Electrode for membrane-electrode assembly and method of manufacturing same

A method of manufacturing an electrode for a membrane-electrode assembly, comprising:

• preparing a porous substrate;
• forming the porous substrate comprising a first region and a second region having different thicknesses when viewed in a cross-section in a thickness direction by pressing the porous substrate using a press die;
• and
• incorporating an electrode slurry on the porous substrate,
• wherein the porous substrate comprises one or more selected from the group consisting of polytetrafluoroethylene (PTFE), ethylene/tetrafluoroethylene (ETFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer PFA), polyimide, polyester, and polyethylene terephthalate (PET),
• wherein the electrode slurry comprises a metal catalyst,
• wherein a thickness of the first region is greater than a thickness of the second region,
• wherein one surface of the porous substrate after the forming is flat and an opposite surface of the porous substrate after the forming is irregular depending on a shape of the first region and the second region,
• wherein the thickness of the first region is 5 to 10 μum and the thickness of the second region is 2 to 5 μm, and
• wherein, in incorporating the electrode slurry, a loaded amount (mg/cm2) of the metal catalyst is applied in a gradational manner over the thickness of the first region.