Method for manufacturing gaseous diffusion electrodes

H - Electricity – 01 – M

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H01M 4/88 (2006.01) C25B 11/00 (2006.01) H01M 4/86 (2006.01) H01M 4/90 (2006.01)

Patent

CA 2451610

With the help of a method for production of a gaseous diffusion electrode from a silver catalyst on PTFE-substrate, it is endeavoured to achieve results which can be reproduced, by avoiding the disadvantages of the state-of-the-art technology, whereby this is achieved in that - the porous system of the silver catalyst is filled with a wetted fluid; - a dimension-stable solid body with a grain size above that of the silver catalyst is mixed below the silver catalyst; - the thus compression-stable mass is shaped into a homogenous catalyst band in a calender; and - in a second calender step, an electrically conductive conductor material is imprinted into the catalyst band.

L'invention concerne un procédé servant à produire une électrode à diffusion gazeuse à partir d'un catalyseur à l'argent sur un substrat PTFE. L'invention vise à obtenir une reproductibilité des résultats en évitant les inconvénients de l'état de la technique. A cet effet, le système de pores du catalyseur à l'argent est rempli d'un liquide mouillant, un corps solide à dimension stable ayant une grosseur de grain supérieure à celle du catalyseur à l'argent est mélangé au catalyseur à l'argent, cette matière rendue ainsi stable à la compression est façonnée dans une calandre en une bande de catalyseur homogène et un matériau de dérivation électroconducteur est incrusté dans la bande de catalyseur lors d'une deuxième étape de calandrage.

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