Membrane electrochemical cell provided with gas diffusion...

H - Electricity – 01 – M

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H01M 8/02 (2006.01) C25B 9/04 (2006.01) C25B 9/20 (2006.01)

Patent

CA 2207425

The present invention refers to an electrochemical cell or stack of cells comprising two end-plates (7), bipolar plates (1) made of metal or metal alloy, gas permeable metal distributors (2), metal current collectors(3), gasket frames (4) provided with channels for feeding the gaseous reactants and discharging the excess reactants and condenses, a couple of gas diffusion electrodes, (5), an ion-exchange membrane (6), wherein said current conductors provide for a highly distributed segmented contact area on the electrode surface without isolated peaks and have an extremely smooth surface without asperities and at the same time porous and permeable to the gas flow.

La présente invention consiste en un élément ou en un ensemble d'éléments électrochimiques comprenant deux plaques d'extrémité (7), des plaques bipolaires (1) en métal ou en alliage métallique, des distributeurs métalliques perméables au gaz (2), des collecteurs métalliques de courant (3), des cadres de joints d'étanchéité (4) munis de canaux pour alimenter les réactifs gazeux et décharger les réactifs et les condensés excédentaires, des électrodes de diffusion des gaz (5), une membrane d'échange d'ions (6), dans laquelle des conducteurs d'électricité offrant une grande surface de contact segmentée sur la surface d'électrodes sans crêtes isolées et ayant une surface très lisse sans aspérités ainsi que poreuses et perméables au gaz.

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