A Defective NiCo-pentlandite/black Phosphorus Heterostructure for Efficient Water Splitting Electrocatalysis

Herein, we report a nickel cobalt pentlandite/black phosphorus (Ni-Co9S8/BP) heterostructure as a bifunctional electrocatalyst, i.e., Ni doped Co9S8 vertically grown on the surface of black phosphorus. The nanoporous network heterostructure and surface sulfur vacancies endow Ni-Co9S8/BP with more active sites and accelerated reaction kinetics, thus realizing a low potential of 1.65 V at 10 mA cm-2 for water splitting, which outperforms most Co9S8-based electrocatalysts. A defective nickel cobalt pentlandite/black phosphorus heterostructure achieves highly active and durable water electrolysis through interface and heteroatom dual-engineering.