| abstract |
PROBLEM TO BE SOLVED: To provide a nanofiber having high anion conductivity as a material capable of forming an optimum composite membrane as an electrolyte membrane of PEFC, a composite membrane using the nanofiber, a polymer electrolyte membrane, a fuel cell catalyst layer, and Providing a fuel cell. SOLUTION: A nanofiber containing an aromatic polymer, wherein the aromatic polymer has an anion exchange group, and the aromatic polymer includes A) an aromatic group in a main chain and / or a side chain. B) The anion exchange group is introduced into the aromatic group in the repeating unit, and the main chain skeleton of the aromatic polymer is composed of a polyarylene ether skeleton, a polyimide skeleton, and a polystyrene skeleton. Nano having a structure selected from the group, wherein the anion exchange group is an anion exchange group selected from the group consisting of a quaternary ammonium salt, a quaternary phosphonium salt, a tertiary sulfonium salt, and a quaternary boronium salt Fiber. [Selection] Figure 3 |