Article (Special Issue on Celebrating the 40th Anniversary of Institute of Catalysis, Zhejiang University)Cobalt phosphide [email protected] mixed-metal phosphide nanotube hierarchical nanocomposites for enhanced overall water splitting

Add time:08/15/2019    Source:sciencedirect.com

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 [email protected] mixed-metal phosphide nanotubes (denoted [email protected]) 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 [email protected] 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 [email protected] 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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