| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Interfacial Engineered Ni(OH)2@CoP Core-Shell Nanoarrays for Enhanced Electrocatalytic Water Splitting Performance |
| LYU Chaojie1,*, CHENG Jiarun1, GUAN Chunyang1, LU Chengxin2, LI Meiping3, ZHANG Dan4
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1 School of Chemical Engineering and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China
2 College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China
3 Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
4 School of Forensic Medicine, Shanxi Medical University, Taiyuan 030607, China |
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Abstract Transition metal-based electrocatalysts are regarded as one of the powerful candidates to replace noble metal-based electrolysis water hydrogen production catalysts in the future because of their abundant earth reserves and low manufacturing cost. However, due to its low electrical conductivity, poor catalytic activity and catalytic stability of rapid decay, the monomer always displays poor catalytic performance, so it must be modified reasonably to improve its catalytic performance. Interface engineering has been proven to be one of the effective means to regulate the electronic structure of catalytic sites, optimize the adsorption energy of reaction intermediates and improve the catalytic performance of mate-rials. Based on this, the self-supporting heterogeneous core-shell array of Ni(OH)2 nanosheets/CoP nanowires was prepared by hydrothermal, phosphating and electrodeposition on nickel foam support (Ni(OH)2@CoP/NF). Among them, the heterogeneous interface between Ni(OH)2 and CoP leads to the directional electron transfer in the interface domain and the modulation of the electronic structure of the Ni sites, which not only generates a large number of new active sites in the interface region, but also optimizes the active sites to the best state, thus obtaining higher catalytic activity. Benefitting from this, when Ni(OH)2@CoP/NF is used as the catalytic material for oxygen evolution and hydrogen evolution reactions in 1 mol/L KOH solution, the overpotentials of only 224 mV and 65 mV are required to reach a current density of 10 mA·cm-2. As a bifunctional catalyst, the two-electrode system assembled with the electrode can achieve a current output of 10 mA·cm-2 with only 1.52 V, and also shows excellent catalytic durability. This study provides a new idea for the design and preparation of an efficient bifunctional water electrolysis catalyst for hydrogen production, which is of great significance for the further development of industrial application of non-precious transition metal compounds.
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Published: 10 July 2025
Online: 2025-07-21
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2025, Vol. 39 
