J. Mater. Sci. Technol. ›› 2021, Vol. 73: 145-150.DOI: 10.1016/j.jmst.2020.09.016

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Self-supporting nanoporous Ni/metallic glass composites with hierarchically porous structure for efficient hydrogen evolution reaction

Jing Wanga, Li Youa, Zhibin Lia, Xiongjun Liua,*(), Rui Lia,b, Qing Dua, Xianzhen Wanga, Hui Wanga,*(), Yuan Wua, Suihe Jianga, Zhaoping Lua   

  1. aState Key Laboratory for Advanced Metals andMaterials, University of Science and TechnologyBeijing, Beijing 100083, PR China
    bAdvanced Manufacturing Technology ResearchCentre, Department of Industrial and SystemsEngineering, The Hong Kong Polytechnic University,Hong Kong, PR China

Abstract:

Searching for free-standing and cost-efficient hydrogen evolution reaction (HER) electrocatalysts with high efficiency and excellent durability remains a great challenge for the hydrogen-based energy industry. Here, we report fabrication of a unique hierarchically porous structure, i.e., nanoporous Ni (NPN)/metallic glass (MG) composite, through surface dealloying of the specially designed Ni40Zr40Ti20 MG wire. This porous composite is composed of micrometer slits staggered with nanometer pores, which not only enlarges effective surface areas for the catalytic reaction, but also facilitates the release of H2 gas. As a result, the NPN/MG hybrid electrode exhibited the prominent HER performance with a low overpotential of 78 mV at 10 mA cm-2 and Tafel slope of 42.4 mV dec-1, along with outstanding stability in alkaline solutions. Outstanding catalytic properties, combining with their free-standing capability and cost efficiency, make the current composite electrode viable for HER applications.

Key words: Nanoporous Ni, Dealloying, Metallic glasses precursor, Hierarchically porous structure, Hydrogen evolution reaction