Cation-conducting or proton-conducting ceramic membrane based on a hydroxysilylic acid, method for the production thereof and use of the same

摘要

The invention relates to a cation- and/or proton-conducting membrane, to a process for producing it, and to its use. The membrane of the invention constitutes a new class of solid proton-conducting membranes. The basis is a porous and flexible ceramic membrane which is described in PCT/EP98/05939. The membrane is infiltrated with a proton-conducting material and then dried and solidified, so that ultimately an impervious, cation/proton-conducting membrane is obtained. The proton-conducting material is a hydroxysilylsulfonic or hydroxysilylphosphonic acid, which is bound into an inorganic network, e.g., SiO2. The ceramic membrane remains flexible and can be used without problems as a membrane in a fuel cell.