Bipolar membranes with fluid distribution passages

Chemistry: electrical and wave energy – Apparatus – Electrolytic

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204282, 204296, 429 30, 429 33, 429 38, C25B 900

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active

059617969

ABSTRACT:
The present invention provides a bipolar membrane and methods for making and using the membrane. The bipolar membrane comprises a cation-selective region, an anion-selective region, an interfacial region between the anion-selective region and the cation-selective region, and means for delivering fluid directly into the interfacial region. The means for delivering fluid includes passages that may comprise a fluid-permeable material, a wicking material, an open passage disposed within the membrane or some combination thereof. The passages may be provided in many shapes, sizes and configurations, but preferably deliver fluid directly to the interfacial region so that the rate of electrodialysis is no longer limited by the diffusion of fluid through the cation- or anion-selective regions to the interfacial region.

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Nonobe, Tasuhiro (Toyota Motor Co. Ltd. Japan), 1995, "Electrolyte membranes, their manufacture, and fuel cells," Elects Plus: Batteries & Fuel Cells, Issue I, 1996.

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