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Updated: Sep 15, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Five key concepts linking vacancies, structure, and oxygen evolution reaction activity in cobalt-based
Kenneth Crossley1, Thomas J Schmidt1,2, Emiliana Fabbri1
1PSI Center for Energy and Environmental Science, 5232 Villigen PSI, Switzerland. emiliana.fabbri@psi.ch.
Abstract:
Focusing on five key concepts, we review the roles of cation and oxygen vacancies in determining the surface reconstruction pathway, reaction mechanism, and ultimate activity of cobalt-based oxygen evolution reaction (OER) electrocatalysts. Cation and oxygen vacancies can initiate reactant adsorption, facilitating active surface reconstruction, and can switch the dominant mechanism from the adsorbate evolution mechanism (AEM) to the lattice oxygen evolution mechanism (LOEM). However, these effects are facet-dependent. Rigorous oxygen vacancy quantification promises to identify the OER mechanism steering thresholds and unlock the full potential of vacancy engineering. Finally, oxygen vacancy quantification strategies are critically examined to facilitate this goal.
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