Mo-doping heterojunction: interfacial engineering in an efficient electrocatalyst for superior simulated seawater hydrogen evolution.

Exploring economical, efficient, and stable electrocatalysts for the seawater hydrogen evolution reaction (HER) is highly desirable but is challenging. In this study, a Mo cation doped NiSe/MoSe heterostructural electrocatalyst, Mo-NiSe/MoSe, was successfully prepared by simultaneously doping Mo cations into the NiSe lattice (Mo-NiSe) and growing atomic MoSe nanosheets epitaxially at the edge of the Mo-NiSe. Such an Mo-NiSe/MoSe catalyst requires only 110 mV to drive current densities of 10 mA cm in alkaline simulated seawater, and shows almost no obvious degradation after 80 h at 20 mA cm.