METHOD FOR PRODUCING INK FOR USE IN FORMING ELECTROLYTE LAYER OF FUEL CELL

A method for producing an ink for use in forming an electrolyte layer of a fuel cell according to an embodiment of the present invention includes: a crushing step of crushing a cerium-containing oxide powder to obtain a cerium-containing oxide fine powder; a first mixing step of mixing and stirring the cerium-containing oxide fine powder, an ionomer, and water to obtain a first mixed liquid; a second mixing step of mixing and stirring the first mixed liquid and 1-propanol to obtain a second mixed liquid; and an ultrasonic treatment step of performing an ultrasonic treatment on the second mixed liquid.