High-performance carbon-based substrate for supercapacitor and preparation method thereof

The invention discloses a high-performance carbon-based substrate for a supercapacitor and a preparation method thereof. The preparation method comprises the following steps that (1), a carbon cloth is soaked with absolute ethyl alcohol, then washed with deionized water, and then drying is conducted at a constant temperature; (2), the carbon cloth is subjected to high temperature heating treatment, and the heating process is performed under oxygen protection; (3), the carbon cloth obtained after oxidation is placed in aqua regia for soaking, washed with deionized water and then subjected to constant temperature drying treatment; (4), then the cloth is soaked in an aluminum chloride-containing sodium borohydride solution, washed with deionized water under ultrasonication and then dried; (5), then the cloth is soaked in a potassium permanganate solution, washed under the acidic condition of hydrogen peroxide, washed with deionized water and then dried at a constant temperature to obtain a high-performance carbo