MOF-Derived Ni3S2/MoS2 Nanospheres as Efficient Bifunctional Electrocatalyst for Overall Water Splitting

초록

Electrochemical water splitting has been considered as a prospective energy conversion technology because of its environmental friendliness and sustainable features. Developing efficient bifunctional electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is crucial to improve the system performance. Among the various potential candidates, transition metal dichalcogenides (TMDs)-based materials have attracted much interest owing to their abundance, durability, and high electrocatalytic activities. Herein, hetero-structured Ni3S2/MoS2 hollow nanosphere was synthesized by sulfurization of bimetallic Ni-Mo metal organic frameworks (MOFs). As-synthesized NiS2/MoS2 nanosphere electrocatalyst exhibited low overpotential and outstanding long-term stability for both HER and OER in 1 M KOH alkaline electrolytes. These outstanding electrochemical performances were mainly attributed to synergistic effect of the various chemical composition, abundant exposed active site of heterointerfaces, and high electrochemical active surface area. This work suggests a new strategy to synthesize MOF-derived heterostructure as an efficient bifunctional electrocatalyst for overall water electrolysis.