NiS2@NiOOH/CNT hybrid as robust catalyst for oxygen evolution reaction

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2025-04-28 DOI:10.1016/j.jelechem.2025.119159

Zhanyu Ding , Yu Ma , Xuanhao Zhang , Rizwan Haider , Qiqi Jiao , Jiemei Yu , Yanlu Mu , Taizhong Huang , Xianxia Yuan

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Abstract

Development of non-precious metal-based oxygen evolution reaction (OER) catalysts is essential for commercial scale electrochemical water splitting. In this paper, a carbon nanotube (CNT), which can enhance the conductivity of the catalyst, supported nickel sulfide (NiS₂) and nickel oxyhydroxide (NiOOH) hybrid (NiS₂@NiOOH/CNT) based catalyst is prepared. The in-situ conversion of partial NiS₂ to NiOOH not only increased the active catalytic sites but also decreased the OER overpotential to 195 mV at the current intensity of 10 mA/cm². The long-time running stability test results showed that the current density almost no losses detected after 10 h continuous operation at a fixed potential of 1.61 V (vs. RHE) in 1 M KOH. The density functional theory (DFT) calculations proved that the NiS₂@NiOOH/CNT catalyzed OER follows the lattice‑oxygen-mediated (LOM) mechanism, which illustrated the mechanism for the high catalytic performance for OER. This paper provides a novel way to design high performance electrocatalysts for OER from nickel based materials.

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NiS2@NiOOH/CNT杂化物作为析氧反应的稳健催化剂

非贵金属基析氧反应（OER）催化剂的开发是实现商业规模电化学水分解的必要条件。本文制备了一种能提高催化剂导电性的负载型硫化镍（NiS2）和氢氧镍（NiOOH）杂化（NiS2@NiOOH/CNT）催化剂。在10 mA/cm2电流强度下，部分NiS2原位转化为NiOOH不仅增加了活性催化位点，而且使OER过电位降至195 mV。长时间运行稳定性测试结果表明，在1 M KOH下，在1.61 V （vs. RHE）的固定电位下连续工作10 h后，电流密度几乎没有损耗。密度泛函理论（DFT）计算证明NiS2@NiOOH/CNT催化的OER遵循晶格氧介导（LOM）机制，说明了OER具有高催化性能的机理。本文为镍基材料OER电催化剂的设计提供了一种新的思路。

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

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.