Issue 48, 2021

The determination of the HOR/HER reaction mechanism from experimental kinetic data

Abstract

Hydrogen oxidation and evolution are important processes from both a fundamental and applied perspective. In interpreting experimental kinetic data, few studies have explicitly accounted for the impact of H* coverage and mass transport, which lead to discrepancies in the kinetic parameters and the resultant reaction mechanism. Here, we present how to determine the kinetic parameters accounting for both effects. We discuss the use of the kinetic parameters towards mechanistic interpretations for HOR/HER and show that, in general, knowledge of the coverage of H* or activation energies may be required to assign a reaction mechanism. We apply these ideas to activity data of several HOR and HER electrocatalysts, such as Au, Pt, MoS2, and CoP.

Graphical abstract: The determination of the HOR/HER reaction mechanism from experimental kinetic data

Supplementary files

Article information

Article type
Perspective
Submitted
09 Sep 2021
Accepted
25 Nov 2021
First published
25 Nov 2021
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2021,23, 27150-27158

The determination of the HOR/HER reaction mechanism from experimental kinetic data

H. Prats and K. Chan, Phys. Chem. Chem. Phys., 2021, 23, 27150 DOI: 10.1039/D1CP04134G

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