ELECTROLYTE FILM AND FUEL CELL

摘要

[PROBLEMS] To provide, in an electrolyte film for a fuel cell having a structure wherein the inside of pores of a porous substrate is filled with an electrolytic polymer, an electrolyte film exhibiting fuel cell performance capabilities at the highest level among those films having the same film thickness and the same porosity of a substrate and having the same amount of an electrolyte packed in the porous substrate. [MEANS FOR SOLVING PROBLEMS] A polymer electrolyte film wherein pores of a porous substrate are filled with an electrolytic polymer, characterized in that it exhibits a ratio of the maximum value to the minimum value (the maximum value/the minimum value) of the ion conductivity in the range of 1 to 1.5, when the ion conductivity is measured in the plane direction.