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High-spin Co3+ in cobalt oxyhydroxide for efficient water oxidation.

Authors :
Zhang, Xin
Zhong, Haoyin
Zhang, Qi
Zhang, Qihan
Wu, Chao
Yu, Junchen
Ma, Yifan
An, Hang
Wang, Hao
Zou, Yiming
Diao, Caozheng
Chen, Jingsheng
Yu, Zhi Gen
Xi, Shibo
Wang, Xiaopeng
Xue, Junmin
Source :
Nature Communications; 2/15/2024, Vol. 15 Issue 1, p1-10, 10p
Publication Year :
2024

Abstract

Cobalt oxyhydroxide (CoOOH) is a promising catalytic material for oxygen evolution reaction (OER). In the traditional CoOOH structure, Co<superscript>3+</superscript> exhibits a low-spin state configuration ( t 2 g 6 e g 0 ), with electron transfer occurring in face-to-face t 2 g * orbitals. In this work, we report the successful synthesis of high-spin state Co<superscript>3+</superscript> CoOOH structure, by introducing coordinatively unsaturated Co atoms. As compared to the low-spin state CoOOH, electron transfer in the high-spin state CoOOH occurs in apex-to-apex e g * orbitals, which exhibits faster electron transfer ability. As a result, the high-spin state CoOOH performs superior OER activity with an overpotential of 226 mV at 10 mA cm<superscript>−2</superscript>, which is 148 mV lower than that of the low-spin state CoOOH. This work emphasizes the effect of the spin state of Co<superscript>3+</superscript> on OER activity of CoOOH based electrocatalysts for water splitting, and thus provides a new strategy for designing highly efficient electrocatalysts. Regulating spin state of metal cations in catalysts is recognized as a strategy to improve water oxidation. Herein, the authors constructed high-spin cobalt ions in cobalt oxyhydroxides, experimentally demonstrating accelerated electron transfer ability and thereby superior water oxidation performance. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20411723
Volume :
15
Issue :
1
Database :
Complementary Index
Journal :
Nature Communications
Publication Type :
Academic Journal
Accession number :
175755389
Full Text :
https://doi.org/10.1038/s41467-024-45702-4