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    • Tailoring the Electronic Structure of NiMoO4 Nanowires with NiCo2O4 Nanosheets by Constructing Heterostructure Interfaces for Improving Oxygen Evolution Reaction

    Xuanyu Zhou,Yan Li, Jiahao Zhao, Yuyuan Huang,Lei Zhang, Yi Li,Weiwei Bao,Junjun Zhang

    IONICS（2023）

    Shaanxi University of Technology | Ningxia University

    Cited 3|Views12
    Abstract
    In the present work, an electrocatalytic electrode NiMoO4@NiCo2O4/NF with heterojunction structure was grown by hydrothermal synthesis and electrodeposition process on nickel foam (NF). The construction and morphology of electrode materials were represented through X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The oxygen evolution reaction (OER) property of NiMoO4@NiCo2O4/NF was researched in basic solution. The consequences show that the heterostructural electrode NiMoO4@NiCo2O4/NF has outstanding OER catalytic performance, and only at 100 mA cm−2 it can achieve 330 mV overpotential, electronic structure of the electrode interface is well regulated by the combination of the two constituents. Meanwhile, the electrode materials show the good performance in the stability test. The experiment presents a novel method for the preparation of inexpensive, high catalytic activity and continuous durability of non-noble metal based water electrolysis catalyst, which has great development potential.
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    Key words
    NiMoO4 nanowires,NiCo2O4 nanosheets,Heterostructure,Electrocatalysis,Oxygen evolution reaction
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    【要点】：本研究通过构建异质结构界面，将NiMoO4纳米线与NiCo2O4纳米片相结合，调控了NiMoO4 @NiCo2O4/NF电催化电极的电子结构，提高了氧气发生反应的性能。
    

    【方法】：采用水热合成和电沉积方法，在镍泡沫上生长具有异质结构的电催化电极NiMoO4 @NiCo2O4/NF，并通过X射线衍射（XRD）、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）表征其结构和形貌。
    

    【实验】：在碱性溶液中研究了NiMoO4 @NiCo2O4/NF的氧气发生反应（OER）性能。结果表明，异质结构电催化电极NiMoO4 @NiCo2O4/NF具有出色的OER催化性能，在100 mA cm-2时只需达到330 mV过电位，电极界面的电子结构通过两种组分的结合得到良好调控。同时，电催化材料在稳定性测试中表现出良好的性能。该实验提出了一种廉价、高催化活性和持久性的非贵金属基水电解催化剂的新方法，具有很大的发展潜力。