▎ 摘　　要

NOVELTY - Preparation of graphene-based supercapacitor involves treating natural flaky graphite with strong acid, rapidly expanding at 900-1000 degrees C, ultrasonically stripping for 6-8 hours, washing and drying. USE - Preparation of graphene-based supercapacitor electrode. ADVANTAGE - The method provides a two-dimensional graphene-based supercapacitor electrode with excellent conductivity, large specific surface area and multiple adsorption active points, and excellent capacitance.