB  - Beograd : Srpsko hemijsko društvo
C3  - Kratki izvodi radova / 56. savetovanje Srpskog hemijskog društva , Niš 7. i 8. juni 2019
T1  - Bimetalni nanokatalizatori kontrolisanog oblika za anodne reakcije u gorivnim galvanskim spregovima
T1  - Shape controlled bimetallic nanocatalysts for anodic reactions in fuel cells
SP  - 25
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7312
ER  - 

@conference{
author = "Krstajić Pajić, Mila N. and Stevanović, Sanja I. and Radmilović, Vuk V. and Radmilović, Velimir R. and Gojković, Snežana Lj. and Jovanović, Vladislava M.",
year = "2019",
abstract = "Sve veće potrebe za proizvodnjom energije iz obovljivih izvora, uslovile su intenzivna
istraživanja u pravcu korišćenja ekološki prihvatljivih goriva. Oksidacijom vodonika u
gorivnim spregovima postiže se proizvodnja energije na ekološki prihvatljiv način, a umesto
vodonika mogu se koristiti i mali organski molekuli, poput mravlje kiseline koji su bezbedniji
za upotrebu i transport. Njihova oksidacija u anodnom delu polimer elektrolitnog gorivnog
sprega zahteva upotrebu plemenitih metala kao katalizatora, jer mogu da omoguće njihovu
dehidrogenaciju kao početni stupanj reakcije. Kao do sada najbolji katalizatori za oksidaciju
mravlje kiseline pokazali su se bimetalni PtAu katalizatori, zahvaljujući geometrijskom
efektu zlata na platinu kojim se favorizuje direktni mehanizam oksidacije i izbegava
stvaranje reakcionog intermedijara CO koji se ponaša kao katalitički otrov. U ovom radu
PtAu katalizatori na aktiviranom ugljeniku sintetizovani su mikroemulzionim postupkom, sa
uticajem aditiva kojim je izmenjen oblik čestica, čime je dodatno poboljšana njihova
katalitička sposobnost., Ever rising needs for renewable energy, in order to decrease pollution and exploitation of
limited fossil resources, have caused intensive research on the use of eco friendly fuels.
Hydrogen electrooxidation in fuel cells is a promissing process of zero-emission energy
production from a renewable source. Furthermore, using small organic molecules (SOMs)
such as formic acid, instead of hydrogen, makes this process safer and fuel transportation
easier to manage. Oxidation of SOMs in fuel cells requires a noble metal as catalyst, capable
of enabling dehydrogenation of SOM as an initial step of the reaction. Bimetallic PtAu
catalysts are the best catalysts for formic acid oxidation so far, due to the ensemble effect
of Au on Pt which favors the direct oxidation of formic acid, avoiding the formation of CO
that acts as a catalytic poison. In this reseach carbon supported PtAu nanocatalysts were
synthesized by a microemulsion method, in presence of a capping agent that affected the
particle shape, which made further improvement in catalytic performance of these
nanoparticles.",
publisher = "Beograd : Srpsko hemijsko društvo",
journal = "Kratki izvodi radova / 56. savetovanje Srpskog hemijskog društva , Niš 7. i 8. juni 2019",
title = "Bimetalni nanokatalizatori kontrolisanog oblika za anodne reakcije u gorivnim galvanskim spregovima, Shape controlled bimetallic nanocatalysts for anodic reactions in fuel cells",
pages = "25",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7312"
}

Krstajić Pajić, M. N., Stevanović, S. I., Radmilović, V. V., Radmilović, V. R., Gojković, S. Lj.,& Jovanović, V. M.. (2019). Bimetalni nanokatalizatori kontrolisanog oblika za anodne reakcije u gorivnim galvanskim spregovima. in Kratki izvodi radova / 56. savetovanje Srpskog hemijskog društva , Niš 7. i 8. juni 2019
Beograd : Srpsko hemijsko društvo., 25.
https://hdl.handle.net/21.15107/rcub_technorep_7312

Krstajić Pajić MN, Stevanović SI, Radmilović VV, Radmilović VR, Gojković SL, Jovanović VM. Bimetalni nanokatalizatori kontrolisanog oblika za anodne reakcije u gorivnim galvanskim spregovima. in Kratki izvodi radova / 56. savetovanje Srpskog hemijskog društva , Niš 7. i 8. juni 2019. 2019;:25.
https://hdl.handle.net/21.15107/rcub_technorep_7312 .

Krstajić Pajić, Mila N., Stevanović, Sanja I., Radmilović, Vuk V., Radmilović, Velimir R., Gojković, Snežana Lj., Jovanović, Vladislava M., "Bimetalni nanokatalizatori kontrolisanog oblika za anodne reakcije u gorivnim galvanskim spregovima" in Kratki izvodi radova / 56. savetovanje Srpskog hemijskog društva , Niš 7. i 8. juni 2019 (2019):25,
https://hdl.handle.net/21.15107/rcub_technorep_7312 .

TY  - JOUR
AU  - Krstajić-Pajić, Mila
AU  - Stevanović, Sanja
AU  - Radmilović, Vuk
AU  - Gavrilović-Wohlmuther, Aleksandra
AU  - Zabinski, Piotr
AU  - Elezović, Nevenka R.
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
AU  - Jovanović, Vladislava M.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4330
AB  - Low loading PtAu nanoparticles supported on high area carbon were synthesized by water-in-oil microemulsion method and examined for formic acid and methanol oxidation. Prepared catalyst powder was characterized by Xray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). These techniques revealed that the catalyst contains rather agglomerated quasi-spherical particles, similar to 4 nm diameter, composed of a solid solution of Pt and Au with only similar to 4 at% of Au. In spite of such low Au content, both onset and peak potentials for CO oxidation are shifted some 150 mV to more positive values in comparison to Pt synthesized in the same manner due to stronger binding of CO as a result of notable electronic effect. It is important that this small quantity of Au also significantly influences oxidation of formic acid promoting direct path and suppressing indirect path in formic acid oxidation in a degree as expected by a much larger quantity of Au. Such improvement could be due exclusively by ensemble effect of high number of small Pt domains which formation could be possible only by very fine dispersion of such low Au quantity. High number of small Pt domains is corroborated by lower activity for methanol oxidation in comparison to Pt catalyst synthesized by the same procedure. These results emphasize the importance of the Au dispersion on the surface of Pt over its quantity in PtAu catalyst with regards to both, the ensemble and the electronic effects.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method
EP  - 593
SP  - 585
VL  - 243
DO  - 10.1016/j.apcatb.2018.10.064
ER  - 

@article{
author = "Krstajić-Pajić, Mila and Stevanović, Sanja and Radmilović, Vuk and Gavrilović-Wohlmuther, Aleksandra and Zabinski, Piotr and Elezović, Nevenka R. and Radmilović, Velimir R. and Gojković, Snežana Lj. and Jovanović, Vladislava M.",
year = "2019",
abstract = "Low loading PtAu nanoparticles supported on high area carbon were synthesized by water-in-oil microemulsion method and examined for formic acid and methanol oxidation. Prepared catalyst powder was characterized by Xray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). These techniques revealed that the catalyst contains rather agglomerated quasi-spherical particles, similar to 4 nm diameter, composed of a solid solution of Pt and Au with only similar to 4 at% of Au. In spite of such low Au content, both onset and peak potentials for CO oxidation are shifted some 150 mV to more positive values in comparison to Pt synthesized in the same manner due to stronger binding of CO as a result of notable electronic effect. It is important that this small quantity of Au also significantly influences oxidation of formic acid promoting direct path and suppressing indirect path in formic acid oxidation in a degree as expected by a much larger quantity of Au. Such improvement could be due exclusively by ensemble effect of high number of small Pt domains which formation could be possible only by very fine dispersion of such low Au quantity. High number of small Pt domains is corroborated by lower activity for methanol oxidation in comparison to Pt catalyst synthesized by the same procedure. These results emphasize the importance of the Au dispersion on the surface of Pt over its quantity in PtAu catalyst with regards to both, the ensemble and the electronic effects.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method",
pages = "593-585",
volume = "243",
doi = "10.1016/j.apcatb.2018.10.064"
}

Krstajić-Pajić, M., Stevanović, S., Radmilović, V., Gavrilović-Wohlmuther, A., Zabinski, P., Elezović, N. R., Radmilović, V. R., Gojković, S. Lj.,& Jovanović, V. M.. (2019). Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method. in Applied Catalysis B-Environmental
Elsevier Science Bv, Amsterdam., 243, 585-593.
https://doi.org/10.1016/j.apcatb.2018.10.064

Krstajić-Pajić M, Stevanović S, Radmilović V, Gavrilović-Wohlmuther A, Zabinski P, Elezović NR, Radmilović VR, Gojković SL, Jovanović VM. Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method. in Applied Catalysis B-Environmental. 2019;243:585-593.
doi:10.1016/j.apcatb.2018.10.064 .

Krstajić-Pajić, Mila, Stevanović, Sanja, Radmilović, Vuk, Gavrilović-Wohlmuther, Aleksandra, Zabinski, Piotr, Elezović, Nevenka R., Radmilović, Velimir R., Gojković, Snežana Lj., Jovanović, Vladislava M., "Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method" in Applied Catalysis B-Environmental, 243 (2019):585-593,
https://doi.org/10.1016/j.apcatb.2018.10.064 . .

TY  - JOUR
AU  - Krstajić-Pajić, Mila
AU  - Stevanović, Sanja
AU  - Radmilović, Vuk
AU  - Gavrilović-Wohlmuther, Aleksandra
AU  - Rogan, Jelena
AU  - Radmilović, Velimir R.
AU  - Jovanović, Vladislava M.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3832
AB  - PtAu systems are recognized as good catalysts for the oxidation of formic acid electrooxidation, which is investigated as a possible anodic reaction in low-temperature fuel cells. In this research, bimetallic PtAu nanoparticles, supported on high area carbon Vulcan XC-72R, were synthesized by water in oil microemulsion method. The precursor reduction process took place in a single microemulsion, simultaneously, in the presence of 35% of HCl in the water phase, as a capping agent. Electrochemical behavior of the PtAu/C catalyst was investigated at as prepared electrodes by cyclic voltammetry in 0.5M H2SO4 as a supporting electrolyte, and also in the oxidation of adsorbed CO. The results were compared to the Pt/C catalyst prepared by the same synthesis procedure. PtAu/C catalyst powder was also characterized by X-Ray Diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM) and Energy Dispersive X-Ray Spectroscopy (EDS). Average particle diameter, of 2nm, was calculated from XRD data, which is close to the value of 2.82 nm obtained from TEM images. Compared to identically synthesized Pt nanoparticles, the bimetallic ones are significantly smaller. EDS maps of PtAu/C sample confirm the presence of both elements, and indicate a very fine distribution of Au in the sample. Elemental composition of about 20% Au and 80% Pt was also determined from these maps. Prepared catalyst was tested for formic acid electro-oxidation in terms of its activity and stability over the long term cycling. The voltammograms recorded indicate the change of reaction mechanism and better utilization of the catalyst surface in comparison to Pt/C.
AB  - PtAu sistemi se smatraju veoma dobrim katalizatorima za elektrooksidaciju mravlje kiseline, kao moguće anodne reakcije u niskotemperaturnim gorivnim galvanskim spregovima. U ovom radu bimetalne PtAu nanočestice sintetizovane su mikromulzionim postupkom, i u toku sinteze nanete na ugljenični nosač Vulcan XC-72R. Procesi redukcije prekursora odigravaju se simultano, unutar vodene faze iste mikroemulzije, u prisustvu 35% HCl. Elektrohemijske karakteristike katalizatora ispitivane su cikličnom voltametrijomv na 'as prepared' elektrodama u 0.5M H2SO4 kao osnovnom elektrolitu, kao i prilikom oksidacije adsorbovanog CO. Rezultati su upoređeni sa Pt/C katalizatorom sintetizovanim istim postupkom i pod istovetnim uslovima. Pripremljeni PtAu/C prah okarakterisan je takođe difrakcijom X-zraka, transmisionom elektronskom mikroskopijom i energetski disperzionom spektroskoijom. Veličina čestice određena analizom difraktograma X-zraka iznosi 2nm, što je blisko vrednosti dobijenoj analizom TEM snimaka od 2.82 nm. U poređenju sa Pt nanočesticama sintetizovanim na isti način, bimetalne nanočestice su znatno manjeg prečnika. Mape uzorka PtAu/C dobijene energetski disperzionom spektroskopijom potvrđuju prisustvo oba elementa i pokazuju veoma finu distribuciju Au u uzorku. Analizo mapa utvrđeno je i da je katalizator sastava 20% Au i 80% Pt. Konačno, ispitane su aktivnost i stabilnost bimetalnog katalizatora za oksidaciju mravlje kiseline. Snimljeni voltamogrami ukazuju na promenu reakcionog mehanizma i bolje iskorišćenje površine katalizatora u poređenju ra Pt/C katalizatorom sintetizovanim istim postupkom.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - PtAu catalyst with enhanced activity for formic acid oxidation
T1  - PtAu katalizator sa poboljšanom aktivnošću za reakciju oksidacije mravlje kiseline
EP  - 166
IS  - 2
SP  - 159
VL  - 59
DO  - 10.5937/ZasMat1802159K
ER  - 

@article{
author = "Krstajić-Pajić, Mila and Stevanović, Sanja and Radmilović, Vuk and Gavrilović-Wohlmuther, Aleksandra and Rogan, Jelena and Radmilović, Velimir R. and Jovanović, Vladislava M.",
year = "2018",
abstract = "PtAu systems are recognized as good catalysts for the oxidation of formic acid electrooxidation, which is investigated as a possible anodic reaction in low-temperature fuel cells. In this research, bimetallic PtAu nanoparticles, supported on high area carbon Vulcan XC-72R, were synthesized by water in oil microemulsion method. The precursor reduction process took place in a single microemulsion, simultaneously, in the presence of 35% of HCl in the water phase, as a capping agent. Electrochemical behavior of the PtAu/C catalyst was investigated at as prepared electrodes by cyclic voltammetry in 0.5M H2SO4 as a supporting electrolyte, and also in the oxidation of adsorbed CO. The results were compared to the Pt/C catalyst prepared by the same synthesis procedure. PtAu/C catalyst powder was also characterized by X-Ray Diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM) and Energy Dispersive X-Ray Spectroscopy (EDS). Average particle diameter, of 2nm, was calculated from XRD data, which is close to the value of 2.82 nm obtained from TEM images. Compared to identically synthesized Pt nanoparticles, the bimetallic ones are significantly smaller. EDS maps of PtAu/C sample confirm the presence of both elements, and indicate a very fine distribution of Au in the sample. Elemental composition of about 20% Au and 80% Pt was also determined from these maps. Prepared catalyst was tested for formic acid electro-oxidation in terms of its activity and stability over the long term cycling. The voltammograms recorded indicate the change of reaction mechanism and better utilization of the catalyst surface in comparison to Pt/C., PtAu sistemi se smatraju veoma dobrim katalizatorima za elektrooksidaciju mravlje kiseline, kao moguće anodne reakcije u niskotemperaturnim gorivnim galvanskim spregovima. U ovom radu bimetalne PtAu nanočestice sintetizovane su mikromulzionim postupkom, i u toku sinteze nanete na ugljenični nosač Vulcan XC-72R. Procesi redukcije prekursora odigravaju se simultano, unutar vodene faze iste mikroemulzije, u prisustvu 35% HCl. Elektrohemijske karakteristike katalizatora ispitivane su cikličnom voltametrijomv na 'as prepared' elektrodama u 0.5M H2SO4 kao osnovnom elektrolitu, kao i prilikom oksidacije adsorbovanog CO. Rezultati su upoređeni sa Pt/C katalizatorom sintetizovanim istim postupkom i pod istovetnim uslovima. Pripremljeni PtAu/C prah okarakterisan je takođe difrakcijom X-zraka, transmisionom elektronskom mikroskopijom i energetski disperzionom spektroskoijom. Veličina čestice određena analizom difraktograma X-zraka iznosi 2nm, što je blisko vrednosti dobijenoj analizom TEM snimaka od 2.82 nm. U poređenju sa Pt nanočesticama sintetizovanim na isti način, bimetalne nanočestice su znatno manjeg prečnika. Mape uzorka PtAu/C dobijene energetski disperzionom spektroskopijom potvrđuju prisustvo oba elementa i pokazuju veoma finu distribuciju Au u uzorku. Analizo mapa utvrđeno je i da je katalizator sastava 20% Au i 80% Pt. Konačno, ispitane su aktivnost i stabilnost bimetalnog katalizatora za oksidaciju mravlje kiseline. Snimljeni voltamogrami ukazuju na promenu reakcionog mehanizma i bolje iskorišćenje površine katalizatora u poređenju ra Pt/C katalizatorom sintetizovanim istim postupkom.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "PtAu catalyst with enhanced activity for formic acid oxidation, PtAu katalizator sa poboljšanom aktivnošću za reakciju oksidacije mravlje kiseline",
pages = "166-159",
number = "2",
volume = "59",
doi = "10.5937/ZasMat1802159K"
}

Krstajić-Pajić, M., Stevanović, S., Radmilović, V., Gavrilović-Wohlmuther, A., Rogan, J., Radmilović, V. R.,& Jovanović, V. M.. (2018). PtAu catalyst with enhanced activity for formic acid oxidation. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 59(2), 159-166.
https://doi.org/10.5937/ZasMat1802159K

Krstajić-Pajić M, Stevanović S, Radmilović V, Gavrilović-Wohlmuther A, Rogan J, Radmilović VR, Jovanović VM. PtAu catalyst with enhanced activity for formic acid oxidation. in Zaštita materijala. 2018;59(2):159-166.
doi:10.5937/ZasMat1802159K .

Krstajić-Pajić, Mila, Stevanović, Sanja, Radmilović, Vuk, Gavrilović-Wohlmuther, Aleksandra, Rogan, Jelena, Radmilović, Velimir R., Jovanović, Vladislava M., "PtAu catalyst with enhanced activity for formic acid oxidation" in Zaštita materijala, 59, no. 2 (2018):159-166,
https://doi.org/10.5937/ZasMat1802159K . .

TY  - JOUR
AU  - Tripković, Dušan
AU  - Stevanović, Sanja
AU  - Gavrilović, Aleksandra
AU  - Rogan, Jelena
AU  - Lačnjevac, Uroš
AU  - Kravić, Tamara
AU  - Jovanović, Vladislava M.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3978
AB  - In our previous paper, we described in detail studies of Sn influence on electrocatalytic activity of PtSn catalyst for CO and formic acid oxidation (StevanoviAc et al., J. Phys. Chem. C, 118 (2014) 278-289). The catalyst was composed of a Pt phase, Pt3Sn alloy and very small SnO2 particles. Different electrochemical treatment enabled studies of PtSn/C having Sn both in surface and subsurface layers and skeleton structure of this catalyst with Sn only in subsurface layers. The results obtained revealed the promotional effect of surface Sn whether alloyed or as oxide above all in preventing accumulation of CO and blocking the surface Pt atoms. As a consequence, in formic acid oxidation, the currents are not entering the plateau but increasing constantly until reaching a maximum. It was concluded that at lower potentials the effect of Sn on formic acid oxidation was predominantly electronic but with increasing the potential bi-functional mechanism prevailed due to the leading role of SnO2. This role of SnO2 is restated in the present study. Therefore, CO and formic acid oxidation were examined at PtSnO2/C catalyst. The catalyst was synthesised by the same microwave-assisted polyol procedure. According to XRD analysis, the catalyst is composed of a Pt phase and SnO2 phase. The reactions were examined on PtSnO2/C catalyst treated on the same way as PtSn/C. Comparing the results obtained, the role of SnO2 is confirmed and at the same time the significance of alloyed Sn and its electronic effect is revealed.
PB  - Springer, New York
T2  - Electrocatalysis
T1  - The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts
EP  - 85
IS  - 1
SP  - 76
VL  - 9
DO  - 10.1007/s12678-017-0424-4
ER  - 

@article{
author = "Tripković, Dušan and Stevanović, Sanja and Gavrilović, Aleksandra and Rogan, Jelena and Lačnjevac, Uroš and Kravić, Tamara and Jovanović, Vladislava M.",
year = "2018",
abstract = "In our previous paper, we described in detail studies of Sn influence on electrocatalytic activity of PtSn catalyst for CO and formic acid oxidation (StevanoviAc et al., J. Phys. Chem. C, 118 (2014) 278-289). The catalyst was composed of a Pt phase, Pt3Sn alloy and very small SnO2 particles. Different electrochemical treatment enabled studies of PtSn/C having Sn both in surface and subsurface layers and skeleton structure of this catalyst with Sn only in subsurface layers. The results obtained revealed the promotional effect of surface Sn whether alloyed or as oxide above all in preventing accumulation of CO and blocking the surface Pt atoms. As a consequence, in formic acid oxidation, the currents are not entering the plateau but increasing constantly until reaching a maximum. It was concluded that at lower potentials the effect of Sn on formic acid oxidation was predominantly electronic but with increasing the potential bi-functional mechanism prevailed due to the leading role of SnO2. This role of SnO2 is restated in the present study. Therefore, CO and formic acid oxidation were examined at PtSnO2/C catalyst. The catalyst was synthesised by the same microwave-assisted polyol procedure. According to XRD analysis, the catalyst is composed of a Pt phase and SnO2 phase. The reactions were examined on PtSnO2/C catalyst treated on the same way as PtSn/C. Comparing the results obtained, the role of SnO2 is confirmed and at the same time the significance of alloyed Sn and its electronic effect is revealed.",
publisher = "Springer, New York",
journal = "Electrocatalysis",
title = "The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts",
pages = "85-76",
number = "1",
volume = "9",
doi = "10.1007/s12678-017-0424-4"
}

Tripković, D., Stevanović, S., Gavrilović, A., Rogan, J., Lačnjevac, U., Kravić, T.,& Jovanović, V. M.. (2018). The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts. in Electrocatalysis
Springer, New York., 9(1), 76-85.
https://doi.org/10.1007/s12678-017-0424-4

Tripković D, Stevanović S, Gavrilović A, Rogan J, Lačnjevac U, Kravić T, Jovanović VM. The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts. in Electrocatalysis. 2018;9(1):76-85.
doi:10.1007/s12678-017-0424-4 .

Tripković, Dušan, Stevanović, Sanja, Gavrilović, Aleksandra, Rogan, Jelena, Lačnjevac, Uroš, Kravić, Tamara, Jovanović, Vladislava M., "The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts" in Electrocatalysis, 9, no. 1 (2018):76-85,
https://doi.org/10.1007/s12678-017-0424-4 . .

TY  - JOUR
AU  - Krstajić-Pajić, Mila
AU  - Stevanović, Sanja
AU  - Radmilović, Vuk
AU  - Gavrilović-Wohlmuther, Aleksandra
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
AU  - Jovanović, Vladislava M.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3221
AB  - In this research, a water-in-oil microemulsion method with HCl as a capping agent was applied to synthesize carbon supported Pt catalysts. Varying the concentration of HCl caused changes in the shape of obtained nanoparticles, i.e. preferential growth of certain facets. Addition of catalyst support in the synthesis process facilitated the cleaning procedures necessary to remove the surfactant residues. Prepared catalyst powders were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD analysis indicated the influence of HCl addition on the crystallite size and crystal habit. TEM revealed that addition of higher amounts of the capping agent led to the formation of a noticable amount of particles with concave cubic or branched-like structures. Influence of the catalyst particles shape on its electrochemical properties was tested in the oxidations of COads, ammonia and formic acid. The latter one was examined in terms of both activity and stability of as prepared and oxide-annealed (electrochemically treated) catalysts. The results clearly demonstrate that even small changes in the nanoparticle surface structure give rise to distinct modifications in their properties. Concave cubic particles, in comparison to other catalysts, show improved catalytic properties and the contribution of their preferentially oriented {100} facets is electrochemically detectable.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - Shape evolution of carbon supported Pt nanoparticles: From synthesis to application
EP  - 184
SP  - 174
VL  - 196
DO  - 10.1016/j.apcatb.2016.05.033
ER  - 

@article{
author = "Krstajić-Pajić, Mila and Stevanović, Sanja and Radmilović, Vuk and Gavrilović-Wohlmuther, Aleksandra and Radmilović, Velimir R. and Gojković, Snežana Lj. and Jovanović, Vladislava M.",
year = "2016",
abstract = "In this research, a water-in-oil microemulsion method with HCl as a capping agent was applied to synthesize carbon supported Pt catalysts. Varying the concentration of HCl caused changes in the shape of obtained nanoparticles, i.e. preferential growth of certain facets. Addition of catalyst support in the synthesis process facilitated the cleaning procedures necessary to remove the surfactant residues. Prepared catalyst powders were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD analysis indicated the influence of HCl addition on the crystallite size and crystal habit. TEM revealed that addition of higher amounts of the capping agent led to the formation of a noticable amount of particles with concave cubic or branched-like structures. Influence of the catalyst particles shape on its electrochemical properties was tested in the oxidations of COads, ammonia and formic acid. The latter one was examined in terms of both activity and stability of as prepared and oxide-annealed (electrochemically treated) catalysts. The results clearly demonstrate that even small changes in the nanoparticle surface structure give rise to distinct modifications in their properties. Concave cubic particles, in comparison to other catalysts, show improved catalytic properties and the contribution of their preferentially oriented {100} facets is electrochemically detectable.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "Shape evolution of carbon supported Pt nanoparticles: From synthesis to application",
pages = "184-174",
volume = "196",
doi = "10.1016/j.apcatb.2016.05.033"
}

Krstajić-Pajić, M., Stevanović, S., Radmilović, V., Gavrilović-Wohlmuther, A., Radmilović, V. R., Gojković, S. Lj.,& Jovanović, V. M.. (2016). Shape evolution of carbon supported Pt nanoparticles: From synthesis to application. in Applied Catalysis B-Environmental
Elsevier Science Bv, Amsterdam., 196, 174-184.
https://doi.org/10.1016/j.apcatb.2016.05.033

Krstajić-Pajić M, Stevanović S, Radmilović V, Gavrilović-Wohlmuther A, Radmilović VR, Gojković SL, Jovanović VM. Shape evolution of carbon supported Pt nanoparticles: From synthesis to application. in Applied Catalysis B-Environmental. 2016;196:174-184.
doi:10.1016/j.apcatb.2016.05.033 .

Krstajić-Pajić, Mila, Stevanović, Sanja, Radmilović, Vuk, Gavrilović-Wohlmuther, Aleksandra, Radmilović, Velimir R., Gojković, Snežana Lj., Jovanović, Vladislava M., "Shape evolution of carbon supported Pt nanoparticles: From synthesis to application" in Applied Catalysis B-Environmental, 196 (2016):174-184,
https://doi.org/10.1016/j.apcatb.2016.05.033 . .

TY  - JOUR
AU  - Krstajić-Pajić, Mila
AU  - Stevanović, Sanja
AU  - Radmilović, Vuk
AU  - Rogan, Jelena
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
AU  - Jovanović, Vladislava M.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3321
AB  - Pt nanoparticles supported on Vulcan XC-72R were synthesized by water-in-oil microemulsion method. By incorporating different amounts of HCl as a capping agent in the precursor-containing water phase, nanoparticle shape was varied. Influencing the growth of certain facets leads to the changes of the particle shape depending on the preferential facets. As a result, nanoparticles exhibit some of the electrochemical features typical for single crystals. Commonly employed synthesis procedure for water-in-oil microemulsion method was altered with the addition of catalyst support in the system and changing the catalyst cleaning steps. Prepared catalysts were characterized by thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and electrochemical methods. Activity and stability for methanol oxidation reaction (MOR), a structure-sensitive reaction, were tested. Electrochemical results reveal the influence of particle size, shape and exposed facets on the electrochemical processes. TEM investigations confirm electrochemical findings, while TGA verifies Pt loading in catalyst powder. Based on the results, optimal HCl concentration for cubic particle formation is determined, and structural effect on MOR activity and stability was tested. Cuboidal NPs show very good reaction activity and fair stability under applied experimental conditions.
PB  - Springer, New York
T2  - Journal of Solid State Electrochemistry
T1  - Pt/C nanocatalysts for methanol electrooxidation prepared by water-in-oil microemulsion method
EP  - 3414
IS  - 12
SP  - 3405
VL  - 20
DO  - 10.1007/s10008-016-3319-z
ER  - 

@article{
author = "Krstajić-Pajić, Mila and Stevanović, Sanja and Radmilović, Vuk and Rogan, Jelena and Radmilović, Velimir R. and Gojković, Snežana Lj. and Jovanović, Vladislava M.",
year = "2016",
abstract = "Pt nanoparticles supported on Vulcan XC-72R were synthesized by water-in-oil microemulsion method. By incorporating different amounts of HCl as a capping agent in the precursor-containing water phase, nanoparticle shape was varied. Influencing the growth of certain facets leads to the changes of the particle shape depending on the preferential facets. As a result, nanoparticles exhibit some of the electrochemical features typical for single crystals. Commonly employed synthesis procedure for water-in-oil microemulsion method was altered with the addition of catalyst support in the system and changing the catalyst cleaning steps. Prepared catalysts were characterized by thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and electrochemical methods. Activity and stability for methanol oxidation reaction (MOR), a structure-sensitive reaction, were tested. Electrochemical results reveal the influence of particle size, shape and exposed facets on the electrochemical processes. TEM investigations confirm electrochemical findings, while TGA verifies Pt loading in catalyst powder. Based on the results, optimal HCl concentration for cubic particle formation is determined, and structural effect on MOR activity and stability was tested. Cuboidal NPs show very good reaction activity and fair stability under applied experimental conditions.",
publisher = "Springer, New York",
journal = "Journal of Solid State Electrochemistry",
title = "Pt/C nanocatalysts for methanol electrooxidation prepared by water-in-oil microemulsion method",
pages = "3414-3405",
number = "12",
volume = "20",
doi = "10.1007/s10008-016-3319-z"
}

Krstajić-Pajić, M., Stevanović, S., Radmilović, V., Rogan, J., Radmilović, V. R., Gojković, S. Lj.,& Jovanović, V. M.. (2016). Pt/C nanocatalysts for methanol electrooxidation prepared by water-in-oil microemulsion method. in Journal of Solid State Electrochemistry
Springer, New York., 20(12), 3405-3414.
https://doi.org/10.1007/s10008-016-3319-z

Krstajić-Pajić M, Stevanović S, Radmilović V, Rogan J, Radmilović VR, Gojković SL, Jovanović VM. Pt/C nanocatalysts for methanol electrooxidation prepared by water-in-oil microemulsion method. in Journal of Solid State Electrochemistry. 2016;20(12):3405-3414.
doi:10.1007/s10008-016-3319-z .

Krstajić-Pajić, Mila, Stevanović, Sanja, Radmilović, Vuk, Rogan, Jelena, Radmilović, Velimir R., Gojković, Snežana Lj., Jovanović, Vladislava M., "Pt/C nanocatalysts for methanol electrooxidation prepared by water-in-oil microemulsion method" in Journal of Solid State Electrochemistry, 20, no. 12 (2016):3405-3414,
https://doi.org/10.1007/s10008-016-3319-z . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Jovanović, Vladislava M.
AU  - Rogan, Jelena
AU  - Kowal, Andrzej
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3220
AB  - Carbon supported platinum catalysts for ethanol electrooxidation were synthesized by modified polyol synthesis method, assisted by microwave or reflux heating. Synthesized catalysts were characterized by XRD, STM and TGA techniques to determine their structural and morphological properties. STM and XRD investigations revealed small particle size (~3nm), while TGA showed Pt loading of 20% in both samples. Electrocatalytic activity of prepared catalysts was examined by potentiodynamic measurements and compared to commercial Pt catalyst (Pt/C-Tanaka). The highest activity for ethanol electrooxidation was observed with Pt catalyst prepared by microwave irradiation. The increase in activity can be assigned to the benefits of microwave assisted synthesis, such as small particle size and homogeneous particle distribution on the support.
AB  - Platinski katalizatori na ugljeničnoj podlozi su sintetizovani korišćenjem modifikovanog poliol postupka uz primenu mikrotalasnog ili refluks zagrevanja za reakciju elektrooksidacije etanola. Dobijeni katalizatori su karakterisani strukturno i morfološki korišćenjem XRD, STM i TGA tehnika. STM i XRD ispitivanja su pokazala malu veličinu čestica (~3nm), dok je TGA pokazala da je sadržaj metala u katalizatoru 20%. Elektrokatalitička aktivnost sintetizovanih katalizatora je ispitivana potenciodinamičkim merenjima i upoređena sa komercijalnim platinskim katalizatorom (Pt/C-Tanaka). Najbolju aktivnost za elektrooksidaciju etanola pokazao je platinski katalizator sintetizovan uz korišćenje mikrotalasnog zagrevanja. Veća aktivnost se može pripisati prednostima mikrotalasnog zagrevanja u toku sinteze jer je dobijen katalizator sa malom veličinom i homogenom di stribucijom čestica.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction
T1  - Uticaj postupka sinteze na aktivnost platinskih katalizatora za reakciju elektrooksidacije etanola
EP  - 345
IS  - 2
SP  - 339
VL  - 57
DO  - 10.5937/ZasMat1602339S
ER  - 

@article{
author = "Stevanović, Sanja and Jovanović, Vladislava M. and Rogan, Jelena and Kowal, Andrzej",
year = "2016",
abstract = "Carbon supported platinum catalysts for ethanol electrooxidation were synthesized by modified polyol synthesis method, assisted by microwave or reflux heating. Synthesized catalysts were characterized by XRD, STM and TGA techniques to determine their structural and morphological properties. STM and XRD investigations revealed small particle size (~3nm), while TGA showed Pt loading of 20% in both samples. Electrocatalytic activity of prepared catalysts was examined by potentiodynamic measurements and compared to commercial Pt catalyst (Pt/C-Tanaka). The highest activity for ethanol electrooxidation was observed with Pt catalyst prepared by microwave irradiation. The increase in activity can be assigned to the benefits of microwave assisted synthesis, such as small particle size and homogeneous particle distribution on the support., Platinski katalizatori na ugljeničnoj podlozi su sintetizovani korišćenjem modifikovanog poliol postupka uz primenu mikrotalasnog ili refluks zagrevanja za reakciju elektrooksidacije etanola. Dobijeni katalizatori su karakterisani strukturno i morfološki korišćenjem XRD, STM i TGA tehnika. STM i XRD ispitivanja su pokazala malu veličinu čestica (~3nm), dok je TGA pokazala da je sadržaj metala u katalizatoru 20%. Elektrokatalitička aktivnost sintetizovanih katalizatora je ispitivana potenciodinamičkim merenjima i upoređena sa komercijalnim platinskim katalizatorom (Pt/C-Tanaka). Najbolju aktivnost za elektrooksidaciju etanola pokazao je platinski katalizator sintetizovan uz korišćenje mikrotalasnog zagrevanja. Veća aktivnost se može pripisati prednostima mikrotalasnog zagrevanja u toku sinteze jer je dobijen katalizator sa malom veličinom i homogenom di stribucijom čestica.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction, Uticaj postupka sinteze na aktivnost platinskih katalizatora za reakciju elektrooksidacije etanola",
pages = "345-339",
number = "2",
volume = "57",
doi = "10.5937/ZasMat1602339S"
}

Stevanović, S., Jovanović, V. M., Rogan, J.,& Kowal, A.. (2016). Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 57(2), 339-345.
https://doi.org/10.5937/ZasMat1602339S

Stevanović S, Jovanović VM, Rogan J, Kowal A. Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction. in Zaštita materijala. 2016;57(2):339-345.
doi:10.5937/ZasMat1602339S .

Stevanović, Sanja, Jovanović, Vladislava M., Rogan, Jelena, Kowal, Andrzej, "Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction" in Zaštita materijala, 57, no. 2 (2016):339-345,
https://doi.org/10.5937/ZasMat1602339S . .

TY  - CONF
AU  - Krstajić, Mila
AU  - Stevanović, Sanja
AU  - Radmilović, Vuk
AU  - Rogan, Jelena
AU  - Gavrilović-Wohlmuther, Aleksandra
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
AU  - Jovanović, Vladislava M.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2872
AB  - Electrocatalytic activity of platinum-based electrocatalysts used in fuel cells has been well recognized. However, significant attention remains on the particle shape and size control of such nanomaterials. Catalytic activity can be enhanced by alloying Pt with another element (e.g. Ru and Sn), or by supporting Pt on metal oxides, both of which involve a bifunctional effect. It is also possible to achieve better catalytic characteristics by exposing different Pt crystal facets, which alters chemical and electronic interactions (structural effect). In order to synthesize Pt nanoparticles of a pre-determined shape, water in oil microemulsion method was used, with a few modifications: carbon support (Vulcan XC-72R) was added into the microemulsion itself, just after the completion of the reduction reaction of H2PtCl6 with NaBH4 as the reducing agent and this was crucial for further improvements of the catalyst cleaning procedures. Microemulsion consisted of [n-heptane] / [polyethileneglycoldodecyether (BRIJ30)] / [0,1M H2PtCl6 in 0, 15, 25 and 35% HCl], so four Pt catalyst were formed using different amounts of HCl in the water phase of the microemulsion. In comparison to previously reported applications of the microemulsion method, where electrochemical treatment of catalysts before its application was necessary, this alteration of cleaning steps made use of the “as prepared” catalysts possible. Catalysts A (0% HCl), B (15% HCl), C (25% HCl) and D (35% HCl) were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD) and transmission electron microscopy (TEM), as well as with electrochemical characterization methods (cyclic voltammetry in supporting electrolyte, CO stripping). TEM images confirmed the presence of cubic Pt particles, and indicated their good dispersion on carbon support, while XRD patterns revealed the share of each plane orientation in all investigated catalysts. This acknowledged the influence of HCl in the microemulsion on the shape of Pt particles. Mean particle size was determined both by TEM and XRD investigations, which are in good accordance, and show that average diameters of these four catalysts vary from 3 to 8 nm.
PB  - Academician Evgeni Budevski Institute of Electrochemistry and Energy Systems Bulgarian Academy of Sciences, Sofia, Bulgaria
C3  - 5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
T1  - Shape Controlled, Carbon Supported Pt Anodic Catalysts for DFAFC
EP  - 78
SP  - 78
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2872
ER  - 

@conference{
author = "Krstajić, Mila and Stevanović, Sanja and Radmilović, Vuk and Rogan, Jelena and Gavrilović-Wohlmuther, Aleksandra and Radmilović, Velimir R. and Gojković, Snežana Lj. and Jovanović, Vladislava M.",
year = "2015",
abstract = "Electrocatalytic activity of platinum-based electrocatalysts used in fuel cells has been well recognized. However, significant attention remains on the particle shape and size control of such nanomaterials. Catalytic activity can be enhanced by alloying Pt with another element (e.g. Ru and Sn), or by supporting Pt on metal oxides, both of which involve a bifunctional effect. It is also possible to achieve better catalytic characteristics by exposing different Pt crystal facets, which alters chemical and electronic interactions (structural effect). In order to synthesize Pt nanoparticles of a pre-determined shape, water in oil microemulsion method was used, with a few modifications: carbon support (Vulcan XC-72R) was added into the microemulsion itself, just after the completion of the reduction reaction of H2PtCl6 with NaBH4 as the reducing agent and this was crucial for further improvements of the catalyst cleaning procedures. Microemulsion consisted of [n-heptane] / [polyethileneglycoldodecyether (BRIJ30)] / [0,1M H2PtCl6 in 0, 15, 25 and 35% HCl], so four Pt catalyst were formed using different amounts of HCl in the water phase of the microemulsion. In comparison to previously reported applications of the microemulsion method, where electrochemical treatment of catalysts before its application was necessary, this alteration of cleaning steps made use of the “as prepared” catalysts possible. Catalysts A (0% HCl), B (15% HCl), C (25% HCl) and D (35% HCl) were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD) and transmission electron microscopy (TEM), as well as with electrochemical characterization methods (cyclic voltammetry in supporting electrolyte, CO stripping). TEM images confirmed the presence of cubic Pt particles, and indicated their good dispersion on carbon support, while XRD patterns revealed the share of each plane orientation in all investigated catalysts. This acknowledged the influence of HCl in the microemulsion on the shape of Pt particles. Mean particle size was determined both by TEM and XRD investigations, which are in good accordance, and show that average diameters of these four catalysts vary from 3 to 8 nm.",
publisher = "Academician Evgeni Budevski Institute of Electrochemistry and Energy Systems Bulgarian Academy of Sciences, Sofia, Bulgaria",
journal = "5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts",
title = "Shape Controlled, Carbon Supported Pt Anodic Catalysts for DFAFC",
pages = "78-78",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2872"
}

Krstajić, M., Stevanović, S., Radmilović, V., Rogan, J., Gavrilović-Wohlmuther, A., Radmilović, V. R., Gojković, S. Lj.,& Jovanović, V. M.. (2015). Shape Controlled, Carbon Supported Pt Anodic Catalysts for DFAFC. in 5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
Academician Evgeni Budevski Institute of Electrochemistry and Energy Systems Bulgarian Academy of Sciences, Sofia, Bulgaria., 78-78.
https://hdl.handle.net/21.15107/rcub_technorep_2872

Krstajić M, Stevanović S, Radmilović V, Rogan J, Gavrilović-Wohlmuther A, Radmilović VR, Gojković SL, Jovanović VM. Shape Controlled, Carbon Supported Pt Anodic Catalysts for DFAFC. in 5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts. 2015;:78-78.
https://hdl.handle.net/21.15107/rcub_technorep_2872 .

Krstajić, Mila, Stevanović, Sanja, Radmilović, Vuk, Rogan, Jelena, Gavrilović-Wohlmuther, Aleksandra, Radmilović, Velimir R., Gojković, Snežana Lj., Jovanović, Vladislava M., "Shape Controlled, Carbon Supported Pt Anodic Catalysts for DFAFC" in 5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts (2015):78-78,
https://hdl.handle.net/21.15107/rcub_technorep_2872 .

TY  - JOUR
AU  - Krstajić, Mila
AU  - Stevanović, Sanja
AU  - Rogan, Jelena
AU  - Gojković, Snežana Lj.
AU  - Jovanović, Vladislava M.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2910
AB  - Pt-based nanocatalysts supported on Vulcan XC-72R carbon, were prepared by water-in-oil microemulsion method, with addition of various amounts of HCl in the water phase. Polyethileneglycoldodecylether (BRIJ 30) was used as a surfactant, which influenced the Pt surface structure, along with HCl. Catalysts prepared with addition of 0, 15, 25 and 35 % of HCl during the synthesis, were electrochemically characterised in 0,5 M H2SO4 using cyclic voltammetry and CO oxidation. Formic acid electrooxidation was examined on all investigated catalysts, in terms of their electrocatalytic activity and stability. Platinum loading on carbon support was examined by Thermogravimetric analysis. Catalysts showed different features in hydrogen region, and slight differences in formic acid oxidation mechanisms.
AB  - Platinski nano-katalizatori na ugljeničnom nosaču Vulcan XC-72R sintetizovani su mikroemulzionom metodom, sa različitim sadržajem HCl u vodenoj fazi mikroemulzije. Kao surfaktant korišćen je polietilenglikol-dodeciletar (BRIJ30), čija je uloga da, zajedno sa HCl, utiče na strukturu površine platine. Katalizatori, koji su pripremljeni sa 0, 15, 25 i 35 % HCl u vodenoj fazi, okarakterisani su elektrohemijski u 0,5 M H2SO4, cikličnom voltametrijom i oksidacijom CO. Aktivnost i stabilnost sva četiri katalizatora ispitana je za oksidaciju mravlje kiseline. Udeo platine u prahu pripremljenih katalizatora određen je termogravimetrijskom analizom. Katalizatori su pokazali različito ponašanje u vodoničnoj oblasti osnovnih voltamograma, kao i različitu aktivnost i stabilnost za oksidaciju mravlje kiseline.
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Formic acid electrooxidation on carbon supported platinum catalyst with preferential plane orientation
T1  - Oksidacija mravlje kiseline na platinskim katalizatorima na ugljeničnom nosaču sa preferencijalno orijentisanim ravnima
EP  - 208
IS  - 2
SP  - 203
VL  - 70
DO  - 10.5937/tehnika1502203K
ER  - 

@article{
author = "Krstajić, Mila and Stevanović, Sanja and Rogan, Jelena and Gojković, Snežana Lj. and Jovanović, Vladislava M.",
year = "2015",
abstract = "Pt-based nanocatalysts supported on Vulcan XC-72R carbon, were prepared by water-in-oil microemulsion method, with addition of various amounts of HCl in the water phase. Polyethileneglycoldodecylether (BRIJ 30) was used as a surfactant, which influenced the Pt surface structure, along with HCl. Catalysts prepared with addition of 0, 15, 25 and 35 % of HCl during the synthesis, were electrochemically characterised in 0,5 M H2SO4 using cyclic voltammetry and CO oxidation. Formic acid electrooxidation was examined on all investigated catalysts, in terms of their electrocatalytic activity and stability. Platinum loading on carbon support was examined by Thermogravimetric analysis. Catalysts showed different features in hydrogen region, and slight differences in formic acid oxidation mechanisms., Platinski nano-katalizatori na ugljeničnom nosaču Vulcan XC-72R sintetizovani su mikroemulzionom metodom, sa različitim sadržajem HCl u vodenoj fazi mikroemulzije. Kao surfaktant korišćen je polietilenglikol-dodeciletar (BRIJ30), čija je uloga da, zajedno sa HCl, utiče na strukturu površine platine. Katalizatori, koji su pripremljeni sa 0, 15, 25 i 35 % HCl u vodenoj fazi, okarakterisani su elektrohemijski u 0,5 M H2SO4, cikličnom voltametrijom i oksidacijom CO. Aktivnost i stabilnost sva četiri katalizatora ispitana je za oksidaciju mravlje kiseline. Udeo platine u prahu pripremljenih katalizatora određen je termogravimetrijskom analizom. Katalizatori su pokazali različito ponašanje u vodoničnoj oblasti osnovnih voltamograma, kao i različitu aktivnost i stabilnost za oksidaciju mravlje kiseline.",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Formic acid electrooxidation on carbon supported platinum catalyst with preferential plane orientation, Oksidacija mravlje kiseline na platinskim katalizatorima na ugljeničnom nosaču sa preferencijalno orijentisanim ravnima",
pages = "208-203",
number = "2",
volume = "70",
doi = "10.5937/tehnika1502203K"
}

Krstajić, M., Stevanović, S., Rogan, J., Gojković, S. Lj.,& Jovanović, V. M.. (2015). Formic acid electrooxidation on carbon supported platinum catalyst with preferential plane orientation. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 70(2), 203-208.
https://doi.org/10.5937/tehnika1502203K

Krstajić M, Stevanović S, Rogan J, Gojković SL, Jovanović VM. Formic acid electrooxidation on carbon supported platinum catalyst with preferential plane orientation. in Tehnika. 2015;70(2):203-208.
doi:10.5937/tehnika1502203K .

Krstajić, Mila, Stevanović, Sanja, Rogan, Jelena, Gojković, Snežana Lj., Jovanović, Vladislava M., "Formic acid electrooxidation on carbon supported platinum catalyst with preferential plane orientation" in Tehnika, 70, no. 2 (2015):203-208,
https://doi.org/10.5937/tehnika1502203K . .

TY  - JOUR
AU  - Mladenović, Aleksandar R.
AU  - Mijin, Dušan
AU  - Drmanić, Saša
AU  - Vajs, Vlatka
AU  - Jovanović, Vladislava M.
AU  - Petrović, Slobodan
AU  - Avramov-Ivić, Milka
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2820
AB  - The oxidative ability of donepezil, a frequently prescribed drug for the treatment of Alzheimer's disease is reported for the first time at a gold electrode. It was oxidized by cyclic voltammetry and determined by square wave voltammetry in phosphate buffer electrolyte. Electrochemical degradation of donepezil was carried out by long term potential cycling. The identification and characterization of the major product, isolated by preparative high performance liquid chromatography, was performed by high resolution mass spectrometry and 1D and 2D nuclear magnetic resonance spectroscopy. Donepezil hydroxy derivative was identified as the major electrochemical oxidation product from donepezil.
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Electroanalysis
T1  - Electrochemical Oxidation of Donepezil and Its Voltammetric Determination at Gold Electrode
EP  - 897
IS  - 5
SP  - 893
VL  - 26
DO  - 10.1002/elan.201400034
ER  - 

@article{
author = "Mladenović, Aleksandar R. and Mijin, Dušan and Drmanić, Saša and Vajs, Vlatka and Jovanović, Vladislava M. and Petrović, Slobodan and Avramov-Ivić, Milka",
year = "2014",
abstract = "The oxidative ability of donepezil, a frequently prescribed drug for the treatment of Alzheimer's disease is reported for the first time at a gold electrode. It was oxidized by cyclic voltammetry and determined by square wave voltammetry in phosphate buffer electrolyte. Electrochemical degradation of donepezil was carried out by long term potential cycling. The identification and characterization of the major product, isolated by preparative high performance liquid chromatography, was performed by high resolution mass spectrometry and 1D and 2D nuclear magnetic resonance spectroscopy. Donepezil hydroxy derivative was identified as the major electrochemical oxidation product from donepezil.",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Electroanalysis",
title = "Electrochemical Oxidation of Donepezil and Its Voltammetric Determination at Gold Electrode",
pages = "897-893",
number = "5",
volume = "26",
doi = "10.1002/elan.201400034"
}

Mladenović, A. R., Mijin, D., Drmanić, S., Vajs, V., Jovanović, V. M., Petrović, S.,& Avramov-Ivić, M.. (2014). Electrochemical Oxidation of Donepezil and Its Voltammetric Determination at Gold Electrode. in Electroanalysis
Wiley-VCH Verlag Gmbh, Weinheim., 26(5), 893-897.
https://doi.org/10.1002/elan.201400034

Mladenović AR, Mijin D, Drmanić S, Vajs V, Jovanović VM, Petrović S, Avramov-Ivić M. Electrochemical Oxidation of Donepezil and Its Voltammetric Determination at Gold Electrode. in Electroanalysis. 2014;26(5):893-897.
doi:10.1002/elan.201400034 .

Mladenović, Aleksandar R., Mijin, Dušan, Drmanić, Saša, Vajs, Vlatka, Jovanović, Vladislava M., Petrović, Slobodan, Avramov-Ivić, Milka, "Electrochemical Oxidation of Donepezil and Its Voltammetric Determination at Gold Electrode" in Electroanalysis, 26, no. 5 (2014):893-897,
https://doi.org/10.1002/elan.201400034 . .

TY  - JOUR
AU  - Nevešćanin, Marina
AU  - Avramov-Ivić, Milka
AU  - Petrović, Slobodan
AU  - Mijin, Dušan
AU  - Stević-Banović, Sonja N.
AU  - Jovanović, Vladislava M.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2358
AB  - The catalytic abilities of a gold electrode were tested for the quantitative determination of amphetamine (A) and 3,4-methylenedioxy-N-methylamphetamine (MDMA) standards by their oxidation using cyclic voltammetry (CV). The values of the oxidative currents of A and MDMA standards at 0.80 V vs. SCE in 0.05 M NaHCO3 at a scan rate of 50 mV s-1 were linear functions of the concentration in range of 110.9-258.9 μM and 38.7-229.2 μM, respectively. Square wave voltammetry (SWV) revealed a linear increase of current with the concentration of MDMA (range 30.9-91.6 μM), which enabled the quantitative determination of amphetamine derivates. SWV analysis was also successfully performed in spiked urine samples. A and MDMA in the presence of sucrose and as a content in illegally produced tablets were also determined. The voltammetric determinations of A and MDMA derivatives using CV and SWV at gold a electrode are rapid, selective and simple procedures and their accuracy was confirmed with a reference method, high performance liquid chromatography (HPLC). The analysis of spiked urine samples offers an additional possibility for the rapid detection of A and MDMA in human urine.
AB  - Katalitička svojstva elektrode od zlata su testirana za kvantitativno određivanje amfetamina (A) i 3,4-metilendioksi-N-metilamfetamina (MDMA) standarda. Elektroksidacija A i MDMA je praćena cikličnom voltametrijom (CV). Vrednost oksidativnog pika A i MDMA standarda je linearna funkcija koncentracija u opsegu 110,9-258,9 μM (A) i 38,7-229,2 μM (MDMA). Voltametrija sa pravougaonim impulsima (SWV) je pokazala linearnu zavisnost struja od koncentracija za MDMA standard (u opsegu: 30,9-91,6 μM) kao i u spajkovanim uzorcima humanog urina. Uspešno je analiziran i sadržaj A i MDMA u ilegalno proizvedenim tabletama. Voltametrijsko određivanje A i MDMA derivata uz pomoć CV i SWV na elektrodi od zlata je brza, selektivna i jednostavna procedura. Analiza spajkovanih uzoraka urina nudi dodatnu mogućnost za brzu detekciju A i MDMA u humanom urinu.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - The use of a gold electrode for the determination of amphetamine derivatives and application to their analysis in human urine
T1  - Određivanje derivata amfetamina i primena u analizi humanog urina na elektrodi od zlata
EP  - 1385
IS  - 9
SP  - 1373
VL  - 78
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2358
ER  - 

@article{
author = "Nevešćanin, Marina and Avramov-Ivić, Milka and Petrović, Slobodan and Mijin, Dušan and Stević-Banović, Sonja N. and Jovanović, Vladislava M.",
year = "2013",
abstract = "The catalytic abilities of a gold electrode were tested for the quantitative determination of amphetamine (A) and 3,4-methylenedioxy-N-methylamphetamine (MDMA) standards by their oxidation using cyclic voltammetry (CV). The values of the oxidative currents of A and MDMA standards at 0.80 V vs. SCE in 0.05 M NaHCO3 at a scan rate of 50 mV s-1 were linear functions of the concentration in range of 110.9-258.9 μM and 38.7-229.2 μM, respectively. Square wave voltammetry (SWV) revealed a linear increase of current with the concentration of MDMA (range 30.9-91.6 μM), which enabled the quantitative determination of amphetamine derivates. SWV analysis was also successfully performed in spiked urine samples. A and MDMA in the presence of sucrose and as a content in illegally produced tablets were also determined. The voltammetric determinations of A and MDMA derivatives using CV and SWV at gold a electrode are rapid, selective and simple procedures and their accuracy was confirmed with a reference method, high performance liquid chromatography (HPLC). The analysis of spiked urine samples offers an additional possibility for the rapid detection of A and MDMA in human urine., Katalitička svojstva elektrode od zlata su testirana za kvantitativno određivanje amfetamina (A) i 3,4-metilendioksi-N-metilamfetamina (MDMA) standarda. Elektroksidacija A i MDMA je praćena cikličnom voltametrijom (CV). Vrednost oksidativnog pika A i MDMA standarda je linearna funkcija koncentracija u opsegu 110,9-258,9 μM (A) i 38,7-229,2 μM (MDMA). Voltametrija sa pravougaonim impulsima (SWV) je pokazala linearnu zavisnost struja od koncentracija za MDMA standard (u opsegu: 30,9-91,6 μM) kao i u spajkovanim uzorcima humanog urina. Uspešno je analiziran i sadržaj A i MDMA u ilegalno proizvedenim tabletama. Voltametrijsko određivanje A i MDMA derivata uz pomoć CV i SWV na elektrodi od zlata je brza, selektivna i jednostavna procedura. Analiza spajkovanih uzoraka urina nudi dodatnu mogućnost za brzu detekciju A i MDMA u humanom urinu.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "The use of a gold electrode for the determination of amphetamine derivatives and application to their analysis in human urine, Određivanje derivata amfetamina i primena u analizi humanog urina na elektrodi od zlata",
pages = "1385-1373",
number = "9",
volume = "78",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2358"
}

Nevešćanin, M., Avramov-Ivić, M., Petrović, S., Mijin, D., Stević-Banović, S. N.,& Jovanović, V. M.. (2013). The use of a gold electrode for the determination of amphetamine derivatives and application to their analysis in human urine. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 78(9), 1373-1385.
https://hdl.handle.net/21.15107/rcub_technorep_2358

Nevešćanin M, Avramov-Ivić M, Petrović S, Mijin D, Stević-Banović SN, Jovanović VM. The use of a gold electrode for the determination of amphetamine derivatives and application to their analysis in human urine. in Journal of the Serbian Chemical Society. 2013;78(9):1373-1385.
https://hdl.handle.net/21.15107/rcub_technorep_2358 .

Nevešćanin, Marina, Avramov-Ivić, Milka, Petrović, Slobodan, Mijin, Dušan, Stević-Banović, Sonja N., Jovanović, Vladislava M., "The use of a gold electrode for the determination of amphetamine derivatives and application to their analysis in human urine" in Journal of the Serbian Chemical Society, 78, no. 9 (2013):1373-1385,
https://hdl.handle.net/21.15107/rcub_technorep_2358 .

TY  - JOUR
AU  - Mladenović, Aleksandar R.
AU  - Jovanović, Vladislava M.
AU  - Petrović, Slobodan
AU  - Mijin, Dušan
AU  - Drmanić, Saša
AU  - Avramov-Ivić, Milka
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2351
AB  - The determination of clopidogrel, an antiplatelet agent, was performed at a gold electrode in pH 3.7 acetate buffer using cyclic voltammetry (CV) and square wave voltammetry (SWV). Each voltammogram was characterized by the well defined peak at approximately 1.0 V. The current of anodic stripping peak exhibited a linear dependence on the clopidogrel concentration in the range from 317.89 to 935.16 μg cm-3. The obtained linearity was applied to determine clopidogrel in the tablet form of the pharmaceutical preparation (Plavix®). The results were compared to the UV spectrophotometric and HPLC methods. .
AB  - Klopidogrel je antitrombotski agens iz tijenopiridinske klase, koji se koristi za inhibiranje formiranja krvnih ugrušaka pri lečenju koronarne arterijske bolesti, periferne vaskularne bolesti, i cerebrovaskularne bolesti. Elektrohemijsko ponašanje klopidogrel standarda i kao sastojka tablete Plavix® je definisano cikličnom voltametrijom. Njihovo kvantitativno određivanje na elektrodi od zlata u acetatnom puferu, pH 3,7, urađeno je voltametrijom sa pravougaonim impulsima (SWV). Pokazano je obema tehnikama da je svaki voltamogram okarakterisan dobro definisanim strujnim vrhom na 1,0 V. Na osnovu linearne zavisnosti anodnih struja od koncentracije klopidogrel standarda određena je masa klopidogrela u Plavix® tableti. Dobijeni rezultati pokazuju da SWV tehnika može biti korišćena direktno, brzo i jednostavno za određivanje klopidogrela u tabletama. Rezultati dobijeni SWV voltametrijskom tehnikom su poređeni sa rezultatima analize klopidogrela UV spektrofotometrijom i tečnom hromatografijom sa visokim performansama. Analitički rezultati pokazuju da je masa aktivne supstance u tabletama Plavix® u okviru limita specifikovanog farmakopejom. To ukazuje da voltametrija sa pravougaonim impulsima može biti uspešna alternativa hromatografskim i spektrofotometrijskim metodama. .
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Determination of clopidogrel using square wave voltammetry at a gold electrode
T1  - Određivanje klopidogrela voltametrijom sa pravouglim impulsima na elektrodi od zlata
EP  - 2140
IS  - 12
SP  - 2131
VL  - 78
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2351
ER  - 

@article{
author = "Mladenović, Aleksandar R. and Jovanović, Vladislava M. and Petrović, Slobodan and Mijin, Dušan and Drmanić, Saša and Avramov-Ivić, Milka",
year = "2013",
abstract = "The determination of clopidogrel, an antiplatelet agent, was performed at a gold electrode in pH 3.7 acetate buffer using cyclic voltammetry (CV) and square wave voltammetry (SWV). Each voltammogram was characterized by the well defined peak at approximately 1.0 V. The current of anodic stripping peak exhibited a linear dependence on the clopidogrel concentration in the range from 317.89 to 935.16 μg cm-3. The obtained linearity was applied to determine clopidogrel in the tablet form of the pharmaceutical preparation (Plavix®). The results were compared to the UV spectrophotometric and HPLC methods. ., Klopidogrel je antitrombotski agens iz tijenopiridinske klase, koji se koristi za inhibiranje formiranja krvnih ugrušaka pri lečenju koronarne arterijske bolesti, periferne vaskularne bolesti, i cerebrovaskularne bolesti. Elektrohemijsko ponašanje klopidogrel standarda i kao sastojka tablete Plavix® je definisano cikličnom voltametrijom. Njihovo kvantitativno određivanje na elektrodi od zlata u acetatnom puferu, pH 3,7, urađeno je voltametrijom sa pravougaonim impulsima (SWV). Pokazano je obema tehnikama da je svaki voltamogram okarakterisan dobro definisanim strujnim vrhom na 1,0 V. Na osnovu linearne zavisnosti anodnih struja od koncentracije klopidogrel standarda određena je masa klopidogrela u Plavix® tableti. Dobijeni rezultati pokazuju da SWV tehnika može biti korišćena direktno, brzo i jednostavno za određivanje klopidogrela u tabletama. Rezultati dobijeni SWV voltametrijskom tehnikom su poređeni sa rezultatima analize klopidogrela UV spektrofotometrijom i tečnom hromatografijom sa visokim performansama. Analitički rezultati pokazuju da je masa aktivne supstance u tabletama Plavix® u okviru limita specifikovanog farmakopejom. To ukazuje da voltametrija sa pravougaonim impulsima može biti uspešna alternativa hromatografskim i spektrofotometrijskim metodama. .",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Determination of clopidogrel using square wave voltammetry at a gold electrode, Određivanje klopidogrela voltametrijom sa pravouglim impulsima na elektrodi od zlata",
pages = "2140-2131",
number = "12",
volume = "78",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2351"
}

Mladenović, A. R., Jovanović, V. M., Petrović, S., Mijin, D., Drmanić, S.,& Avramov-Ivić, M.. (2013). Determination of clopidogrel using square wave voltammetry at a gold electrode. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 78(12), 2131-2140.
https://hdl.handle.net/21.15107/rcub_technorep_2351

Mladenović AR, Jovanović VM, Petrović S, Mijin D, Drmanić S, Avramov-Ivić M. Determination of clopidogrel using square wave voltammetry at a gold electrode. in Journal of the Serbian Chemical Society. 2013;78(12):2131-2140.
https://hdl.handle.net/21.15107/rcub_technorep_2351 .

Mladenović, Aleksandar R., Jovanović, Vladislava M., Petrović, Slobodan, Mijin, Dušan, Drmanić, Saša, Avramov-Ivić, Milka, "Determination of clopidogrel using square wave voltammetry at a gold electrode" in Journal of the Serbian Chemical Society, 78, no. 12 (2013):2131-2140,
https://hdl.handle.net/21.15107/rcub_technorep_2351 .

TY  - JOUR
AU  - Stoiljković, Zora Ž.
AU  - Jovanović, Vladislava M.
AU  - Mijin, Dušan
AU  - Nikolić, V.
AU  - Nikolić, Ljubiša B.
AU  - Petrović, Slobodan
AU  - Avramov-Ivić, Milka
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2259
AB  - The electrochemical behavior of inclusion complexes of nifedipine (Nif) and amlodipine (Aml), a long-acting calcium channel blockers dihydropyridine (DHP) class, with beta-cyclodextrin (beta CD) and (2-hydroxypropyl)-beta-cyclodextrin (HP beta CD), is examined using cyclic and square wave voltammetry in 0.05 M NaHCO3 and phosphate buffer (pH=11) on a gold electrode. The voltammograms show a single irreversible anodic wave with the current controlled by adsorption. It was found that phosphate buffer favorites the electrochemical activity of both complexes of Nif with the linear dependency of the oxidative currents on their concentrations. In phosphate buffer, only HP beta CD-Aml complex showed linear dependency of the oxidative currents on the concentration. In 0.05 M NaHCO3 as electrolyte only HP beta CD-Nif exhibited apparent activity. The initial potential of the anodic reaction as well as the value of the potential for anodic currents maximum of all the examined complexes in both electrolytes were shifted to the positive direction compared to their standards. In addition, the value of anodic currents decreased.
PB  - Electrochemical Science Group, Beograd
T2  - International Journal of Electrochemical Science
T1  - The Electrochemical Investigation of Inclusion Complexes of Nifedipine and Amlodipine with beta-Cyclodextrin and (2-Hydroxypropyl)-beta-Cyclodextrin
EP  - 9557
IS  - 7
SP  - 9543
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2259
ER  - 

@article{
author = "Stoiljković, Zora Ž. and Jovanović, Vladislava M. and Mijin, Dušan and Nikolić, V. and Nikolić, Ljubiša B. and Petrović, Slobodan and Avramov-Ivić, Milka",
year = "2013",
abstract = "The electrochemical behavior of inclusion complexes of nifedipine (Nif) and amlodipine (Aml), a long-acting calcium channel blockers dihydropyridine (DHP) class, with beta-cyclodextrin (beta CD) and (2-hydroxypropyl)-beta-cyclodextrin (HP beta CD), is examined using cyclic and square wave voltammetry in 0.05 M NaHCO3 and phosphate buffer (pH=11) on a gold electrode. The voltammograms show a single irreversible anodic wave with the current controlled by adsorption. It was found that phosphate buffer favorites the electrochemical activity of both complexes of Nif with the linear dependency of the oxidative currents on their concentrations. In phosphate buffer, only HP beta CD-Aml complex showed linear dependency of the oxidative currents on the concentration. In 0.05 M NaHCO3 as electrolyte only HP beta CD-Nif exhibited apparent activity. The initial potential of the anodic reaction as well as the value of the potential for anodic currents maximum of all the examined complexes in both electrolytes were shifted to the positive direction compared to their standards. In addition, the value of anodic currents decreased.",
publisher = "Electrochemical Science Group, Beograd",
journal = "International Journal of Electrochemical Science",
title = "The Electrochemical Investigation of Inclusion Complexes of Nifedipine and Amlodipine with beta-Cyclodextrin and (2-Hydroxypropyl)-beta-Cyclodextrin",
pages = "9557-9543",
number = "7",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2259"
}

Stoiljković, Z. Ž., Jovanović, V. M., Mijin, D., Nikolić, V., Nikolić, L. B., Petrović, S.,& Avramov-Ivić, M.. (2013). The Electrochemical Investigation of Inclusion Complexes of Nifedipine and Amlodipine with beta-Cyclodextrin and (2-Hydroxypropyl)-beta-Cyclodextrin. in International Journal of Electrochemical Science
Electrochemical Science Group, Beograd., 8(7), 9543-9557.
https://hdl.handle.net/21.15107/rcub_technorep_2259

Stoiljković ZŽ, Jovanović VM, Mijin D, Nikolić V, Nikolić LB, Petrović S, Avramov-Ivić M. The Electrochemical Investigation of Inclusion Complexes of Nifedipine and Amlodipine with beta-Cyclodextrin and (2-Hydroxypropyl)-beta-Cyclodextrin. in International Journal of Electrochemical Science. 2013;8(7):9543-9557.
https://hdl.handle.net/21.15107/rcub_technorep_2259 .

Stoiljković, Zora Ž., Jovanović, Vladislava M., Mijin, Dušan, Nikolić, V., Nikolić, Ljubiša B., Petrović, Slobodan, Avramov-Ivić, Milka, "The Electrochemical Investigation of Inclusion Complexes of Nifedipine and Amlodipine with beta-Cyclodextrin and (2-Hydroxypropyl)-beta-Cyclodextrin" in International Journal of Electrochemical Science, 8, no. 7 (2013):9543-9557,
https://hdl.handle.net/21.15107/rcub_technorep_2259 .

TY  - JOUR
AU  - Lović, Jelena
AU  - Obradović, Maja
AU  - Tripković, Dušan
AU  - Popović, Ksenija
AU  - Jovanović, Vladislava M.
AU  - Gojković, Snežana Lj.
AU  - Tripković, Amalija
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2148
AB  - Formic acid oxidation was studied on a new prepared Pt2Bi characterized by X-ray diffraction spectroscopy (phase composition), scanning tunneling microscopy (STM) (surface morphology), and COads stripping voltammetry (surface composition). Bulk composition of Pt2Bi revealed two phases-55% PtBi alloy and 45% Pt. Estimated contribution of pure Pt on the Pt2Bi surface (43.5%) determined by COads stripping voltammetry corresponds closely to bulk composition. Pt2Bi reveals high activity and stability in formic acid oxidation. High activity originates from the fact that formic acid oxidation proceeds completely through dehydrogenation path based on an ensemble effect. The high stability of Pt2Bi surface is induced by the suppression of Bi leaching as it was evidenced by insignificant changes of surface morphology and surface roughness shown by STM images before and after electrochemical treatment in formic acid containing solution. Pt2Bi is found to be powerful catalyst exhibiting up to two orders of magnitude larger current densities at 0.0 V and onset potential shifted for similar to 0.2 V to more negative value relative to Pt under steady-state condition.
PB  - Springer, New York
T2  - Electrocatalysis
T1  - High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation
EP  - 352
IS  - 3-4
SP  - 346
VL  - 3
DO  - 10.1007/s12678-012-0099-9
ER  - 

@article{
author = "Lović, Jelena and Obradović, Maja and Tripković, Dušan and Popović, Ksenija and Jovanović, Vladislava M. and Gojković, Snežana Lj. and Tripković, Amalija",
year = "2012",
abstract = "Formic acid oxidation was studied on a new prepared Pt2Bi characterized by X-ray diffraction spectroscopy (phase composition), scanning tunneling microscopy (STM) (surface morphology), and COads stripping voltammetry (surface composition). Bulk composition of Pt2Bi revealed two phases-55% PtBi alloy and 45% Pt. Estimated contribution of pure Pt on the Pt2Bi surface (43.5%) determined by COads stripping voltammetry corresponds closely to bulk composition. Pt2Bi reveals high activity and stability in formic acid oxidation. High activity originates from the fact that formic acid oxidation proceeds completely through dehydrogenation path based on an ensemble effect. The high stability of Pt2Bi surface is induced by the suppression of Bi leaching as it was evidenced by insignificant changes of surface morphology and surface roughness shown by STM images before and after electrochemical treatment in formic acid containing solution. Pt2Bi is found to be powerful catalyst exhibiting up to two orders of magnitude larger current densities at 0.0 V and onset potential shifted for similar to 0.2 V to more negative value relative to Pt under steady-state condition.",
publisher = "Springer, New York",
journal = "Electrocatalysis",
title = "High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation",
pages = "352-346",
number = "3-4",
volume = "3",
doi = "10.1007/s12678-012-0099-9"
}

Lović, J., Obradović, M., Tripković, D., Popović, K., Jovanović, V. M., Gojković, S. Lj.,& Tripković, A.. (2012). High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation. in Electrocatalysis
Springer, New York., 3(3-4), 346-352.
https://doi.org/10.1007/s12678-012-0099-9

Lović J, Obradović M, Tripković D, Popović K, Jovanović VM, Gojković SL, Tripković A. High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation. in Electrocatalysis. 2012;3(3-4):346-352.
doi:10.1007/s12678-012-0099-9 .

Lović, Jelena, Obradović, Maja, Tripković, Dušan, Popović, Ksenija, Jovanović, Vladislava M., Gojković, Snežana Lj., Tripković, Amalija, "High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation" in Electrocatalysis, 3, no. 3-4 (2012):346-352,
https://doi.org/10.1007/s12678-012-0099-9 . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Rogan, Jelena
AU  - Popović, Ksenija
AU  - Lović, Jelena
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2173
AB  - High surface area carbon-supported Pt, PtRh, and PtSn catalysts were synthesized by microwave-assisted polyol procedure and tested for ethanol oxidation in perchloric acid. The catalysts were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning tunnelling microscopy (STM), TEM, and EDX techniques. STM analysis of unsupported catalysts shows that small particles (similar to 2 nm) with a narrow size distribution are obtained. TEM and XRD examinations of supported catalysts revealed an increase in particle size upon deposition on carbon support (diameter similar to aEuro parts per thousand 3 nm). The diffraction peaks of the bimetallic catalysts in X-ray diffraction patterns are slightly shifted to lower (PtSn/C) or higher (PtRh/C) 2 theta values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation. Oxidation of ethanol is significantly improved at PtSn/C with the onset potential shifted for similar to aEuro parts per thousand 150 mV to more negative values and the increase of activity for approximately three times in comparison to Pt/C catalyst. This is the lowest onset potential found for ethanol oxidation at PtSn catalysts with a similar composition. Chronoamperometric measurements confirmed that PtSn/C is notably less poisoned than Pt/C catalyst. PtRh/C catalyst exhibited mild enhancement of overall electrochemical reaction in comparison to Pt/C.
PB  - Springer, New York
T2  - Journal of Solid State Electrochemistry
T1  - Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation
EP  - 3157
IS  - 10
SP  - 3147
VL  - 16
DO  - 10.1007/s10008-012-1755-y
ER  - 

@article{
author = "Stevanović, Sanja and Tripković, Dušan and Rogan, Jelena and Popović, Ksenija and Lović, Jelena and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2012",
abstract = "High surface area carbon-supported Pt, PtRh, and PtSn catalysts were synthesized by microwave-assisted polyol procedure and tested for ethanol oxidation in perchloric acid. The catalysts were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning tunnelling microscopy (STM), TEM, and EDX techniques. STM analysis of unsupported catalysts shows that small particles (similar to 2 nm) with a narrow size distribution are obtained. TEM and XRD examinations of supported catalysts revealed an increase in particle size upon deposition on carbon support (diameter similar to aEuro parts per thousand 3 nm). The diffraction peaks of the bimetallic catalysts in X-ray diffraction patterns are slightly shifted to lower (PtSn/C) or higher (PtRh/C) 2 theta values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation. Oxidation of ethanol is significantly improved at PtSn/C with the onset potential shifted for similar to aEuro parts per thousand 150 mV to more negative values and the increase of activity for approximately three times in comparison to Pt/C catalyst. This is the lowest onset potential found for ethanol oxidation at PtSn catalysts with a similar composition. Chronoamperometric measurements confirmed that PtSn/C is notably less poisoned than Pt/C catalyst. PtRh/C catalyst exhibited mild enhancement of overall electrochemical reaction in comparison to Pt/C.",
publisher = "Springer, New York",
journal = "Journal of Solid State Electrochemistry",
title = "Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation",
pages = "3157-3147",
number = "10",
volume = "16",
doi = "10.1007/s10008-012-1755-y"
}

Stevanović, S., Tripković, D., Rogan, J., Popović, K., Lović, J., Tripković, A.,& Jovanović, V. M.. (2012). Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation. in Journal of Solid State Electrochemistry
Springer, New York., 16(10), 3147-3157.
https://doi.org/10.1007/s10008-012-1755-y

Stevanović S, Tripković D, Rogan J, Popović K, Lović J, Tripković A, Jovanović VM. Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation. in Journal of Solid State Electrochemistry. 2012;16(10):3147-3157.
doi:10.1007/s10008-012-1755-y .

Stevanović, Sanja, Tripković, Dušan, Rogan, Jelena, Popović, Ksenija, Lović, Jelena, Tripković, Amalija, Jovanović, Vladislava M., "Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation" in Journal of Solid State Electrochemistry, 16, no. 10 (2012):3147-3157,
https://doi.org/10.1007/s10008-012-1755-y . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Poleti, Dejan
AU  - Rogan, Jelena
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1798
AB  - Carbon-supported Pt and Pt-Rh-Sn catalysts were synthesized by the microwave-polyol method in ethylene glycol solution and were investigated in the ethanol electro-oxidation reaction. The catalysts were characterized in terms of structure, morphology and composition employing the X-ray diffraction (XRD), scanning tunneling microscopy and energy-dispersive X-ray spectroscopy techniques. The STM analysis indicated rather uniform particles and particle sizes below 2 nm for both catalysts. The XRD analysis of the Pt/C catalyst revealed two phases, one with the main characteristic peaks of the face-centered cubic crystal structure (fcc) of platinum and the other related to the graphite-like structure of the carbon support, Vulcan XC-72R. However, in the XRD pattern of the Pt-Rh-Sn/C catalyst, diffraction peaks for Pt, Rh or Sn could not be resolved, indicating extremely low crystallinity. The small particle sizes and homogeneous size distributions of both catalysts could be attributed to the advantages of the microwave-assisted modified polyol process in ethylene glycol solution. The Pt-Rh-Sn/C catalyst was highly active for ethanol oxidation with the onset potential shifted by more than 150 mV to more negative values and with currents nearly 5 times higher in comparison to the Pt/C catalyst. The stability tests of the catalysts, as studied by chronoamperometric experiments, revealed that the Pt-Rh-Sn/C catalyst was evidently less poisoned than the Pt/C catalyst. The increased activity of Pt-Rh-Sn/C in comparison to Pt/C catalyst was most probably promoted by the bi-functional mechanism and the electronic effect of the alloyed metals.
AB  - Pt i Pt-Rh-Sn katalizatori na ugljeniku razvijene površine su sintetizovani poliol-mikrotalasnim postupkom u rastvoru etilenglikola i ispitivani za reakciju eletrohemijske oksidacije etanola u kiseloj sredini. Katalizatori su okarakterisani strukturno, morfološki i po sastavu korišćenjem XRD, STM i EDX tehnika. STM analiza je potvrdila da su Pt i Pt-Rh-Sn čestice uniformne veličine i prečnika manjeg od 2 nm. XRD analiza Pt/C katalizatora pokazala je prisustvo dve faze, jedne sa glavnim karakterističnim pikovima za pljosno-centriranu kubnu kristalnu strukturu platine (111, 200, 220 i 311) i druge sa difrakcionim pikom na 2q oko 25° karakterističnim za heksagonalnu strukturu vulkana XC-72R (ugljeničnog nosača). XRD analiza Pt-Rh-Sn/C katalizatora nije pokazala karakteristične pikove, što je indikacija veoma male kristaličnosti katalizatora. Aktivnost katalizatora ispitivana je potenciodinamičkim i hronoamperometrijskim merenjima. Pt-Rh-Sn/C katalizator je veoma aktivan za oksidaciju etanola sa početkom reakcije na potencijalima za oko 150 mV pomerenim ka negativnijim vrednostima i strujama koje su oko pet puta veće u poređenju sa Pt/C katalizatorom. Stabilnost katalizatora ispitivana hronoamperometrijski pokazala je da se Pt-Rh-Sn/C katalizator manje truje od Pt/C katalizatora. Mala veličina i homogena distribucija čestica mogu se pripisati prednostima mikrotalasne sinteze i modifikovanog poliol postupka u rastvoru etilenglikola. Veća aktivnost Pt-Rh-Sn/C katalizatora u poređenju sa Pt/C katalizatorom posledica je bi-funkcionalnog mehanizma i elektronskog (ligand) efekta metala u sintetizovanoj leguri.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation
T1  - Mikrotalasna sinteza i karakterizacija Pt i Pt-Rh-Sn katalizatora za oksidaciju etanola
EP  - 1685
IS  - 12
SP  - 1673
VL  - 76
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1798
ER  - 

@article{
author = "Stevanović, Sanja and Tripković, Dušan and Poleti, Dejan and Rogan, Jelena and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2011",
abstract = "Carbon-supported Pt and Pt-Rh-Sn catalysts were synthesized by the microwave-polyol method in ethylene glycol solution and were investigated in the ethanol electro-oxidation reaction. The catalysts were characterized in terms of structure, morphology and composition employing the X-ray diffraction (XRD), scanning tunneling microscopy and energy-dispersive X-ray spectroscopy techniques. The STM analysis indicated rather uniform particles and particle sizes below 2 nm for both catalysts. The XRD analysis of the Pt/C catalyst revealed two phases, one with the main characteristic peaks of the face-centered cubic crystal structure (fcc) of platinum and the other related to the graphite-like structure of the carbon support, Vulcan XC-72R. However, in the XRD pattern of the Pt-Rh-Sn/C catalyst, diffraction peaks for Pt, Rh or Sn could not be resolved, indicating extremely low crystallinity. The small particle sizes and homogeneous size distributions of both catalysts could be attributed to the advantages of the microwave-assisted modified polyol process in ethylene glycol solution. The Pt-Rh-Sn/C catalyst was highly active for ethanol oxidation with the onset potential shifted by more than 150 mV to more negative values and with currents nearly 5 times higher in comparison to the Pt/C catalyst. The stability tests of the catalysts, as studied by chronoamperometric experiments, revealed that the Pt-Rh-Sn/C catalyst was evidently less poisoned than the Pt/C catalyst. The increased activity of Pt-Rh-Sn/C in comparison to Pt/C catalyst was most probably promoted by the bi-functional mechanism and the electronic effect of the alloyed metals., Pt i Pt-Rh-Sn katalizatori na ugljeniku razvijene površine su sintetizovani poliol-mikrotalasnim postupkom u rastvoru etilenglikola i ispitivani za reakciju eletrohemijske oksidacije etanola u kiseloj sredini. Katalizatori su okarakterisani strukturno, morfološki i po sastavu korišćenjem XRD, STM i EDX tehnika. STM analiza je potvrdila da su Pt i Pt-Rh-Sn čestice uniformne veličine i prečnika manjeg od 2 nm. XRD analiza Pt/C katalizatora pokazala je prisustvo dve faze, jedne sa glavnim karakterističnim pikovima za pljosno-centriranu kubnu kristalnu strukturu platine (111, 200, 220 i 311) i druge sa difrakcionim pikom na 2q oko 25° karakterističnim za heksagonalnu strukturu vulkana XC-72R (ugljeničnog nosača). XRD analiza Pt-Rh-Sn/C katalizatora nije pokazala karakteristične pikove, što je indikacija veoma male kristaličnosti katalizatora. Aktivnost katalizatora ispitivana je potenciodinamičkim i hronoamperometrijskim merenjima. Pt-Rh-Sn/C katalizator je veoma aktivan za oksidaciju etanola sa početkom reakcije na potencijalima za oko 150 mV pomerenim ka negativnijim vrednostima i strujama koje su oko pet puta veće u poređenju sa Pt/C katalizatorom. Stabilnost katalizatora ispitivana hronoamperometrijski pokazala je da se Pt-Rh-Sn/C katalizator manje truje od Pt/C katalizatora. Mala veličina i homogena distribucija čestica mogu se pripisati prednostima mikrotalasne sinteze i modifikovanog poliol postupka u rastvoru etilenglikola. Veća aktivnost Pt-Rh-Sn/C katalizatora u poređenju sa Pt/C katalizatorom posledica je bi-funkcionalnog mehanizma i elektronskog (ligand) efekta metala u sintetizovanoj leguri.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation, Mikrotalasna sinteza i karakterizacija Pt i Pt-Rh-Sn katalizatora za oksidaciju etanola",
pages = "1685-1673",
number = "12",
volume = "76",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1798"
}

Stevanović, S., Tripković, D., Poleti, D., Rogan, J., Tripković, A.,& Jovanović, V. M.. (2011). Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 76(12), 1673-1685.
https://hdl.handle.net/21.15107/rcub_technorep_1798

Stevanović S, Tripković D, Poleti D, Rogan J, Tripković A, Jovanović VM. Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation. in Journal of the Serbian Chemical Society. 2011;76(12):1673-1685.
https://hdl.handle.net/21.15107/rcub_technorep_1798 .

Stevanović, Sanja, Tripković, Dušan, Poleti, Dejan, Rogan, Jelena, Tripković, Amalija, Jovanović, Vladislava M., "Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation" in Journal of the Serbian Chemical Society, 76, no. 12 (2011):1673-1685,
https://hdl.handle.net/21.15107/rcub_technorep_1798 .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Rogan, Jelena
AU  - Minić, Dragica M.
AU  - Gavrilović, Aleksandra
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1899
AB  - High surface area carbon supported Pt and Pt3Sn catalysts were synthesized by microwave irradiation and investigated in the ethanol electro-oxidation reaction. The catalysts were obtained using a modified polyol method in an ethylene glycol solution and were characterized in terms of structure, morphology and composition by employing XRD, STM and EDX techniques. The diffraction peaks of Pt3Sn/C catalyst in XRD patterns are shifted to lower 2 theta values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation between Pt and Sn. Particle size analysis from STM and XRD shows that Pt and Pt3Sn clusters are of a small diameter (similar to 2 nm) with a narrow size distribution. Pt3Sn/C catalyst is highly active in ethanol oxidation with the onset potential shifted for similar to 150 mV to more negative values and with similar to 2 times higher currents in comparison to Pt/C.
PB  - Maik Nauka/Interperiodica/Springer, New York
T2  - Russian Journal of Physical Chemistry A
T1  - Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation
EP  - 2304
IS  - 13
SP  - 2299
VL  - 85
DO  - 10.1134/S0036024411130309
ER  - 

@article{
author = "Stevanović, Sanja and Tripković, Dušan and Rogan, Jelena and Minić, Dragica M. and Gavrilović, Aleksandra and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2011",
abstract = "High surface area carbon supported Pt and Pt3Sn catalysts were synthesized by microwave irradiation and investigated in the ethanol electro-oxidation reaction. The catalysts were obtained using a modified polyol method in an ethylene glycol solution and were characterized in terms of structure, morphology and composition by employing XRD, STM and EDX techniques. The diffraction peaks of Pt3Sn/C catalyst in XRD patterns are shifted to lower 2 theta values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation between Pt and Sn. Particle size analysis from STM and XRD shows that Pt and Pt3Sn clusters are of a small diameter (similar to 2 nm) with a narrow size distribution. Pt3Sn/C catalyst is highly active in ethanol oxidation with the onset potential shifted for similar to 150 mV to more negative values and with similar to 2 times higher currents in comparison to Pt/C.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Russian Journal of Physical Chemistry A",
title = "Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation",
pages = "2304-2299",
number = "13",
volume = "85",
doi = "10.1134/S0036024411130309"
}

Stevanović, S., Tripković, D., Rogan, J., Minić, D. M., Gavrilović, A., Tripković, A.,& Jovanović, V. M.. (2011). Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation. in Russian Journal of Physical Chemistry A
Maik Nauka/Interperiodica/Springer, New York., 85(13), 2299-2304.
https://doi.org/10.1134/S0036024411130309

Stevanović S, Tripković D, Rogan J, Minić DM, Gavrilović A, Tripković A, Jovanović VM. Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation. in Russian Journal of Physical Chemistry A. 2011;85(13):2299-2304.
doi:10.1134/S0036024411130309 .

Stevanović, Sanja, Tripković, Dušan, Rogan, Jelena, Minić, Dragica M., Gavrilović, Aleksandra, Tripković, Amalija, Jovanović, Vladislava M., "Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation" in Russian Journal of Physical Chemistry A, 85, no. 13 (2011):2299-2304,
https://doi.org/10.1134/S0036024411130309 . .

TY  - JOUR
AU  - Miladinović, Jelena
AU  - Ninković, Rozalija
AU  - Todorović, Milica D.
AU  - Jovanović, Vladislava M.
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/519
AB  - The available literature data on the osmotic coefficient of ZnSO4(aq) at 25degreesC in the molality range from 0.1 to 4.3 mol-kg(-1) and new experimental data from 1.2 to 2.9 mol-kg(-1), at the same temperature, are presented. Selected values of the osmotic coefficient from all the data are analyzed using the Clegg-Pitzer-Brimblecombe model, the extended Pitzer model, and a semiempirical equation comprising a power series in molality added to the Debye-Huckel limiting law. The extended Pitzer equation and the Clegg-Pitzer-Brimblecombe equations give the best results in fitting the osmotic coefficient data. All three models are used to calculate ZnSO4 activity coefficients at 25degreesC in dilute solutions ( lt 0.1 mol-kg(-1)) for comparison with published values.
PB  - Kluwer Academic/Plenum Publ, New York
T2  - Journal of Solution Chemistry
T1  - Correlation of osmotic coefficient data for ZnSO4(aq) at 25 degrees C by various thermodynamic models
EP  - 383
IS  - 4
SP  - 371
VL  - 32
DO  - 10.1023/A:1023710022173
ER  - 

@article{
author = "Miladinović, Jelena and Ninković, Rozalija and Todorović, Milica D. and Jovanović, Vladislava M.",
year = "2003",
abstract = "The available literature data on the osmotic coefficient of ZnSO4(aq) at 25degreesC in the molality range from 0.1 to 4.3 mol-kg(-1) and new experimental data from 1.2 to 2.9 mol-kg(-1), at the same temperature, are presented. Selected values of the osmotic coefficient from all the data are analyzed using the Clegg-Pitzer-Brimblecombe model, the extended Pitzer model, and a semiempirical equation comprising a power series in molality added to the Debye-Huckel limiting law. The extended Pitzer equation and the Clegg-Pitzer-Brimblecombe equations give the best results in fitting the osmotic coefficient data. All three models are used to calculate ZnSO4 activity coefficients at 25degreesC in dilute solutions ( lt 0.1 mol-kg(-1)) for comparison with published values.",
publisher = "Kluwer Academic/Plenum Publ, New York",
journal = "Journal of Solution Chemistry",
title = "Correlation of osmotic coefficient data for ZnSO4(aq) at 25 degrees C by various thermodynamic models",
pages = "383-371",
number = "4",
volume = "32",
doi = "10.1023/A:1023710022173"
}

Miladinović, J., Ninković, R., Todorović, M. D.,& Jovanović, V. M.. (2003). Correlation of osmotic coefficient data for ZnSO4(aq) at 25 degrees C by various thermodynamic models. in Journal of Solution Chemistry
Kluwer Academic/Plenum Publ, New York., 32(4), 371-383.
https://doi.org/10.1023/A:1023710022173

Miladinović J, Ninković R, Todorović MD, Jovanović VM. Correlation of osmotic coefficient data for ZnSO4(aq) at 25 degrees C by various thermodynamic models. in Journal of Solution Chemistry. 2003;32(4):371-383.
doi:10.1023/A:1023710022173 .

Miladinović, Jelena, Ninković, Rozalija, Todorović, Milica D., Jovanović, Vladislava M., "Correlation of osmotic coefficient data for ZnSO4(aq) at 25 degrees C by various thermodynamic models" in Journal of Solution Chemistry, 32, no. 4 (2003):371-383,
https://doi.org/10.1023/A:1023710022173 . .