Few-Layered WS Anchored on Co, N-Doped Carbon Hollow Polyhedron for Oxygen Evolution and Hydrogen Evolution.

Tungsten disulfide (WS) is well known to have great potential as an electrocatalyst, but the practical application is hampered by its intrinsic inert plane and semiconductor properties. In this work, owing to a Co-based zeolite imidazole framework (ZIF-67) that effectively inhibited WS growth, few-layered WS was confined to the surface of Co, N-doped carbon polyhedron (WS@CoS), with more marginal active sites and higher conductivity, which promoted efficient oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). For the first time, WS@CoS was prepared by mixing in one pot of a liquid phase and calcination, and WS realized uniform distribution on the polyhedron surface by electrostatic adsorption in the liquid phase.