▎ 摘　　要

NOVELTY - Carbon substrate composite catalyst is loaded with cuprous oxide and reduced graphene oxide, and supports reduced graphene oxide coated cuprous oxide nanoparticles on a carbon substrate. The cuprous oxide nano-particles are spherical particles with the diameter of 300-500 nm. The thickness of the reduced graphene coating layer is 5-50 nm, preferably 5-20 nm. USE - Carbon substrate composite catalyst used for preparing batteries, electrode materials, field effect transistors, catalytic or energy materials, and electrocatalytic oxygen evolution (claimed). ADVANTAGE - The carbon substrate composite catalyst can stably exist in the air, where the composition and the performance of the original structure are analyzed by using characterization methods such as x-ray photoelectron spectroscopy, x-ray powder diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing carbon substrate composite catalyst, which involves: (A) preparing reduced graphene oxide; (B) preparing a carbon substrate loaded with reduced graphene oxide by a hydrothermal method; and (C) preparing cuprous oxide and graphene loaded carbon substrate composite catalyst by hydrothermal reduction method.