Preparation method and application of graphene gas diffusion electrode

The invention relates to the technical field of the preparation of an electrode material, in particular to a preparation method and application of a graphene gas diffusion electrode. The preparation method comprises the following steps: mixing flake graphite, NaNO3 and concentrated sulfuric acid in an ice bath to obtain a mixture, enabling the mixture to slowly react with KMnO4, adding 30 percent of H2O2 to react sufficiently, filtering, washing until the solution is neutral, and drying; ultrasonically dispersing a product in an aqueous solution to obtain a dispersion solution, adjusting the pH, centrifuging, collecting an upper layer of stable solution, adding an appropriate amount of hydrazine hydrate to obtain a graphene dispersion solution; uniformly mixing the dispersion solution with graphite powder, ethanol and PTFE emulsion; and keetping constant temperature in a water bath until the mixture is in thick paste shape, attaching the mixture onto a stainless steel net, and pressing to obtain the graphene