POLYELECTROLYTE MATERIAL, POLYELECTROLYTE COMPONENT, MEMBRANE ELECTRODE COMPOSITE BODY, AND POLYELECTROLYTE TYPE FUEL CELL

摘要

A polyelectrolyte material, a polyelectrolyte component, a membrane electrode composite body, and a polyelectrolyte type fuel cell. The above material is used in the above fuel cell or the like as the above component or the composite body. In addition to a conventional fuel cell using hydrogen gas as a fuel, a direct type fuel cell using methanol as a fuel is also attracting our attention. Although a material having performances excellent in proton conductivity and excellent in methanol shielding property and mechanical strength is required for the direct type fuel cell, the conventional material is short of satisfying the requirements. The above material is immersed in 1-30 wt.% methanol solution at 40-80æC for 12 hours, and then is immersed in pure water at 20æC for 24 hours to obtain a polyelectrolyte material having Rw, represented by the following expression, of 75-100 wt.% and an ionic radical in a water-containing state immediately after pulled up, whereby the above problems are solved. Rw= [Wnf/(Wfc+Wnf)] × 100, in the expression, Wnf: non-frozen water amount per weight one gram of dry polyelectrolyte material Wfc: low-melting point water amount per weight one gram of dry polyelectrolyte material