Membrane electrode and preparation method thereof

The invention relates to the technical field of fuel cells, and particularly discloses a membrane electrode and a preparation method thereof. The membrane electrode comprises a modified SPEEK membrane, a cathode and an anode, the preparation method of the modified SPEEK membrane comprises the following steps: S1, cleaning and drying PEEK resin, adding the PEEK resin into concentrated sulfuric acid, dissolving, carrying out a heating reaction, adding a reaction solution into an ice-water mixture, precipitating, cleaning a precipitate, and drying to obtain SPEEK resin; s2, adding SPEEK resin and multi-walled carbon nanotubes into DMF, mixing, and carrying out curtain coating and drying on the mixed solution to obtain an SPEEK film; s3, the SPEEK membrane is sequentially subjected to soaking treatment through NaBH4 and H2SO4 solutions, filtering is conducted to remove filtrate, washing and drying are conducted, and the modified SPEEK membrane is obtained. The membrane electrode provided by the invention contains