A 2D bimetallic Ni-Co hydroxide monolayer cocatalyst for boosting photocatalytic H 2 evolution.

Here, we report two-dimensional (2D) Ni-Co hydroxide monolayers (NiCo-HMs) as a highly active cocatalyst for enhancing the photocatalytic H 2 evolution of 2D g-C 3 N 4 nanosheets. The NiCo-HMs can expand the interface of electron migration, promote the separation of photogenerated carriers, provide synergistic Co-Ni active sites, and optimize atomic hydrogen adsorption to improve the kinetics of the catalytic reaction. The resulting 2D/2D NiCo-HMs/g-C 3 N 4 heterojunction displays a high photocatalytic H 2 evolution of 3.58 mmol g -1 h -1 .