▎ 摘　　要

NOVELTY - A nano silver-manganese dioxide modified graphene composite oxygen reduction catalyst comprises porous manganese dioxide modified three-dimensional graphene, silver nitrate and sodium borohydride in mass ratio of 100:6-18:1.5-3. USE - Nano silver-manganese dioxide modified graphene composite oxygen reduction catalyst. ADVANTAGE - The oxygen reduction catalyst has excellent catalytic activity, high specific surface area, and three-dimensional conductive network, which improves the conductivity of the catalyst, and promotes the transmission and diffusion of electrons under the synergistic effect of nano-silver and alpha -manganese dioxide. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the nano silver-manganese dioxide modified graphene composite oxygen reduction catalyst, which involves adding porous manganese dioxide modified three-dimensional graphene and silver nitrate to distilled water solvent, ultrasonically dispersing, adding sodium borohydride as reducing agent, heating to 50-70 degrees C for 1-3 hours, filtering, washing and drying.