The identified intrinsic active sites for efficient and stable bi-functional catalyst N-MoS2·Ni3S2/NiS: the Mo–N structure and Ni–S structure on the heterogeneous interface synergistically enhance water splitting

N-MoS 2 ·Ni 3 S 2 /NiS with a specific Mo–N structure and a heterogeneous interface was synthesized through a self-catalysis strategy for efficient and stable water splitting.