Membrane electrode assembly, manufacturing method thereof and fuel cell

A method for manufacturing a membrane electrode assembly (MEA) comprising:

• coating a catalyst ink for forming a first electrode catalyst layer which comprises a catalyst loaded electron conducting material, a polymer electrolyte and a solvent on a substrate to form a first coated layer;
• evaporating said solvent in said first coated layer to form at least one layer of at least two first electrode catalyst layers which have a difference in polymer electrolyte content ratio;
• coating an ink for forming a filler layer which comprises a no-catalyst loaded electron conducting material or catalyst loaded electron conducting material, a polymer electrolyte and a solvent on said at least one layer of said at least two first electrode catalyst layers to form a coated filler layer;
• evaporating said solvent in said coated filler layer to entirely form said at least two first electrode catalyst layers which have a difference in polymer electrolyte content ratio by forming said filler layer on said at least one layer of said at least two first electrode catalyst layers;
• coating an electrolyte ink which comprises a polymer electrolyte and a solvent on said first electrode catalyst layer to form an electrolyte coated layer;
• evaporating said solvent in said electrolyte coated layer to form a polymer electrolyte layer;
• coating a catalyst ink for forming a second electrode catalyst layer which comprises said catalyst loaded electron conducting material, said polymer electrolyte and said solvent on said polymer electrolyte layer to form a second coated layer;
• and
• evaporating said solvent in said second coated layer to form a second electrode catalyst layer.