▎ 摘　　要

NOVELTY - A composite material comprises a graphene layer and a porous nickel ferrite layer covers both surfaces of the graphene layer. USE - Composite material used in electrode material for primary or secondary electrochemical power generator, high-energy power generator, electrochemical luminescence modulation system, lithium-ion battery, sodium-ion battery and potassium-ion battery (all claimed). ADVANTAGE - The composite material has excellent electrical property. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite material, which involves (1) coating two surfaces of graphene layer with porous silicon dioxide layer to obtain graphene doped porous silicon dioxide, (2) coating both surfaces of graphene doped porous silicon dioxide with nickel ferrite layers to obtain graphene-doped porous silicon dioxide-doped nickel ferrite layers and (3) etching graphene-doped porous silicon dioxide-doped porous nickel ferrite.