▎ 摘　　要

NOVELTY - A composite comprises a graphene hydrogel, and boron-doped carbon quantum dots dispersed in and on the surface of the graphene hydrogel. USE - Composite is used for forming catalyst (claimed) for oxygen reduction reaction, oxygen evolution reaction and/or hydrogen evolution reaction. ADVANTAGE - The composite can be manufactured by simple and environmentally-friendly method. The composite is rich in active sites, and has high porosity and specific surface area, and excellent physical property, and stability even under alkaline conditions. The catalyst containing the composite has high electrolyte material transfer ability and ion diffusion ability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of the composite, which involves preparing a reaction intermediate by performing hydrothermal reaction of a mixture comprising glucose, boronic acid and graphene oxide, and reducing to disperse boron-doped carbon quantum dots in and on the surface of graphene hydrogel.