Construction of Self-healing Active Centers over Amorphous Ni2Fe(OH)x Nanosheets for Enhanced Oxygen Evolution Performance

IF 4.7 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Pub Date : 2025-03-07 DOI:10.1021/acs.inorgchem.4c05429

Aoqi Tang, Pei Zhu, Wen Zhang, Zhongbin Zhuang, Shuang Yao, Changhua An

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Abstract

Developing efficient nickel–iron-based electrocatalysts for the oxygen evolution reaction (OER) still remains a challenge for long-term application in water electrolysis. Herein, amorphous Ni₂Fe hydroxide nanosheets with self-healing active centers supported on stainless steel mesh (a-Ni₂Fe(OH)_x/SSM) are fabricated using a simple electrochemical deposition strategy. In situ Raman evidence shows that the amorphous structure of a-Ni₂Fe(OH)_x/SSM exhibits strong self-healing ability, efficiently promoting the rapid interconversion between the γ-NiOOH intermediate and Ni-based hydroxides during electrocatalysis. As a result, the as-obtained a-Ni₂Fe(OH)_x/SSM exhibits a low overpotential of 247 mV at 100 mA cm^–2 and robust electrochemical stability for 200 h. Moreover, an anion-exchange membrane electrolyzer for water splitting is assembled utilizing a-Ni₂Fe(OH)_x/SSM as the anode, and current densities of 500 and 1000 mA cm^–2 are achieved at 1.62 and 1.72 V, respectively, with stable performance at 500 mA cm^–2 over 30 h. This work provides a facile approach for designing amorphous catalysts for various useful reactions.

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在非晶Ni2Fe(OH)x纳米片上构建自愈活性中心以增强析氧性能

开发高效的镍铁基析氧反应电催化剂，是水电解长期应用的一个挑战。本文采用简单的电化学沉积策略制备了具有自修复活性中心的非晶态氢氧化Ni2Fe纳米片（a-Ni2Fe(OH)x/SSM），该纳米片由不锈钢网支撑。原位拉曼证据表明，a-Ni2Fe(OH)x/SSM的非晶结构表现出较强的自愈能力，在电催化过程中有效地促进了γ-NiOOH中间体与ni基氢氧化物之间的快速相互转化。结果表明，a- ni2fe (OH)x/SSM在100 mA cm-2下具有247 mV的低过电位，且在200 h内具有良好的电化学稳定性。此外，利用a- ni2fe (OH)x/SSM作为阳极组装了用于水分解的阴离子交换膜电解槽，在1.62 V和1.72 V下分别实现了500和1000 mA cm-2的电流密度。在500毫安cm-2下超过30小时具有稳定的性能。这项工作为设计各种有用反应的非晶催化剂提供了一种简便的方法。

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

Inorganic Chemistry 化学-无机化学与核化学

CiteScore

7.60

自引率

13.00%

发文量

1960

审稿时长

1.9 months

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.