MEMBRANE-ELECTRODE UNIT FOR THE ELECTROLYSIS OF WATER

摘要

The invention relates to membrane-electrode units for the electrolysis of water ( electrolysis MEE's), which contain: an ion-conducting membrane having a front and rear side; a first catalyst layer on the front side; a first gas distributor substrate on the front side; a second catalyst layer on the rear side, and; a second gas distributor substrate on the rear side. The first gas distributor substrate has a two-dimensional extension that is smaller than the ion-conducting membrane, whereas the second gas distributor substrate has essentially the same two-dimensional extension as the ion-conducting membrane ("semi-coextensive design"). The MEE's also comprise an unsupported free membrane surface that yields improved adhesion properties of the sealing material. The invention also relates to a method for producing the MEE products. This results in obtaining pressure-resistant, gas-tight and cost-effective membrane-electrode units that are for use in PEM water electrolyzers, regenerative fuel cells or in other electrochemical devices.