Metal organic framework derived Ni0.15Co0.85S2@MoS2 heterostructure as an efficient and stable electrocatalyst for hydrogen evolution

Molybdenum Sulfide (MoS 2 ) represents an excellent performance non precious electrocatalyst for hydrogen evolution reaction (HER). There are some challenges to further improve the HER property of MoS 2 owing to its inferior conductivity, serious aggregation and limited active sites. In this study, Ni 0.15 Co 0.85 S 2 @MoS 2 hybrids are successfully synthesized in a simple hydrothermal method, where Ni-Co Metal Organic Frameworks (NiCo-MOFs) are served as precursors, which hydrothermally react with ammonium molybdate tetrahydrate (H 24 Mo 7 N 6 O 24 ·4H 2 O) and thiourea (CH 4 N 2 S) to obtain a catalyst for HER. As expected, the optimized Ni 0.15 Co 0.85 S 2 @MoS 2 catalyst presents ultrahigh HER property, a low overpotential of 79 mV at 10 mA cm −2 and a Tafel slope of 52 mV dec −1 can be observed in 1.0 M KOH, accompanied by excellent stability. This result displayed in our study could give a new strategy for designing and synthesizing more economical electrocatalysts based on MOFs as precursors in the future.