Membrane electrode assembly for water electrolysis and method for manufacturing the same

A method for manufacturing a membrane electrode assembly for water electrolysis, the method comprising:

• preparing an electrolyte membrane sheet including an existing back sheet and a solid electrolyte membrane attached to the existing back sheet, the solid electrolyte membrane including a solid electrolyte layer and a functional layer provided on a surface of the solid electrolyte layer opposite to the existing back sheet;
• attaching a fresh back sheet to a surface of the solid electrolyte membrane near the functional layer through thermocompression bonding by laminating the electrolyte membrane sheet and the fresh back sheet to form a laminate such that the fresh back sheet is in contact with the surface of the solid electrolyte membrane near the functional layer, and heating the laminate while pressurizing the laminate from both sides in a laminating direction;
• peeling the existing back sheet from the solid electrolyte membrane;
• forming a cathode catalyst layer on a surface of the solid electrolyte membrane opposite to the functional layer after the peeling of the existing back sheet;
• peeling the fresh back sheet from the solid electrolyte membrane after the forming of the cathode catalyst layer;
• and
• forming an anode catalyst layer on the surface of the solid electrolyte membrane near the functional layer after the peeling of the fresh back sheet.