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Solvated Proton and the Origin of the High Onset Overpotential in the Oxygen Reduction Reaction on Pt(111)

preprint
submitted on 30.06.2020 and posted on 02.07.2020 by Yuke Li, Zhi-Feng Liu

For the oxygen reduction reaction (ORR) in acidic media, proton is a key component in the hydrogenation of O2, O, and OH. Modeling a proton requires the explicit account of its solvation and dynamic nature in the interfacial solution region. We employed ab initio molecular dynamics method to study such reactions on Pt(111), a model problem in electro-catalysis. Our results show that the branching ratio for the two hydrogenation channels of O atoms adsorbed on Pt(111) shifts dramatically with the electrode potential. This kinetic factor underlies the electrochemical observations peculiar to ORR on Pt(111), and provides an explanation for the long standing puzzle of its high onset overpotential.

Funding

GRF Grant (14303114) from the Research Grants Council of Hong Kong SAR Government

History

Email Address of Submitting Author

yukeli@link.cuhk.edu.hk

Institution

Chinese University of Hong Kong

Country

China

ORCID For Submitting Author

0000-0003-0162-5072

Declaration of Conflict of Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Exports