▎ 摘　　要

NOVELTY - Preparing a boron-doped porous graphene cathode catalyst involves mixing graphene oxide powder with a solvent to obtain dispersion a, and adding template b to dispersion a to obtain dispersion c, and after adding hydrazine hydrate and ammonia to adjust the pH value, carrying out a solvothermal reaction, and then adding hydrogen chloride (HCl) to precipitate the mixture, filtering, washing, and drying to obtain a solid powder d. The solid powder d is heat-treated to obtain the porous reduced graphene oxide e. The heteroatomic boron precursor and the porous reduced graphene oxide are mixed uniformly, and reacted in a closed container to obtain the precursor f of the boron-doped porous graphene. The precursor f of the boron-doped porous graphene is heated in an inert gas, and obtain the boron-doped porous graphene cathode catalyst after cooling. USE - Method for preparing a boron-doped porous graphene cathode catalyst used as the cathode of lithium air battery (claimed). ADVANTAGE - The method enables to prepared a boron-doped porous graphene cathode catalyst, that has high porosity, large specific surface area and high conductivity, which is beneficial to the full diffusion of electrolyte solution and the transportation of oxygen, and with good specific capacity, electrochemical reversibility and stability, can be used as the cathode of lithium air battery.