Role of Crystalline Defects in Electrocatalysis: Mechanism and Kinetics of CO Adlayer Oxidation on Stepped Platinum Electrodes
Publication type: Journal Article
Publication date: 2002-11-27
scimago Q1
wos Q3
SJR: 0.742
CiteScore: 5.3
Impact factor: 2.9
ISSN: 15206106, 15205207, 10895647
Materials Chemistry
Surfaces, Coatings and Films
Physical and Theoretical Chemistry
Abstract
The kinetics of the electrochemical oxidation of a CO adlayer on Pt[n(111)×(111)] electrodes in 0.5 M H2SO4 has been studied using chronoamperometry. The objective is to elucidate the effect of the crystalline defects on the rate of the reaction by using a series of stepped surfaces. The reaction kinetics of the main oxidative process can be modeled using the mean-field approximation for the Langmuir−Hinshelwood mechanism, implying fast diffusion of adsorbed CO on the Pt[n(111)×(111)] surfaces under electrochemical conditions. The apparent rate constant for the electrochemical CO oxidation, determined by a fitting of the experimental data with the mean-field model, is found to be proportional to the step fraction (1/n) for the surfaces with n > 5, proving steps to be the active sites for the CO adlayer oxidation. An apparent intrinsic rate constant is determined. The potential dependence of the apparent rate constants is found to be structure insensitive with a Tafel slope of ca. 80 mV/dec, suggesting the...
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Total citations:
373
Citations from 2024:
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(5.1%)
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Lebedeva N. et al. Role of Crystalline Defects in Electrocatalysis: Mechanism and Kinetics of CO Adlayer Oxidation on Stepped Platinum Electrodes // Journal of Physical Chemistry B. 2002. Vol. 106. No. 50. pp. 12938-12947.
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Lebedeva N., Koper M. T., Feliu J. M., van Santen R. A. Role of Crystalline Defects in Electrocatalysis: Mechanism and Kinetics of CO Adlayer Oxidation on Stepped Platinum Electrodes // Journal of Physical Chemistry B. 2002. Vol. 106. No. 50. pp. 12938-12947.
Cite this
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TY - JOUR
DO - 10.1021/jp0204105
UR - https://doi.org/10.1021/jp0204105
TI - Role of Crystalline Defects in Electrocatalysis: Mechanism and Kinetics of CO Adlayer Oxidation on Stepped Platinum Electrodes
T2 - Journal of Physical Chemistry B
AU - Lebedeva, N.P.
AU - Koper, Marc T.
AU - Feliu, Juan M.
AU - van Santen, R. A.
PY - 2002
DA - 2002/11/27
PB - American Chemical Society (ACS)
SP - 12938-12947
IS - 50
VL - 106
SN - 1520-6106
SN - 1520-5207
SN - 1089-5647
ER -
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@article{2002_Lebedeva,
author = {N.P. Lebedeva and Marc T. Koper and Juan M. Feliu and R. A. van Santen},
title = {Role of Crystalline Defects in Electrocatalysis: Mechanism and Kinetics of CO Adlayer Oxidation on Stepped Platinum Electrodes},
journal = {Journal of Physical Chemistry B},
year = {2002},
volume = {106},
publisher = {American Chemical Society (ACS)},
month = {nov},
url = {https://doi.org/10.1021/jp0204105},
number = {50},
pages = {12938--12947},
doi = {10.1021/jp0204105}
}
Cite this
MLA
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Lebedeva, N.P., et al. “Role of Crystalline Defects in Electrocatalysis: Mechanism and Kinetics of CO Adlayer Oxidation on Stepped Platinum Electrodes.” Journal of Physical Chemistry B, vol. 106, no. 50, Nov. 2002, pp. 12938-12947. https://doi.org/10.1021/jp0204105.