▎ 摘　　要

NOVELTY - A two-dimensional cobalt monoxide-cobalt diselenide-nitrogen-doped carbon nanotubes/reduced graphene oxide dual-function composite catalyst comprises cobalt monoxide nanoparticles, cobalt diselenide nanoparticles and nitrogen-doped carbon nanotubes which are co-loaded on a two-dimensional graphene sheet. USE - Two-dimensional cobalt monoxide-cobalt diselenide-nitrogen-doped carbon nanotubes/reduced graphene oxide dual-function composite catalyst is used for oxygen/hydrogen evolution of electrolyzed water (claimed). ADVANTAGE - The two-dimensional cobalt monoxide-cobalt diselenide-nitrogen-doped carbon nanotubes/reduced graphene oxide dual-function composite catalyst has high activity and stability, and is economically prepared by simple process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of two-dimensional cobalt monoxide-cobalt diselenide-nitrogen-doped carbon nanotubes/reduced graphene oxide dual-function composite catalyst, which involves mixing a cobalt salt, a nitrogen-containing organic small molecule compound and graphene oxide in a liquid phase, evaporating solvent, drying, obtaining a mixed powder, calcining the mixed powder in a protective atmosphere, placing obtained precursor and selenium powder in a protective atmosphere, and performing partial selenization.