Patent ID: 8202662

Claim:
A manufacturing method of a membrane electrode assembly which has catalytic layers on both surfaces of a polymer electrolyte membrane, the method comprising: coating a catalyst ink, which contains catalyst loading particles, a polymer electrolyte and a solvent, on a single surface of each of two base substrates; arranging a polymer electrolyte membrane between said two base substrates in such a way that each of said base substrate's surfaces on which said catalyst ink is coated faces said polymer electrolyte membrane; transferring said catalyst ink coated on said two base substrates to both surfaces of said polymer electrolyte membrane to form said catalytic layers; and peeling said two base substrates, which are attached to both sides of said polymer electrolyte membrane via said catalytic layers, off from said polymer electrolyte membrane and said catalytic layers, each surface roughness (SRa) of said catalytic layers formed on said polymer electrolyte membrane after said peeling process being in the 0.01-1.00 μm range, each gloss value at 85° (cf. JIS (Japanese Industrial Standard) Z 8741) of a surface of said catalytic layers being in the 10-80% range.