Cathode structure of fuel cell

A cathode structure of a fuel cell, comprising:

• a cathode diffusion layer, wherein an air permeability adjusting structure is arranged around the cathode diffusion layer, and a cathode air permeability of the air permeability adjusting structure gradually varies along with fluid flow, wherein:
• the air permeability adjusting structure includes:
• a mixed layer between the cathode diffusion layer and a catalyst layer through which cooling fluid flows from a cooling fluid inlet at a back side to a cooling fluid outlet at a front side, and
• a flow channel layer having a plurality of flow channels adjacent to the cathode diffusion layer through which oxygen-supply air flows horizontally from an oxygen-supply air flow inlet to an oxygen-supply air flow outlet,
• wherein the cooling fluid and the oxygen-supply air flow through physically separate pathways, such that:
• the cooling fluid flows through density regions in the mixed layer having decreasing air permeability from the cooling fluid inlet to the cooling fluid outlet, and
• the oxygen-supply air flows through the flow channels having increasing air permeability from the oxygen-supply air flow inlet to the oxygen-supply air flow outlet.