Conductive thin film forming proton conductive composition and proton conductive composite membrane

摘要

A tough proton-conducting composite membrane is obtained by applying a conductive thin-film forming proton-conducting composition containing at least a compound having proton conductivity and foliar silica secondary particles having a film-forming property to a substrate and drying. can get. The composition is preferably an aqueous slurry. As the compound having proton conductivity, an indefinite compound such as CsHSO4, (NH4) 3H (SO4) 2, NH4HSO4, CsH2PO4, or an organic polymer compound such as perfluorosulfonic acid polymer or sulfonated aromatic compound polymer is used. . This composite membrane is rich in film-forming properties, has a gas barrier property, and exhibits high proton conductivity even in dry air at 100 ° C. or higher. For example, it is suitably used as an electrolyte membrane for fuel cells.