▎ 摘　　要

NOVELTY - Preparation of three-dimensional graphene/cobalt hydroxide composite electrode involves mixing graphite powder and n-hexylpyridine hexafluorophosphate salt into carbon paste and filling carbon paste into a glass electrode tube to be compacted to obtain carbon paste electrode, taking mixed solution of graphene oxide and lithium perchlorate and ultrasonically dispersing and using mixed solution as electrolytic solution, carbon paste electrode as the working electrode to obtain three-electrode system. USE - Method for preparing three-dimensional graphene/cobalt hydroxide composite electrode (claimed) used for supercapacitor electrode material. ADVANTAGE - The product has good cycle stability. DETAILED DESCRIPTION - Preparation of three-dimensional graphene/cobalt hydroxide composite electrode comprises: (A) mixing graphite powder and n-hexylpyridine hexafluorophosphate salt into carbon paste and filling carbon paste into a glass electrode tube to be compacted to obtain carbon paste electrode; (B) taking mixed solution of graphene oxide and lithium perchlorate, ultrasonically dispersing and using mixed solution as electrolytic solution, carbon paste electrode as the working electrode to obtain three-electrode system, three-dimensional graphene on the surface of carbon paste electrode by potentiostatic deposition; (C) using cobalt nitrate solution as electrolyte and three-dimensional graphene-modified electrode as working electrode to obtain cobalt hydroxide nano-materials on the surface of three-dimensional graphene-modified electrode by potentiostatic deposition method, washing with distilled water and vacuum drying; and (D) using potassium hydroxide solution as electrolyte, using cobalt hydroxide/three-dimensional graphene-modified electrode/carbon paste electrode as working electrode, taking a different scan rate of cyclic voltammetry curve in a certain potential range, taking constant current charge and discharge curve in a certain potential range of different current density, taking constant current charge in a certain potential range with a large current density, discharging 3000 times and testing capacitance performance changes where frequency is 0.1-105 Hz and alternating current bias voltage is 10 mV.