METHOD FOR MANUFACTURING CATALYST INK FOR FUEL CELL, METHOD FOR MANUFACTURING CATALYST LAYER FOR FUEL CELL, AND METHOD FOR MANUFACTURING MEMBRANE ELECTRODE ASSEMBLY FOR FUEL CELL

摘要

PROBLEM TO BE SOLVED: To make it possible to easily adjust storage elastic modulus of a gelled ionomer solution to 150 Pa or above.SOLUTION: A method for manufacturing a catalyst ink for a fuel cell comprises the steps of: (i) preparing a catalyst dispersion liquid by mixing an electrode catalyst, water, and alcohol; (ii) preparing a gelled ionomer solution by mixing ionomer and a solvent; and (iii) manufacturing a catalyst ink by mixing the catalyst dispersion liquid and the gelled ionomer solution. The step (ii) includes a step of concentrating the gelled ionomer solution after mixing ionomer and the solvent.