Membrane electrode and preparation method and application thereof

The invention relates to the field of fuel cells, and provides a membrane electrode which comprises a fuel cell chip provided with a cathode catalyst layer and an anode catalyst layer, and a gas diffusion layer, the cathode catalysis layer comprises a plurality of cathode catalysis areas which are connected with one another; the flowing direction from the air inlet of the proton exchange membrane to the air outlet of the proton exchange membrane is taken as a first direction; in the same cathode catalysis area, the loading capacity of the platinum-carbon catalyst is uniform, the mass ratio of the ion resin to the carbon content in the platinum-carbon catalyst is uniform, and the platinum content in the platinum-carbon catalyst is uniform; the loading capacity of the platinum-carbon catalyst in the cathode catalyst layer, the mass ratio of the ion resin to the carbon content in the platinum-carbon catalyst and the platinum content in the platinum-carbon catalyst are gradually reduced in the first direction, on