Porous biomass charcoal/Co(OH)2 composite electrode material and preparation method thereof

The invention discloses a porous biomass charcoal/Co(OH)2 composite electrode material and a preparation method thereof. The porous biomass charcoal/Co(OH)2 composite electrode material is prepared by the following steps: by taking food residue potato peel as a raw material, adding an activator potassium hydroxide and urea, fully mixing, dehydrating and carbonizing to prepare a porous biomass charcoal material, and growing on the surface of the porous biomass charcoal material by taking cobalt nitrate as a cobalt source and potassium hydroxide providing an alkaline condition, and then obtaining the porous biomass charcoal/Co(OH)2 composite electrode material. The porous structure material has a large specific surface area, and is beneficial to wetting of electrolyte and transmission and migration of carriers in an electrode material, so that the electrochemical performance of the carbon material is improved. When the electrode material is used as a working electrode, relatively high specific capacitance, exce