Sub-monolayers of iridium electrodeposited on Ti2AlC substrate as catalysts for hydrogen evolution reaction in sulfuric acid solution
Nekoliko monoslojeva elektrohemijski istaloženog iridijuma na podlozi od Ti2AlC kao katalizatori za izdvajanje vodonika u rastvoru sumporne kiseline
Abstract
The hydrogen evolution reaction (HER) was investigated at sub-monolayers of iridium electrodeposited on Ti2AlC substrate. The lowest amount of electrodeposited iridium was 3 close-packed (111) monolayers (3 ML), while the highest one was 22 ML (3, 5, 10, 15 and 22 ML). The lowest and the highest amounts of iridium were electrodeposited by linear sweep voltammetry (LSV), while the other three samples were electrodeposited by controlled potential coulometry, from the solution containing 1 mM, or 3 mM K3IrCl6 + 0.5 M Na2SO4 (pH 6.2) at 70 °C. The HER was investigated by polarization and electrochemical impedance spectroscopy (EIS) measurements. Polarization curves for iridium sub-monolayers equal, or higher than 6 ML showed low Tafel slope of -14 to -16 mV dec-1 up to about -0.1 A cm-2, while at higher current densities the Tafel slopes increased, varying between -40 and -72 mV dec-1. The highest value of exchange current density (jo) was obtained for 6 ML of electrodeposited iridium, bei...ng -27.89 A g-1. The overpotential at j = -0.3 A cm-2 could be determined for samples containing 15 ML and 22 ML of iridium, being 82 mV.
Izdvajanje vodonika ispitivano je u rastvoru sumporne kiseline na elektrohemijski istaloženim slojevima (od 3 monosloja do 22 monosloja) iridijuma na podlozi od Ti2AlC. Najmanja i najveća količina iridijuma (3 i 22 monosloja) elektrohemijski su istaložene metodom linearne voltametrije, dok su preostala tri uzorka (6, 10 i 15 monoslojeva) elektrohemijski istaložena pri konstantnom potencijalu do potrebne količine naelektrisanja iz rastvora 1 mM, ili 3 mM K3IrCl6 + 0.5 M Na2SO4 (pH 6.2) na temperaturi rastvora od 70 °C. Reakcija izdvajanja vodonika ispitivana je na svim elektrodama snimanjem polarizacionih krivih. Za uzorak sa 22 monosloja Ir primenjena je i metoda impedanse. Polarizacione krive za uzorke sa 6, 10, 15 i 22 monosloja Ir bile su okarakterisane malom vrednošću Tafel-ovog nagiba od -14 to -16 mV dek-1 u oblasti gustina struja do -0.1 A cm-2, dok se Tafel-ov nagib povećavao pri većim gustinama struja varirajući od -40 do -72 mV dek-1. Najveća vrednost specifične gustine struj...e izmene (jo) dobijena je kod uzorka sa 6 monoslojeva Ir i iznosila je - 27.89 A g-1. Za uzorke sa 15 i 22 monosloja Ir vrednost prenapetosti pri gustini struje j = -0.3 A cm-2 (uslovi industrijske proizvodnje vodonika) iznosila je 82 mV.
Keywords:
Sub-monolayer / iridium electrodeposition / hydrogen evolution / sulfuric acid / izdvajanje vodonika / elektrohemijsko taloženje Ir (3 do 22 monosloja) / sumporna kiselinaSource:
Zaštita materijala, 2020, 61, 3, 181-191Publisher:
- Engineering Society for Corrosion, Belgrade, Serbia
Funding / projects:
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200053 (University of Belgrade, Institute for Multidisciplinary Research) (RS-MESTD-inst-2020-200053)
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200135 (University of Belgrade, Faculty of Technology and Metallurgy) (RS-MESTD-inst-2020-200135)
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Elezović, Nevenka R. AU - Krstajić-Pajić, Mila AU - Jović, Vladimir D. PY - 2020 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4551 AB - The hydrogen evolution reaction (HER) was investigated at sub-monolayers of iridium electrodeposited on Ti2AlC substrate. The lowest amount of electrodeposited iridium was 3 close-packed (111) monolayers (3 ML), while the highest one was 22 ML (3, 5, 10, 15 and 22 ML). The lowest and the highest amounts of iridium were electrodeposited by linear sweep voltammetry (LSV), while the other three samples were electrodeposited by controlled potential coulometry, from the solution containing 1 mM, or 3 mM K3IrCl6 + 0.5 M Na2SO4 (pH 6.2) at 70 °C. The HER was investigated by polarization and electrochemical impedance spectroscopy (EIS) measurements. Polarization curves for iridium sub-monolayers equal, or higher than 6 ML showed low Tafel slope of -14 to -16 mV dec-1 up to about -0.1 A cm-2, while at higher current densities the Tafel slopes increased, varying between -40 and -72 mV dec-1. The highest value of exchange current density (jo) was obtained for 6 ML of electrodeposited iridium, being -27.89 A g-1. The overpotential at j = -0.3 A cm-2 could be determined for samples containing 15 ML and 22 ML of iridium, being 82 mV. AB - Izdvajanje vodonika ispitivano je u rastvoru sumporne kiseline na elektrohemijski istaloženim slojevima (od 3 monosloja do 22 monosloja) iridijuma na podlozi od Ti2AlC. Najmanja i najveća količina iridijuma (3 i 22 monosloja) elektrohemijski su istaložene metodom linearne voltametrije, dok su preostala tri uzorka (6, 10 i 15 monoslojeva) elektrohemijski istaložena pri konstantnom potencijalu do potrebne količine naelektrisanja iz rastvora 1 mM, ili 3 mM K3IrCl6 + 0.5 M Na2SO4 (pH 6.2) na temperaturi rastvora od 70 °C. Reakcija izdvajanja vodonika ispitivana je na svim elektrodama snimanjem polarizacionih krivih. Za uzorak sa 22 monosloja Ir primenjena je i metoda impedanse. Polarizacione krive za uzorke sa 6, 10, 15 i 22 monosloja Ir bile su okarakterisane malom vrednošću Tafel-ovog nagiba od -14 to -16 mV dek-1 u oblasti gustina struja do -0.1 A cm-2, dok se Tafel-ov nagib povećavao pri većim gustinama struja varirajući od -40 do -72 mV dek-1. Najveća vrednost specifične gustine struje izmene (jo) dobijena je kod uzorka sa 6 monoslojeva Ir i iznosila je - 27.89 A g-1. Za uzorke sa 15 i 22 monosloja Ir vrednost prenapetosti pri gustini struje j = -0.3 A cm-2 (uslovi industrijske proizvodnje vodonika) iznosila je 82 mV. PB - Engineering Society for Corrosion, Belgrade, Serbia T2 - Zaštita materijala T1 - Sub-monolayers of iridium electrodeposited on Ti2AlC substrate as catalysts for hydrogen evolution reaction in sulfuric acid solution T1 - Nekoliko monoslojeva elektrohemijski istaloženog iridijuma na podlozi od Ti2AlC kao katalizatori za izdvajanje vodonika u rastvoru sumporne kiseline EP - 191 IS - 3 SP - 181 VL - 61 DO - 10.5937/zasmat2003181E ER -
@article{ author = "Elezović, Nevenka R. and Krstajić-Pajić, Mila and Jović, Vladimir D.", year = "2020", abstract = "The hydrogen evolution reaction (HER) was investigated at sub-monolayers of iridium electrodeposited on Ti2AlC substrate. The lowest amount of electrodeposited iridium was 3 close-packed (111) monolayers (3 ML), while the highest one was 22 ML (3, 5, 10, 15 and 22 ML). The lowest and the highest amounts of iridium were electrodeposited by linear sweep voltammetry (LSV), while the other three samples were electrodeposited by controlled potential coulometry, from the solution containing 1 mM, or 3 mM K3IrCl6 + 0.5 M Na2SO4 (pH 6.2) at 70 °C. The HER was investigated by polarization and electrochemical impedance spectroscopy (EIS) measurements. Polarization curves for iridium sub-monolayers equal, or higher than 6 ML showed low Tafel slope of -14 to -16 mV dec-1 up to about -0.1 A cm-2, while at higher current densities the Tafel slopes increased, varying between -40 and -72 mV dec-1. The highest value of exchange current density (jo) was obtained for 6 ML of electrodeposited iridium, being -27.89 A g-1. The overpotential at j = -0.3 A cm-2 could be determined for samples containing 15 ML and 22 ML of iridium, being 82 mV., Izdvajanje vodonika ispitivano je u rastvoru sumporne kiseline na elektrohemijski istaloženim slojevima (od 3 monosloja do 22 monosloja) iridijuma na podlozi od Ti2AlC. Najmanja i najveća količina iridijuma (3 i 22 monosloja) elektrohemijski su istaložene metodom linearne voltametrije, dok su preostala tri uzorka (6, 10 i 15 monoslojeva) elektrohemijski istaložena pri konstantnom potencijalu do potrebne količine naelektrisanja iz rastvora 1 mM, ili 3 mM K3IrCl6 + 0.5 M Na2SO4 (pH 6.2) na temperaturi rastvora od 70 °C. Reakcija izdvajanja vodonika ispitivana je na svim elektrodama snimanjem polarizacionih krivih. Za uzorak sa 22 monosloja Ir primenjena je i metoda impedanse. Polarizacione krive za uzorke sa 6, 10, 15 i 22 monosloja Ir bile su okarakterisane malom vrednošću Tafel-ovog nagiba od -14 to -16 mV dek-1 u oblasti gustina struja do -0.1 A cm-2, dok se Tafel-ov nagib povećavao pri većim gustinama struja varirajući od -40 do -72 mV dek-1. Najveća vrednost specifične gustine struje izmene (jo) dobijena je kod uzorka sa 6 monoslojeva Ir i iznosila je - 27.89 A g-1. Za uzorke sa 15 i 22 monosloja Ir vrednost prenapetosti pri gustini struje j = -0.3 A cm-2 (uslovi industrijske proizvodnje vodonika) iznosila je 82 mV.", publisher = "Engineering Society for Corrosion, Belgrade, Serbia", journal = "Zaštita materijala", title = "Sub-monolayers of iridium electrodeposited on Ti2AlC substrate as catalysts for hydrogen evolution reaction in sulfuric acid solution, Nekoliko monoslojeva elektrohemijski istaloženog iridijuma na podlozi od Ti2AlC kao katalizatori za izdvajanje vodonika u rastvoru sumporne kiseline", pages = "191-181", number = "3", volume = "61", doi = "10.5937/zasmat2003181E" }
Elezović, N. R., Krstajić-Pajić, M.,& Jović, V. D.. (2020). Sub-monolayers of iridium electrodeposited on Ti2AlC substrate as catalysts for hydrogen evolution reaction in sulfuric acid solution. in Zaštita materijala Engineering Society for Corrosion, Belgrade, Serbia., 61(3), 181-191. https://doi.org/10.5937/zasmat2003181E
Elezović NR, Krstajić-Pajić M, Jović VD. Sub-monolayers of iridium electrodeposited on Ti2AlC substrate as catalysts for hydrogen evolution reaction in sulfuric acid solution. in Zaštita materijala. 2020;61(3):181-191. doi:10.5937/zasmat2003181E .
Elezović, Nevenka R., Krstajić-Pajić, Mila, Jović, Vladimir D., "Sub-monolayers of iridium electrodeposited on Ti2AlC substrate as catalysts for hydrogen evolution reaction in sulfuric acid solution" in Zaštita materijala, 61, no. 3 (2020):181-191, https://doi.org/10.5937/zasmat2003181E . .