Issue 75, 2024

Probing the structural evolution of cobalt hydroxide in electrochemical water splitting

Abstract

Transition-metal hydroxides are a category of earth-abundant and stable electrocatalysts for energy storage and conversion devices involving sluggish oxygen evolution reaction (OER). Understanding dynamic evolution at the solid/liquid interface of transition-metal hydroxides is crucial for the rational design of high-performance OER electrocatalysts. This study implemented in situ electrochemical atomic force microscopy (EC-AFM) to directly image the dynamic structural evolution of α-Co(OH)2 platelets during the electrochemical OER. Reconstruction of α-Co(OH)2, accompanied by ion insertion from the electrolyte, results in a volume expansion, which can be well confirmed from the X-ray diffraction patterns. Our findings are important for the fundamental understanding of transition-metal hydroxide oxygen-evolution catalysts, illustrating the dynamic nature of Co-based nanostructures under electrochemical conditions.

Graphical abstract: Probing the structural evolution of cobalt hydroxide in electrochemical water splitting

Supplementary files

Article information

Article type
Communication
Submitted
28 Mezh. 2024
Accepted
21 Eost 2024
First published
31 Eost 2024

Chem. Commun., 2024,60, 10326-10329

Probing the structural evolution of cobalt hydroxide in electrochemical water splitting

C. Yang, T. Lu and L. Zhang, Chem. Commun., 2024, 60, 10326 DOI: 10.1039/D4CC03173C

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