▎ 摘　　要

NOVELTY - The membrane-electrode assembly (100) comprises a polymer electrolyte membrane (20) and a first catalyst layer (11) is stacked on the polymer electrolytic solution. A second catalyst layer (12) is stacked on first catalyst layer. The first catalyst layer includes a first catalyst and graphene oxide. The second catalyst layer comprises a second catalyst and a graphene oxide, and cathode electrodes (10) are provided with catalyst layers. The average particle size of a first ionomer included in the first catalyst layers is smaller than the average particles size of a second ionomer in the second catalyst layers. The content of the first ionomer is greater than the content of the second ionomer. USE - The membrane-electrode assembly is useful for fuel cell (claimed). ADVANTAGE - The assembly effectively discharges water generated by driving a fuel cell through an electrode having a stacked structure of a hydrophilic catalyst layer and a water repellent catalyst layer while excellently preserving a wet environment of an electrolyte membrane so as to improve fuel cell performance and durability through reduction of mass transfer resistance. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of membrane-electrode assembly. 10Cathode electrode 11First catalyst layer 12Second catalyst layer 20Polymer electrolyte membrane 100Membrane-electrode assembly