Volcano Activity Relationships for Proton-Coupled Electron Transfer Reactions in ElectrocatalysisReport as inadecuate




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Topics in Catalysis

, Volume 58, Issue 18–20, pp 1153–1158

First Online: 24 September 2015

Abstract

This paper studies simple kinetic models for proton-coupled electron transfer reactions, and demonstrates that for reactions in which proton and electron do not transfer simultaneously, pH dependence of the overall reaction rate is expected. In particular, if the current is evaluated on the reversible hydrogen scale, this may lead to volcano-type activity relations as a function of pH. In case that an acid–base equilibrium is part of the mechanism, the optimal pH occurs close to the pKa of this equilibrium.

KeywordsElectrocatalysis Proton-coupled electron transfer Volcano plot pH dependence Dedicated to Professor Costas Vayenas on the occasion of 65th birthday and in recognition of his seminal contributions to heterogeneous electro-catalysis.

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Author: Marc T. M. Koper

Source: https://link.springer.com/







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