期刊
CHEMPHYSCHEM
卷 21, 期 6, 页码 469-475出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201901091
关键词
kinetic isotope effect; oxygen reduction reaction; PEM fuel cells; platinum; rate-determining step
资金
- Electrochemical Society (ECS) Toyota Young Investigator Fellowship
Kinetic isotope effect (KIE) was used to study the rate-determining step for oxygen reduction reaction (ORR) on dispersed Pt/C electrocatalyst and polycrystalline Pt (Pt-poly). KIE is defined as the ratio of the kinetic current measured in protonated electrolyte versus deuterated electrolyte, with KIE values larger than one indicating proton participation in the rate-determining step. The effect of poisoning anions on the platinum rate determining step is investigated by assessing the KIE in perchloric (non-poisoning) and sulfuric acid-based electrolytes. The kinetics currents were calculated using the Koutechy-Levich and Tafel analysis. A KIE of 1 was observed for Pt/C (with a 40 wt.% Pt loading) and Pt-poly, thus indicating that, on 40 wt. % Pt/C and Pt-poly, the rate determining step is proton independent.
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