▎ 摘　　要

NOVELTY - Nonionic polymeric surfactant P123 and oxidized graphene are dispersed in deionized water, to form homogeneous dispersion. Soluble nickel salt and urea are added to homogeneous dispersion liquid and mixed, to form precursor solution. Pre-washed foamed nickel is immersed in precursor solution in hydrothermal reactor, hydrothermally reacted and graphene-nickel hydroxide composite is grown on foamed nickel substrate. The foamed nickel is taken out and placed in deionized water, ultrasonically cleaned and dried to obtain graphene-nickel hydroxide composite electrode. USE - Synthesis of graphene-nickel hydroxide composite electrode used for supercapacitor (claimed). ADVANTAGE - The method enables synthesis of graphene-nickel hydroxide composite electrode with high specific capacity and workability by simple and economical method. DETAILED DESCRIPTION - 0.1-0.3 g Nonionic polymeric surfactant P123 and 0.01-0.02 g oxidized graphene are ultrasonically dispersed in deionized water, to form homogeneous dispersion. Soluble nickel salt and 0.12-0.48 g urea are added to homogeneous dispersion liquid and mixed, to form precursor solution. The molar ratio of soluble nickel salt and urea is 1:1. The precursor solution is transferred to hydrothermal reactor, and pre-washed foamed nickel is immersed in precursor solution in hydrothermal reactor, hydrothermally reacted at 100-180 degrees C for 2-24 hours and graphene-nickel hydroxide composite is grown on foamed nickel substrate. After completion of the reaction, the foamed nickel is taken out and placed in deionized water, ultrasonically cleaned until the washing solution is colorless and dried to obtain graphene-nickel hydroxide composite electrode.