Patent ID: 8142917

Claim:
An electrode provided with a proton-conducting polymer coating which comprises polyazole blends and is obtained by a process (1) or (2) wherein process (1) comprises the steps A1) preparation of a mixture comprising polyphosphoric acid, at least one polyazole (polymer A) and/or one or more compounds which are suitable for forming polyazoles under the action of heat according to step B1), B1) heating of the mixture obtained according to step A1) under inert gas to temperatures of up to 400° C., C1) applying a layer using the mixture from step B1) to an electrode, D1) treating the electrode with the layer formed in step C1) with hydrolysis, or wherein process (2) comprises the steps A2) preparing a mixture comprising polyphosphoric acid, at least one polyazole (polymer A) and/or one or more compounds which are suitable for forming polyazoles under the action of heat according to step C2), B2) applying a layer using the mixture from step A2) to an electrode, C2) heating of the electrode with the layer obtained according to step B2) under inert gas to temperatures of up to 400° C., D2) treating the electrode with the layer in step C2) with hydrolysis, wherein at least one further polymer (polymer B) which is not a polyazole is added to the composition obtained according to step A1) or A2) and the weight ratio of polyazole to polymer B is in the range from 0.1 to 50.