Biomass-based porous carbon electrode material and preparation method and application thereof

The invention belongs to the technical field of electrode materials, and discloses a biomass-based porous carbon electrode material and a preparation method and application thereof. The method comprises the following steps: 1) crushing and drying the biomass raw material corn cob residue; (2) carrying out hydrothermal reaction on the dried corn cob residues, filtering, washing and drying to obtain corn cob residue hydrothermal carbon; the temperature of the hydrothermal reaction is 220-260 DEG C, and the time of the hydrothermal reaction is 2-8 hours; and 3) uniformly mixing the corn cob residue hydrothermal carbon with potassium carbonate, and performing high-temperature activation, acid pickling, water washing and drying in a protective atmosphere to obtain the corn cob residue-based porous carbon electrode material. An electrode made of the electrode material is used for a super capacitor. The method is green and environment-friendly, the raw materials are cheap and easy to obtain, and resource utilization