Gas diffusion electrode for membrane fuel cells and method of its production
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United States of America Patent
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Jan 19, 1999
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app pub date -
Mar 24, 1997
filing date -
Mar 23, 1996
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Abstract
A porous gas diffusion electrode for membrane fuel cells on an ion-conducting polymer. The electrode contains a finely divided electrocatalyst which is dispersed in a proton-conducting ionomer and has a total porosity of more than 40 to less than 75%. It supplies considerably improved performance data in comparison to known electrodes. The electrode can be produced by using pore-forming materials which are dissolved during the re-protonation of the ion-conducting polymers with sulfuric acid or are decomposed by the action of temperature.
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