Citation: Xiaoke Xi, Xinpeng Li, Yang Liu, Yucheng Zhang, Linmei Li, Jianming Li, Xu Jin, Shuhong Jiao, Zhanwu Lei, Ruiguo Cao. Monolithic medium-entropy alloy electrode enables efficient and stable oxygen evolution reaction[J]. Chinese Chemical Letters, ;2025, 36(12): 110535. doi: 10.1016/j.cclet.2024.110535 shu

Monolithic medium-entropy alloy electrode enables efficient and stable oxygen evolution reaction

Xiaoke Xi ^{a, 1} ,
Xinpeng Li ^{a, 1} ,
Yang Liu ^a ,
Yucheng Zhang ^a ,
Linmei Li ^{b, *,} ,
Jianming Li ^c ,
Xu Jin ^d ,
Shuhong Jiao ^a ,
Zhanwu Lei ^{a, *,} ,
Ruiguo Cao ^{a, *,}

a.
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
b.
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China
c.
College of New Energy, Ningbo University of Technology, Ningbo 315211, China
d.
Research Center of New Energy, Research Institute of Petroleum Exploration and Development (RIPED), PetroChina, Beijing 100083, China

lilinmei@zjnu.edu.cn

zwlei@mail.ustc.edu.cn

rgcao@ustc.edu.cn

Received Date: 29 July 2024
Revised Date: 14 September 2024
Accepted Date: 8 October 2024
Available Online: 26 November 2024

Figures(6)

Electrochemical water splitting has attracted tremendous interest as a promising approach for generating sustainable hydrogen for transportation and other industrial applications. However, the oxygen evolution reaction (OER) significantly limits the efficiency of electrochemical water splitting because of the sluggish reaction kinetics derived from the intrinsic four-electron-transfer process. In addition, the stability of OER electrocatalysts encounters significant challenges during long-term operation under harsh conditions. To overcome these challenges, we demonstrate that monolithic electrodes composed of medium-entropy alloys (MEAs) containing Fe, Co, Cr, and Ni can be used as efficient and stable OER catalysts in alkaline solutions. The monolithic FeCoCrNi alloy electrode exhibited a remarkably low overpotential of 237 mV at a current density of 10 mA/cm² in a 1 mol/L KOH solution. Significantly, the monolithic alloy electrode can operate stably for more than 2000 h at a practical current density of 1 A/cm². The enhanced activity and stability of the alloy electrode are ascribed to surface reconstruction. This work presents a novel and effective approach for fabricating high-performance electrodes with excellent stability for the oxygen evolution reaction.
- Water electrolysis,
- Oxygen evolution reaction,
- Hydrogen production,
- Medium-entropy alloy,
- Monolithic electrode,
- Surface reconstruction
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