PROTON CONDUCTOR, CELL STRUCTURE, METHODS FOR PRODUCING PROTON CONDUCTOR AND CELL STRUCTURE, FUEL CELL, AND WATER ELECTROLYSIS DEVICE

摘要

A proton conductor contains a metal oxide having a perovskite structure and represented by A_aB_bM_cO_3-δ (wherein: A is at least one of Ba, Ca, and Sr; B is at least one of Ce and Zr; M is at least one of Y, Yb, Er, Ho, Tm, Gd, and Sc; 0.85≤a≤1; 0.5≤b1; c=1-b; and δ is an oxygen deficiency amount), and a standard deviation in a triangular diagram representing an atomic composition ratio of the A, the B, and the M is not greater than 0.04.