Importance

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Abstract

In order to produce an electro-chemical unit for a fuel cell stack in which a plurality of electro-chemical units follow one another along a stacking direction wherein the electro-chemical unit includes a membrane electrode unit having an anode-side electro-chemically active surface which has an outer border that is defined by an anode-side bordering element and wherein the electro-chemical unit also includes a cathode-side electro-chemically active surface which has an outer border that is defined by a cathode-side bordering element in such a way as to prevent enhanced aging of the membrane electrode unit due to regions of the membrane electrode unit only being supplied with an oxidizing agent, it is proposed that the outer border of the anode-side electro-chemically active surface be displaced outwardly at least in sections thereof with respect to the outer border of the cathode-side electro-chemically active surface in a direction running perpendicularly to the stacking direction.

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First Claim