Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (4): 673-679.doi: 10.1007/s40242-023-3108-z

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Crystalline-Amorphous Ni3Se4-Ni Hydroxide Heterostructure as an Efficient Electrocatalyst for Oxidation Evolution Reaction

WANG Teng1,2, HU Renquan1,2, WEI Hao1,2, WEI Zehui1,2, YAN Meng1,2, YANG Yong1,2   

  1. 1. State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an 710072, P.R. China;
    2. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, P.R. China
  • Received:2023-04-24 Online:2023-08-01 Published:2023-07-18
  • Contact: YANG Yong E-mail:yongyangfj@nwpu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No.51902266), the Research Fund of the State Key Laboratory of Solidification Processing(NPU), China(No.2022-QZ-03), the Shenzhen Science and Technology Program, China(No.JCYJ20210324142805014), and the Opening Project of State Key Laboratory of Polymer Materials Engineering(Sichuan University), China(No.sklpme 2022-4-05).

Abstract: Developing low-cost Ni-based amorphous/crystalline composites with well-defined nanostructures is expected to achieve a highly efficient oxygen evolution reaction(OER) by exposing more active sites and enhancing the electrical conductivity, but it still remains a synthetic challenge. Here, a crystalline/amorphous composite composed of crystalline Ni3Se4 and amorphous Ni hydroxide with a multi-layered bowl-shaped nanostructure was synthesized by a simple one-step solvothermal method. By regulating the concentration of sulfate ions in the reaction solution, the single-layered nanosheets achieve a transformation into a multi-layered structure with more exposed active sites. In addition, the crystalline-amorphous heterostructure allows regulation of the interfacial electronic structures, and the decoration of Ni3Se4 can effectively enhance the electrical conductivity of composites. Benefiting from the interfacial synergy between Ni3Se4 and Ni hydroxide, the as-optimized Ni3Se4/Ni hydroxide as an OER catalyst displayed superior electrocatalytic activity with a low overpotential of 285 mV at a current density of 10 mA/cm2, a small Tafel slope of 68.3 mV/dec and remarkable stability in alkaline solution. This work offers a novel and effective method for the design of functional crystalline/amorphous composites for energy conversion and storage.

Key words: Nickle selenide, Amorphous Ni hydroxide, Regulation of morphology, Oxygen evolution reaction