TY  - JOUR
AU  - Kalijadis, Ana
AU  - Gavrilov, Nemanja M.
AU  - Jokić, Bojan M.
AU  - Gilić, Martina
AU  - Krstić, Aleksandar D.
AU  - Pašti, Igor A.
AU  - Babić, Biljana M.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5887
AB  - Resorcinol–formaldehyde (RF) cryogels were synthesized by sol–gel polycondensation of resorcinol with formaldehyde and freeze-drying was carried out with t-butanol. Carbon cryogel (CC) was obtained by pyrolyzing RF cryogels in an inert atmosphere to 950 °C. Nitrogen doped CCs (CCN) were synthesized by introducing melamine into RF precursor mixture solution to obtain nitrogen concentration 2, 6 and 10 wt.%. Material was characterized by elemental analysis, nitrogen adsorption– desorption measurements, scanning electron microscopy (SEM), Raman spectroscopy, FT-IR Spectroscopy. Cyclic voltammetry (CV) was used to investigate capacitive and electrocatalytic properties. Conductivity measurement was also performed. Elemental analysis results confirmed presence of nitrogen in CCN samples in the range from 0.45 to 1.15 wt.%. Raman spectroscopy of the samples showed increase of D and G peak integrated intensity ratio (ID/IG) with nitrogen doping suggesting that the structural disorder as well as edge plane density increase, but according to similar ID/IG values for CCN samples, their share is not directly related to the amount of incorporated N. Characterization by nitrogen adsorption showed that overall specific surface and maximum mesopores are achieved in CCN sample with medium nitrogen concentration. Results of cyclic voltammetry experiments demonstrated maximum capacitance for CCN sample with smallest N wt.% indicating that narrow pore size distribution and high specific surface area are dominant factors to achieve good capacitive behavior. The relatively low doping level of nitrogen reached in CCN samples may be the reason for the incomplete reduction of oxygen to hydroxide and furthermore it turned out that presence of N in the structure of CC had a negligible effect on the otherwise relatively high conductivity of CC. © 2019 Elsevier B.V.
T2  - Materials Chemistry and Physics
T1  - Composition, structure and potential energy application of nitrogen doped carbon cryogels
SP  - 122120
VL  - 239
DO  - 10.1016/j.matchemphys.2019.122120
ER  - 

@article{
author = "Kalijadis, Ana and Gavrilov, Nemanja M. and Jokić, Bojan M. and Gilić, Martina and Krstić, Aleksandar D. and Pašti, Igor A. and Babić, Biljana M.",
year = "2020",
abstract = "Resorcinol–formaldehyde (RF) cryogels were synthesized by sol–gel polycondensation of resorcinol with formaldehyde and freeze-drying was carried out with t-butanol. Carbon cryogel (CC) was obtained by pyrolyzing RF cryogels in an inert atmosphere to 950 °C. Nitrogen doped CCs (CCN) were synthesized by introducing melamine into RF precursor mixture solution to obtain nitrogen concentration 2, 6 and 10 wt.%. Material was characterized by elemental analysis, nitrogen adsorption– desorption measurements, scanning electron microscopy (SEM), Raman spectroscopy, FT-IR Spectroscopy. Cyclic voltammetry (CV) was used to investigate capacitive and electrocatalytic properties. Conductivity measurement was also performed. Elemental analysis results confirmed presence of nitrogen in CCN samples in the range from 0.45 to 1.15 wt.%. Raman spectroscopy of the samples showed increase of D and G peak integrated intensity ratio (ID/IG) with nitrogen doping suggesting that the structural disorder as well as edge plane density increase, but according to similar ID/IG values for CCN samples, their share is not directly related to the amount of incorporated N. Characterization by nitrogen adsorption showed that overall specific surface and maximum mesopores are achieved in CCN sample with medium nitrogen concentration. Results of cyclic voltammetry experiments demonstrated maximum capacitance for CCN sample with smallest N wt.% indicating that narrow pore size distribution and high specific surface area are dominant factors to achieve good capacitive behavior. The relatively low doping level of nitrogen reached in CCN samples may be the reason for the incomplete reduction of oxygen to hydroxide and furthermore it turned out that presence of N in the structure of CC had a negligible effect on the otherwise relatively high conductivity of CC. © 2019 Elsevier B.V.",
journal = "Materials Chemistry and Physics",
title = "Composition, structure and potential energy application of nitrogen doped carbon cryogels",
pages = "122120",
volume = "239",
doi = "10.1016/j.matchemphys.2019.122120"
}

Kalijadis, A., Gavrilov, N. M., Jokić, B. M., Gilić, M., Krstić, A. D., Pašti, I. A.,& Babić, B. M.. (2020). Composition, structure and potential energy application of nitrogen doped carbon cryogels. in Materials Chemistry and Physics, 239, 122120.
https://doi.org/10.1016/j.matchemphys.2019.122120

Kalijadis A, Gavrilov NM, Jokić BM, Gilić M, Krstić AD, Pašti IA, Babić BM. Composition, structure and potential energy application of nitrogen doped carbon cryogels. in Materials Chemistry and Physics. 2020;239:122120.
doi:10.1016/j.matchemphys.2019.122120 .

Kalijadis, Ana, Gavrilov, Nemanja M., Jokić, Bojan M., Gilić, Martina, Krstić, Aleksandar D., Pašti, Igor A., Babić, Biljana M., "Composition, structure and potential energy application of nitrogen doped carbon cryogels" in Materials Chemistry and Physics, 239 (2020):122120,
https://doi.org/10.1016/j.matchemphys.2019.122120 . .

TY  - JOUR
AU  - Stojmenović, Marija
AU  - Momčilović, Milan Z.
AU  - Gavrilov, Nemanja M.
AU  - Pašti, Igor A.
AU  - Mentus, Slavko V.
AU  - Jokić, Bojan M.
AU  - Babić, Biljana M.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5776
AB  - Ordered mesoporous carbon, volume-doped up to 3w.% with Pt, Ru and Pt-Ru nanoparticles was synthesized by evaporation-induced self-assembly method, under acidic conditions. The content of incorporated metal was determined by EDX analysis. The X-ray diffractometry confirmed the existence of highly dispersed metallic phases in doped samples. Specific surface area was determined by N-2-physisorption measurements to range between 452 and 545m(2) g(-1). Raman spectroscopy of investigated materials indicated highly disordered carbon structure with crystallite sizes around 1.4 nm. In a form of thin-layer electrode on glassy carbon support, in 0.1M KOH solution, the prepared materials displayed high activity toward oxygen reduction reaction (ORR) in alkaline media, with onset potentials more positive than -0.10 V vs. SCE. The kinetics of O-2 reduction was found to be affected by both the specific surface area and the concentration of metal dopants. The ethanol tolerance of (Pt, Ru)-doped OMCs was found to be higher than that of common Pt/C ORR catalysts. Presented study provides a new route for the synthesis of active and selective ORR catalysts in alkaline media, being competitive with, or superior to, the existing ones in terms of performance and price. (C) 2014 Elsevier Ltd. All rights reserved.
T2  - Electrochimica Acta
T1  - Incorporation of Pt, Ru and Pt-Ru nanoparticles into ordered mesoporous carbons for efficient oxygen reduction reaction in alkaline media
EP  - 139
SP  - 130
VL  - 153
DO  - 10.1016/j.electacta.2014.11.080
ER  - 

@article{
author = "Stojmenović, Marija and Momčilović, Milan Z. and Gavrilov, Nemanja M. and Pašti, Igor A. and Mentus, Slavko V. and Jokić, Bojan M. and Babić, Biljana M.",
year = "2015",
abstract = "Ordered mesoporous carbon, volume-doped up to 3w.% with Pt, Ru and Pt-Ru nanoparticles was synthesized by evaporation-induced self-assembly method, under acidic conditions. The content of incorporated metal was determined by EDX analysis. The X-ray diffractometry confirmed the existence of highly dispersed metallic phases in doped samples. Specific surface area was determined by N-2-physisorption measurements to range between 452 and 545m(2) g(-1). Raman spectroscopy of investigated materials indicated highly disordered carbon structure with crystallite sizes around 1.4 nm. In a form of thin-layer electrode on glassy carbon support, in 0.1M KOH solution, the prepared materials displayed high activity toward oxygen reduction reaction (ORR) in alkaline media, with onset potentials more positive than -0.10 V vs. SCE. The kinetics of O-2 reduction was found to be affected by both the specific surface area and the concentration of metal dopants. The ethanol tolerance of (Pt, Ru)-doped OMCs was found to be higher than that of common Pt/C ORR catalysts. Presented study provides a new route for the synthesis of active and selective ORR catalysts in alkaline media, being competitive with, or superior to, the existing ones in terms of performance and price. (C) 2014 Elsevier Ltd. All rights reserved.",
journal = "Electrochimica Acta",
title = "Incorporation of Pt, Ru and Pt-Ru nanoparticles into ordered mesoporous carbons for efficient oxygen reduction reaction in alkaline media",
pages = "139-130",
volume = "153",
doi = "10.1016/j.electacta.2014.11.080"
}

Stojmenović, M., Momčilović, M. Z., Gavrilov, N. M., Pašti, I. A., Mentus, S. V., Jokić, B. M.,& Babić, B. M.. (2015). Incorporation of Pt, Ru and Pt-Ru nanoparticles into ordered mesoporous carbons for efficient oxygen reduction reaction in alkaline media. in Electrochimica Acta, 153, 130-139.
https://doi.org/10.1016/j.electacta.2014.11.080

Stojmenović M, Momčilović MZ, Gavrilov NM, Pašti IA, Mentus SV, Jokić BM, Babić BM. Incorporation of Pt, Ru and Pt-Ru nanoparticles into ordered mesoporous carbons for efficient oxygen reduction reaction in alkaline media. in Electrochimica Acta. 2015;153:130-139.
doi:10.1016/j.electacta.2014.11.080 .

Stojmenović, Marija, Momčilović, Milan Z., Gavrilov, Nemanja M., Pašti, Igor A., Mentus, Slavko V., Jokić, Bojan M., Babić, Biljana M., "Incorporation of Pt, Ru and Pt-Ru nanoparticles into ordered mesoporous carbons for efficient oxygen reduction reaction in alkaline media" in Electrochimica Acta, 153 (2015):130-139,
https://doi.org/10.1016/j.electacta.2014.11.080 . .