▎ 摘　　要

NOVELTY - Preparing composite electrode material involves preparing zinc oxide/graphene nanocomposite by mixing n-hexylpyridine hexafluorophosphate and carbon powder to obtain mixture. The obtained mixture is crushed to obtain black pasty solid, which is pressed into glass electrode tube to obtain base electrode (CILE). Oxidized graphene and lithium perchlorate are added into distilled water to obtain mixture, which is ultrasonically dispersed to form three-electrode system as working electrolyte. The base electrode (CILE) is fabricated with electrochemical deposition on its surface. USE - Method for preparing composite electrode material (claimed) used for supercapacitor. ADVANTAGE - The method enables to prepare composite electrode material, which has specific capacitance retention rate of 93% and good cycling stability. DETAILED DESCRIPTION - Preparing composite electrode material involves preparing zinc oxide/graphene nanocomposite by mixing n-hexylpyridine hexafluorophosphate and carbon powder to obtain mixture. The obtained mixture is crushed to obtain black pasty solid, which is pressed into glass electrode tube to obtain base electrode (CILE). Oxidized graphene and lithium perchlorate are added into distilled water to obtain mixture, which is ultrasonically dispersed to form three-electrode system as working electrolyte. The base electrode (CILE) is fabricated with electrochemical deposition on its surface. Zinc nitrate solution is used as electrolyte to keep temperature of the solution constant. Graphene/CILE is used as the working electrode, which is subjected to electrochemical deposition and then washed with distilled water. The obtained working electrode is dried to obtain zinc oxide-graphene-CILE nanocomposite material. The obtained zinc oxide-graphene-CILE nanocomposite material is dipped in potassium hydroxide solution as electrolyte to construct three-electrode system. The three-electrode system is attached with cyclic voltammograms to obtain constant-current charge-discharge curves at different potentials.