▎ 摘　　要

NOVELTY - Preparing scarlet flower-based graphene porous carbon nanosheet comprises washing the scarlet flower, drying, crushing to obtain dried scarlet powder; uniformly mixing the dried scarlet powder and encapsulating agent solution, evaporating the water to obtain encapsulated-protected raw material, carbonizing the encapsulated-protected raw material. USE - The nanosheet is used as electrode material of supercapacitor and high-rate performance supercapacitor. ADVANTAGE - The nanosheet: has large specific surface area and strong electrical conductivity; has high capacitance performance and long cycle life when used as supercapacitor electrode material; and is simple to prepare, safe, environmentally-friendly, and economical.