Interface Engineering of Ultrathin Hierarchical P-Doped Mos2/Ni3s2 Heterostructure on Nickel Foam for Efficient Water Splitting

Abstract

Rationally-designed structures and elements are important for the construction of effective electrocatalysts for water splitting. Herein, we developed an ultrathin hierarchical P-doped MoS 2 /Ni 3 S 2 heterostructure on nickel foam (NF) by one-pot synthesis. Owing to its optimized electronic structure configuration and hierarchical structure with plenty of active sites, the selected catalyst P 1.0 -doped MoS 2 /Ni 3 S 2 /NF showed promising activity for both hydrogen evolution reaction (HER) and oxygen evolution (OER) in an alkaline medium requiring an overpotential of respectively 0.449 and 0.239 V at 100 mA/cm 2 . Furthermore, the P 1.0 -MoS 2 /Ni 3 S 2 /NF electrode was applied for overall water splitting using a two-electrode system. The electrolyzer achieved low cell voltages of 1.50 and 1.65 V at current densities of respectively 20 and 40 mA/cm 2 with excellent stability over 60 h when compared with previously reported Ni 3 S 2 -based materials. The results obtained in this work highlight the prime combination of doping and interface engineering for the design of advanced materials in electrocatalysis.

Keywords: MoS2/Ni3S2 heterostructure, P-doping, Water splitting, Alkaline medium, High stability