▎ 摘　　要

NOVELTY - An eggshell membrane/graphene/polymer composite flexible supercapacitor preparing method involves adding sulfuric acid into three-necked flask, stirring an ice water bath, adding toner, sodium nitrate and potassium permanganate, stirring and heating, adding deionized water and hydrogen peroxide to remove excess potassium permanganate, washing with hydrochloric acid and deionized water, dispersing graphene oxide by sonication, purifying the eggshell membrane in a graphene oxide solution, preparing eggshell membrane/graphene oxide and adding hydrazine hydrate, and adjusting the pH to obtain eggshell membrane/graphene, immersing the graphene-attached protein membrane in ferric chloride solution, adding the pyrrole monomer and reacting in an ice water bath to obtain an eggshell membrane/graphene/polypyrrole composite material, using the eggshell membrane/graphene/polypyrrole composite material as an electrode material, immersing in a polymer electrolyte and drying. USE - Method for preparing eggshell membrane/graphene/polymer composite flexible supercapacitor. ADVANTAGE - The method enables preparing eggshell membrane/graphene/polymer composite flexible supercapacitor with better transmission resistance, improved electrochemical performance, larger specific capacitance and beneficial to electron transport in electrolyte. DETAILED DESCRIPTION - An eggshell membrane/graphene/polymer composite flexible supercapacitor preparing method involves adding 46-100 ml concentrated sulfuric acid into a 500 mL three-necked flask, stirring in an ice water bath at 0-3 degrees C, adding 0.5-4 g natural toner and 0.25-2 g sodium nitrate, and adding 6-12g potassium permanganate, controlling the reaction system temperature less than or equal to 20 degrees C, stirring continuously to the reaction for 2-4 hours, heating to 35 degrees C and keeping warm for 30-60 minutes, adding 90-180mL of deionized water, making the reaction system temperature less than or equal to 100 degrees C, after 15-30 minutes, adding deionized water, 5-10mL of 30% hydrogen peroxide to remove excess potassium permanganate, the reaction solution is bright yellow, washing with hydrochloric acid and deionized water until no sulfate, and using barium chloride solution detection, dispersing the graphene oxide by sonication to form a uniform suspension, purifying the eggshell membrane (1x 1 cm2) by a simple impregnation method in a graphene oxide solution for a suitable period of time, preparing eggshell membrane/graphene oxide and adding an appropriate amount of hydrazine hydrate, adjusting the pH of the solution to 10 with ammonia water and reacting for 1-3 hours to obtain eggshell membrane/graphene, immersing the graphene-attached protein membrane in the ferric chloride solution for 24 hours, adding the pyrrole monomer dropwise and reacting in an ice water bath for 6-12 hours to obtain an eggshell membrane/graphene/polypyrrole composite material, using the eggshell film/graphene/polypyrrole composite material as an electrode material of a supercapacitor, immersing in a polymer electrolyte for 5-10 minutes, drying and using a filter paper as a separator to assemble a symmetric supercapacitor.