The influence of poisoning of Pt catalyst by CO on the kinetics and mechanism of H-2 oxidation reaction (HOR) at Pt/C electrode in 0.5 mol dm(-3) HClO4, saturated with H-2 containing 100 ppm CO, was examined with rotating disc electrode (RDE) at 22 degrees C. Commercial carbon black, Vulcan XC-72 was used as support, while Pt/C catalyst was prepared by modified polyol synthesis method in an ethylene glycol (EG) solution. The kinetically controlled current (l(k)) for the HOR at Pt/C decreases significantly at CO coverage (Theta(co)) > 0.6. For Theta(co) lt 0.6 the HOR takes place through Tafel-Volmer mechanism with Tafel reaction as rate-determining step at the low CO coverage, while Volmer step controls the overall reaction rate at the medium CO coverage. When CO coverage is higher then 0.6, Heyrovsky-Volmer mechanism is operative for the HOR with Heyrovsky as the rate-determining step (rds).
TY - JOUR
AU - Elezović, Nevenka R.
AU - Gajić-Krstajić, Ljiljana M
AU - Radmilović, Velimir R
AU - Vračar, Ljiljana M
AU - Krstajić, Nedeljko V
PY - 2009
UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/322
AB - The influence of poisoning of Pt catalyst by CO on the kinetics and mechanism of H-2 oxidation reaction (HOR) at Pt/C electrode in 0.5 mol dm(-3) HClO4, saturated with H-2 containing 100 ppm CO, was examined with rotating disc electrode (RDE) at 22 degrees C. Commercial carbon black, Vulcan XC-72 was used as support, while Pt/C catalyst was prepared by modified polyol synthesis method in an ethylene glycol (EG) solution. The kinetically controlled current (l(k)) for the HOR at Pt/C decreases significantly at CO coverage (Theta(co)) > 0.6. For Theta(co) lt 0.6 the HOR takes place through Tafel-Volmer mechanism with Tafel reaction as rate-determining step at the low CO coverage, while Volmer step controls the overall reaction rate at the medium CO coverage. When CO coverage is higher then 0.6, Heyrovsky-Volmer mechanism is operative for the HOR with Heyrovsky as the rate-determining step (rds).
PB - Pergamon-Elsevier Science Ltd, Oxford
T2 - Electrochimica Acta
T1 - Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction
EP - 1382
IS - 4
SP - 1375
VL - 54
DO - 10.1016/j.electacta.2008.08.067
ER -
@article{
author = "Elezović, Nevenka R. and Gajić-Krstajić, Ljiljana M and Radmilović, Velimir R and Vračar, Ljiljana M and Krstajić, Nedeljko V",
year = "2009",
abstract = "The influence of poisoning of Pt catalyst by CO on the kinetics and mechanism of H-2 oxidation reaction (HOR) at Pt/C electrode in 0.5 mol dm(-3) HClO4, saturated with H-2 containing 100 ppm CO, was examined with rotating disc electrode (RDE) at 22 degrees C. Commercial carbon black, Vulcan XC-72 was used as support, while Pt/C catalyst was prepared by modified polyol synthesis method in an ethylene glycol (EG) solution. The kinetically controlled current (l(k)) for the HOR at Pt/C decreases significantly at CO coverage (Theta(co)) > 0.6. For Theta(co) lt 0.6 the HOR takes place through Tafel-Volmer mechanism with Tafel reaction as rate-determining step at the low CO coverage, while Volmer step controls the overall reaction rate at the medium CO coverage. When CO coverage is higher then 0.6, Heyrovsky-Volmer mechanism is operative for the HOR with Heyrovsky as the rate-determining step (rds).",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction",
pages = "1382-1375",
number = "4",
volume = "54",
doi = "10.1016/j.electacta.2008.08.067"
}
Elezović, N. R., Gajić-Krstajić, L. M., Radmilović, V. R., Vračar, L. M.,& Krstajić, N. V.. (2009). Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 54(4), 1375-1382.
https://doi.org/10.1016/j.electacta.2008.08.067
Elezović NR, Gajić-Krstajić LM, Radmilović VR, Vračar LM, Krstajić NV. Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction. in Electrochimica Acta. 2009;54(4):1375-1382.
doi:10.1016/j.electacta.2008.08.067 .
Elezović, Nevenka R., Gajić-Krstajić, Ljiljana M, Radmilović, Velimir R, Vračar, Ljiljana M, Krstajić, Nedeljko V, "Effect of chemisorbed carbon monoxide on Pt/C electrode on the mechanism of the hydrogen oxidation reaction" in Electrochimica Acta, 54, no. 4 (2009):1375-1382,
https://doi.org/10.1016/j.electacta.2008.08.067 . .
