Electrodes with adjustable gas permeability, and method of producing such electrodes
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United States of America Patent
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Jan 15, 2008
Grant Date -
Jul 24, 2003
app pub date -
Dec 12, 2002
filing date -
Dec 14, 2001
priority date (Note) -
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Abstract
An electrode with adjustable gas permeability for electrochemical cells is formed by first and second laminated thin layers. The first serves for determining the overall gas permeability through the thickness of the electrode and conducting electricity. The second is for conducting electricity, supplying the reaction gases and removing the reaction products, and is a porous electricity-conducting material. The laminate consists of at least two materials of different gas permeability. The material with the higher gas permeability located on the side of the membrane forms the first layer, and the material with the lower gas permeability forms the second layer on the side away from the membrane. Openings are formed in the laminate towards the side adjacent to the membrane. The sidewalls of the openings in the area of the material with the higher gas permeability are at least partially covered by the material with the lower gas permeability.
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