Tuning electronic configuration of WP2 nanosheet arrays via nickel doping for high-efficiency hydrogen evolution reaction

Abstract

The strategies of heteroatom doping and morphology-controlled synthesis can synergistically enhance the activity of electrocatalytic hydrogen evolution. Modulate the electronic structure and surface energy by nanostructure and heteroatom doping is an efficient strategy to improve electrocatalytic activity of hydrogen evolution reaction (HER). Herein, nickel incorporated WP 2 self-supporting nanosheet arrays cathode was synthesized on carbon cloth (Ni-WP 2 NS/CC) by in-situ phosphating reduction of the Ni-doped WO 3 . It shows that heteroatom doping and the three-dimensional (3D) nanosheet arrays morphology both facilitate to reduce the interfacial transfer resistance and increase electrochemical-active surface areas, which effectively improve electrocatalytic hydrogen evolution reaction (HER) activity. The optimized catalyst, 1% Ni-WP 2 NS/CC, exhibits an outstanding electrocatalytic performance with an overpotential of 110 mV at 10 mA cm −2 and a Tafel slope of 65 mV dec −1 in the acid solution. DFT calculations further demonstrate the nickel doping can adjust the intrinsic structure of electronics, lower the Gibbs free energy of adsorption of hydrogen (Δ G H* ), and effectively improve the HER performance.