| abstract |
The present invention provides a membrane electrode assembly for a polymer electrolyte fuel cell that has a high initial output voltage and can maintain a high output voltage over a long period of time. The catalyst layer 4a for the anode and / or the catalyst layer 4b for the cathode of the membrane electrode assembly 10 has two or more molecules of crystal water with respect to zirconium atoms and has a two-dimensional layered structure. And zirconium phosphate having an amorphous structure, zirconium phosphate having crystal water and a three-dimensional network structure, and M 2y / l Zr (PO 4 ) 2y SiO 2 .nH 2 O {M is a hydrogen atom Alternatively, it represents a metal atom, and l represents a numerical value corresponding to the valence of M, and includes one or more of compounds represented by 0 <2y <1, n> 0}. [Selection] Figure 1 |