▎ 摘　　要

NOVELTY - Preparing composite electrode comprises (i) placing graphene oxide aqueous dispersion liquid with a concentration of 15-20 mg/g, preferably 38-42 mg/g at a temperature of 55-65℃, (ii) stirring the printing base material, vitamin C and conductive carbon black with mass ratio of 45-50:1.8-2:0.9-1 to obtain printing ink raw material, (iii) placing injector with printing ink raw material in 3D printer for 3D printing to obtain 3D printing electrode; the 3D printing parameters includes printing pattern is a square of 3-3.5×3-3.5 cm, (iv) freezing 3D printing electrode at -50 to -48℃ for 9-10 hours, vacuum drying the 3D printing electrode for 30-35 hours, and freeze-drying electrode at 90-95℃ for 2-3 hours, cooling, washing electrode with deionized water to obtain graphene-conductive carbon black composite gas gel, and (v) placing graphene-conductive carbon black composite gas gel in tubular furnace, heating to obtain graphene-conductive carbon black composite gas gel composite electrode. USE - The preparation method for composite electrode is useful for vanadium redox flow battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for composite electrode for vanadium redox flow battery prepared by above method.