| http://www.w3.org/ns/prov#value | - In a preferred embodiment of the present invention, in which the at least one additive is a constituent of the electrocatalytic layer 4 comprising at least one standard catalyst, the at least one additive is preferably present, based on the at least one standard catalyst, in a ratio by weight of from 1:10 to 1:0.5, particularly preferably in a weight ratio of from 1:5 to 1:1. [0030] In a further p
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