초록 ▼

A diaphragm for alkaline electrolysis, specifically for alkaline electrolysis of water, comprises a fine-pored, predominantly ceramic layer, which is preferably supported by a superficially oxidized structural framework or mesh. The diaphragm in use is sandwiched between two electrodes and is provid

A diaphragm for alkaline electrolysis, specifically for alkaline electrolysis of water, comprises a fine-pored, predominantly ceramic layer, which is preferably supported by a superficially oxidized structural framework or mesh. The diaphragm in use is sandwiched between two electrodes and is provided, on one or both sides, with fairly coarse-grained protuberances distributed over the surface and embedded into the fine-pored predominantly ceramic layer, which grains project out of the diaphragm surface. In view of the projection of the grains to form protuberances, and in spite of the fact that the adjacent electrodes are in contact with the diaphragm, a certain minimum distance is maintained between the diaphragm and each electrode, whereby, deposits on the electrodes, caused by unavoidable corrosion phenomena within the electrolysis apparatus, cannot propagate into the diaphragm. These coarse grains, about 10-250 microns in size, are thinly distributed over the diaphragm surface during the manufacture of the diaphragm before sintering, and are caused to be embedded in the surface with a slight application of pressure, so that they stick out in the form of “nubs”, resulting in reduced energy consumption during electrolysis.

대표청구항 ▼

An electrically isolating diaphragm for use between at least two contacting electrodes for alkaline electrolysis, said diaphragm comprising: a fine-pored predominantly ceramic layer-like structure having at least one fine-pored side surface; said ceramic structure having a plurality of protuberances

An electrically isolating diaphragm for use between at least two contacting electrodes for alkaline electrolysis, said diaphragm comprising: a fine-pored predominantly ceramic layer-like structure having at least one fine-pored side surface; said ceramic structure having a plurality of protuberances projecting outwardly by a predetermined dimension from said at least one fine-pored side surface of said ceramic structure; said predetermined dimension defining a spacing between said at least one fine-pored side surface and one of said contacting electrodes; and said protuberances comprising a plurality of coarse grains of known dimensional size partially embedded in said at least one fine-pored side surface of said ceramic structure.