Citation: Wentao Xu, Xuyan Mo, Yang Zhou, Zuxian Weng, Kunling Mo, Yanhua Wu, Xinlin Jiang, Dan Li, Tangqi Lan, Huan Wen, Fuqin Zheng, Youjun Fan, Wei Chen. Bimetal Leaching Induced Reconstruction of Water Oxidation Electrocatalyst for Enhanced Activity and Stability[J]. Acta Physico-Chimica Sinica, ;2024, 40(8): 230800. doi: 10.3866/PKU.WHXB202308003 shu

Bimetal Leaching Induced Reconstruction of Water Oxidation Electrocatalyst for Enhanced Activity and Stability

Wentao Xu ¹ ,
Xuyan Mo ¹ ,
Yang Zhou ¹ ,
Zuxian Weng ¹ ,
Kunling Mo ¹ ,
Yanhua Wu ¹ ,
Xinlin Jiang ¹ ,
Dan Li ¹ ,
Tangqi Lan ¹ ,
Huan Wen ² ,
Fuqin Zheng ^1,, ,
Youjun Fan ^1,, ,
Wei Chen ^1,,

1.
School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, Guangxi, China
2.
Guangxi Key Laboratory of Electrochemical Energy Materials, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

Corresponding author: Fuqin Zheng, fqzheng@mailbox.gxnu.edu.cn Youjun Fan, youjunfan@mailbox.gxnu.edu.cn Wei Chen, weichen@gxnu.edu.cn
Received Date: 1 August 2023
Revised Date: 22 September 2023
Accepted Date: 22 September 2023
Available Online: 9 October 2023
Fund Project: the Natural Science Foundation of Guangxi, China 2019GXNSFGA245003the Natural Science Foundation of Guangxi, China 2021GXNSFBA220058the National Natural Science Foundation of China 22002026the National Natural Science Foundation of China 22272036the Guangxi Technology Base and Talent Subject, China GUIKE AD23026272the Guangxi Normal University Research Grant, China 2022TD

Surface reconstruction inevitably occurs during pre-catalysis for the oxygen evolution reaction (OER); however, obtaining OER electrocatalysts with high performance and stability remains a challenge. In this study, we have developed a bimetallic leaching-induced surface reconstruction strategy to fabricate efficient electrocatalysts for water oxidation. Microcolumn arrays consisting of α-CoMoO₄, K₂Co₂(MoO₄)₃, Co₃O₄, and CoFe₂O₄ four-phase oxides were integrated as pre-catalyst by a hydrothermal, ion-exchange, and subsequent annealing process. In situ Raman spectroelectrochemical and ex situ X-ray diffraction (XRD) studies revealed that the rapid dissolution of the unstable component K₂Co₂(MoO₄)₃ triggered the adaptive leaching of Mo and K, which accelerated the transformation of the surface-enriched α-Co(OH)₂ to the active phase of CoOOH at low voltage. Furthermore, the stable CoFe₂O₄ component couples the reconfigured new phase CoO with the amorphous layer CoOOH to form a compact hierarchical structure of CoFe₂O₄@CoO@CoOOH, which plays the role of a nanofence and effectively prevents the catalyst from over-reconstruction, thus achieving excellent catalytic stability. This work provides a novel idea for designing OER catalysts with excellent activity and stability at high current densities.
- Oxygen evolution reaction,
- Surface reconstruction,
- Ion leaching,
- Water splitting,
- Electrocatalysis,
- Catalyst
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