Ce doping induces lattice expansion of cobalt oxide electrocatalyst to achieve efficient proton exchange membrane water electrolysis

IF 10 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Today Physics Pub Date : 2025-02-01 DOI:10.1016/j.mtphys.2024.101641

Zhi Wang , Jinpeng Li , Chengdeng Wang , Jiashuai Wang , Xiangrui Chen , Jun Wu , Zhiming Bai , Yan Gao , Li Chen , Xiaoqin Yan

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Abstract

The development of non-precious metal anode catalysts with high performance and low cost for proton exchange membrane (PEM) water electrolysis presents a significant challenge. This work successfully synthesized a bimetallic-doped cobalt-based oxide titanium diboride composite structure catalyst (Ce-Mn-Co₃O₄/TiB₂) by combining hydrothermal methods with heat treatment processes. Ce doping induces surface oxygen vacancies of Co₃O₄ to optimize adsorption energy, while Mn stabilizes lattice oxygen and impedes the dissolution of metal ions. Theoretical simulations support the experimental results, highlighting the strain effect of Ce doping on the Co₃O₄-TiB₂ interface, promoting further charge redistribution, and enhancing catalyst conductivity. Ce-Mn-Co₃O₄/TiB₂ exhibits a low oxygen evolution overpotential (389 mV @10 mA/cm²). Upon assembly into a PEM electrolytic cell, it achieves a current density of 250 mA/cm² at 1.63 V and demonstrates stable operation for nearly 25 h. This research provides novel ideas and methodologies for developing non-precious metal OER electrocatalysts suitable for PEM electrolysis.

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Ce掺杂诱导氧化钴电催化剂晶格膨胀实现高效质子交换膜电解

开发高性能、低成本的质子交换膜（PEM）电解用非贵金属阳极催化剂是一个重大挑战。本工作通过水热法与热处理工艺相结合成功合成了一种双金属掺杂钴基氧化物二硼化钛复合结构催化剂（Ce-Mn-Co3O4/TiB2）。Ce掺杂诱导Co3O4表面氧空位优化吸附能，Mn掺杂稳定晶格氧，阻碍金属离子的溶解。理论模拟支持实验结果，强调了Ce掺杂对Co3O4-TiB2界面的应变效应，促进了进一步的电荷再分配，提高了催化剂的导电性。Ce-Mn-Co3O4/TiB2具有低析氧过电位（389 mV @10mA/cm2）。在组装成PEM电解电池后，它在1.63 V下达到250 mA/cm2的电流密度，并表现出近25小时的稳定运行。本研究为开发适用于PEM电解的非贵金属OER电催化剂提供了新的思路和方法。

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来源期刊

Materials Today Physics Materials Science-General Materials Science

CiteScore

14.00

自引率

7.80%

发文量

284

审稿时长

15 days

期刊介绍： Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.