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

Molybdenum Sulfide (MoS2) represents an excellent performance non precious electrocatalyst for hydrogen evolution reaction (HER). There are some challenges to further improve the HER property of MoS2 owing to its inferior conductivity, serious aggregation and limited active sites. In this study, Ni0.15Co0.85S2@MoS2 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 (H24Mo7N6O24·4H2O) and thiourea (CH4N2S) to obtain a catalyst for HER. As expected, the optimized Ni0.15Co0.85S2@MoS2 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.