▎ 摘　　要

NOVELTY - Preparation of self-doping graphene comprises taking fresh vegetable, cleaning with water, treating, cutting into blocks, and soaking in potassium hydroxide; taking out and vacuum freeze-drying; weighing, activating under inert gas protection atmosphere, and cooling; grinding, washing with water until neutral, and vacuum filtering; and vacuum drying. USE - Method for preparing self-doping graphene (claimed). ADVANTAGE - The graphene uses rich source, cheap, and renewable raw materials, has carbon content of 80-95 at.%, is rich in amino acids and minerals, contains nitrogen content of 0.5-6.0 at.% and phosphorus content of 0.1-3.0 at.%, and has adjustable energy band gap conductivity type, improved free carrier density, enhanced stability and conductivity, and high activity.