Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (7): 1085-1092.DOI: 10.1016/S1872-2067(19)63299-7

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Cobalt phosphide nanocage@ferric-zinc mixed-metal phosphide nanotube hierarchical nanocomposites for enhanced overall water splitting

Xiaowei Hua, Yongheng Yina, Wei Liua, Xingwang Zhangb, Hongxiu Zhanga   

  1. a Key Laboratory of Functional Nanomaterials and Technology in Universities of Shandong, School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, Shandong, China;
    b Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2018-11-29 Revised:2019-01-09 Online:2019-07-18 Published:2019-05-24
  • Supported by:

    This work was supported by the Natural Science Foundation of Shandong Province (ZR2018BB061, ZR2018BB060, ZR2018LB004).

Abstract:

Hierarchical nanostructures have attracted widespread interest owing to their unique properties compared to their bulk counterparts. Thus, they are considered promising electrocatalytic materials. In this work, a novel hierarchical porous nanocomposite of cobalt phosphide nanocage@ferric-zinc mixed-metal phosphide nanotubes (denoted CoP@ZnFeP) was fabricated using a self-assembly approach. Because of their structural and compositional merits, the as-prepared phosphide hybrids have abundant catalytic active sites and high porosity for facile mass diffusion. In an alkaline electrolyte, the CoP@ZnFeP flower-like hybrids displayed enhanced catalytic activity for the hydrogen evolution reaction and the oxygen evolution reaction compared with a mechanical mixture of CoP and ZnFeP nanoparticles. The CoP@ZnFeP hierarchical nanocomposites also showed excellent activity for the overall water splitting reaction, yielding a water-splitting current of 10 mA/cm2 on the application of just 1.6 V, as well as excellent durability (24-h long-term operation) in a two-electrode system. Our design methodology may create opportunities to search for highly efficient and robust non-precious metal catalysts with applications in high-performance energy conversion and storage devices.

Key words: Hierarchical structure, Phosphide, Electrocatalysis, CoP@ZnFeP, Water splitting