Citation:
Xiaowei Hu, Yongheng Yin, Wei Liu, Xingwang Zhang, Hongxiu Zhang. Cobalt phosphide nanocage@ferric-zinc mixed-metal phosphide nanotube hierarchical nanocomposites for enhanced overall water splitting[J]. Chinese Journal of Catalysis,
;2019, 40(7): 1085-1092.
doi:
S1872-2067(19)63299-7
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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.
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Keywords:
- Hierarchical structure,
- Phosphide,
- Electrocatalysis,
- CoP@ZnFeP,
- Water splitting
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