Interface Engineering of an Ultrathin Hierarchical Phosphorus-Doped MoS2/Ni3S2 Heterostructure on Nickel Foam for Efficient Water Splitting

Rationallydesigned structures and elements are important for theconstruction of effective electrocatalysts for water splitting. Herein,we developed an ultrathin hierarchical P-doped MoS2/Ni3S2 heterostructure on nickel foam (NF) by a one-potsynthesis. Owing to its optimized electronic structure configurationand hierarchical structure with plenty of active sites, the optimizedcatalyst P-1.0-doped MoS2/Ni3S2/NF showed promising activity for both hydrogen evolutionreaction and oxygen evolution reaction in an alkaline medium requiringan overpotential of, respectively, 0.449 and 0.239 V at 100 mA cm(-2). Furthermore, the P-1.0-MoS2/Ni3S2/NF electrode was applied foroverall water splitting using a two-electrode system. The electrolyzerachieved low cell voltages of 1.50 and 1.65 V at current densitiesof, respectively, 20 and 40 mA cm(-2) with excellentstability over 60 h when compared with previously reported Ni3S2-based materials. The results obtained in thiswork highlight the prime combination of doping and interface engineeringfor the design of advanced materials in electrocatalysis.