Ce doping-boosted lattice oxygen activation for NiCo2O4 in acidic oxygen evolution reaction

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-10-01 DOI:10.1016/j.apsusc.2025.164784

Yahui Li , Haolin Cheng , Jinli Zhang , Yan Fu

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引用次数: 0

Abstract

Developing low-cost non-noble electrocatalysts is crucial for acidic oxygen evolution reaction (OER); however, their performance still lags behind that of Ir-based catalysts. Herein, Ce-doped NiCo₂O₄ electrocatalysts were synthesized on carbon cloth (CC) by electrodeposition and subsequent calcination. The Ce doping effectively modulated the electronic redistribution of NiCo₂O₄, and Ce acted as a dynamic electron buffer to inhibit excessive oxidation of Co species during OER. The optimal 10 %Ce-NiCo₂O₄ exhibited an overpotential of 220 mV at 10 mA cm⁻² and maintained outstanding durability over 120 h, significantly outperforming undoped NiCo₂O₄ (353 mV; 40 h). Theoretical calculations and experimental results unraveled that Ce doping efficiently activated lattice oxygen oxidation and decreased the energy barrier of the rate-determining step, thereby favoring the involvement of the lattice oxygen oxidation mechanism (LOM) in 10 %Ce-NiCo₂O₄ during acidic OER. This work develops a promising strategy for constructing cost-effective electrocatalysts with high activity and stability in acidic OER.

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Ce掺杂促进NiCo2O4在酸性析氧反应中的晶格氧活化

开发低成本非贵金属电催化剂是酸性析氧反应（OER）的关键。然而，它们的性能仍然落后于基于ir的催化剂。在碳布（CC）上，通过电沉积和煅烧的方法合成了ce掺杂NiCo2O4电催化剂。Ce掺杂有效地调节了NiCo2O4的电子重分布，Ce作为动态电子缓冲器抑制了OER过程中Co的过度氧化。最佳的10 %Ce-NiCo2O4在10 mA cm - 2下的过电位为220 mV，并在120 h内保持出色的耐久性，显著优于未掺杂的NiCo2O4（353 mV; 40 h）。理论计算和实验结果表明，Ce掺杂有效地激活了晶格氧氧化，降低了速率决定步骤的能垒，从而有利于10 %Ce- nico2o4在酸性OER中的晶格氧氧化机制（LOM）的参与。本研究为构建具有高性价比、高活性和高稳定性的酸性OER电催化剂提供了一种有前景的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.