▎ 摘　　要

NOVELTY - Preparing manganese dioxide/carbon nanotube modified graphene paper capacitor electrode comprises setting the voltage range is to -2-2 V using cyclic voltammetry, scanning for 100 sections, immersing the electrode in a mixed suspension of potassium permanganate and carbon nanotubes, magnetic stirring at the same time the deposition, setting voltage range of -2-2V, setting the sweep speed range of 50-250 mV/second and setting the number of scanning segments to 200 segments, performing electrodeposition of 200, removing the graphene- polyvinylidene fluoride composite film, rinsing and drying. USE - The method is useful for preparing manganese dioxide/carbon nanotube modified graphene paper capacitor electrode (claimed). DETAILED DESCRIPTION - Preparing manganese dioxide/carbon nanotube modified graphene paper capacitor electrode comprises (i) mixing reduced graphene oxide and polyvinylidene fluoride powder uniformly and dissolving in N, N-dimethylformamide solvent in a ratio of 1:5-1:10; (ii) dropping the solution obtained into a smooth silicon wafer, placing in a high temperature drying oven and drying at 150-170 degrees C, evaporating the solvent at high temperature to obtain graphene-polyvinylidene fluoride flexible film/silicon composite film; (iii) peeling tweezers graphene-polyvinylidene fluoride film from the surface of the wafer, obtaining graphene-polyvinylidene fluoride composite film and taking as super capacitor of the flexible base electrode; (iv) immersing the electrode in ethanol and ultrapure water for 4-6 minutes, removing the surface dirt, cleaning and drying the electrode; (v) taking flexible composite membrane as a working electrode, platinum as a counter electrode, saturated calomel electrode or silver/silver chloride electrode as a reference electrode, 0.2-0.4 mol/l potassium permanganate solution as the electrolyte, connecting the three electrodes to the electrochemical workstation and electrodepositing manganese oxide layer on the surface of flexible electrode using the cyclic voltammetry; (vi) setting the voltage range is to -2-2 V using cyclic voltammetry, setting the scan speed to 50-200 mV/s, scanning of 100 segments to restore deposition, rotating the electrode holder to 180 degrees and scanning for 100 sections, rinsing the surface residual solution with ultrapure water, blowing it dry with nitrogen and obtaining manganese oxide/graphene-polyvinylidene fluoride composite film; (vii) taking carbon nanotubes per milliliter 1 mg ratio, adding into 0.2 M of potassium permanganate solution and stirring to obtain ultrasound mixed suspension; (viii) drying the electrode with nitrogen, taking manganese oxide/graphene-polyvinylidene fluoride film as a working electrode and platinum as a counter electrode, building a two-electrode system, immersing the electrode in a mixed suspension of potassium permanganate and carbon nanotubes, magnetic stirring at the same time the deposition, setting voltage range of -2-2V, setting the sweep speed range of 50-250 mV/second and setting the number of scanning segments to 200 segments; and (ix) rotating the electrode at 180 degrees , performing electrodeposition of 200, removing the graphene- polyvinylidene fluoride composite film, rinsing and drying.