Abstract
Abstract It is shown experimentally that the gas produced on perforated plate electrodes in water electrolysis cells is generated in the gap between the electrode and the diaphragm. Under a minimum diameter of the perforations no gas evolution is observed; the bubbles block the perforations. For hydrogen evolving electrodes, this minimum diameter is about 200 μm. The gap between the diaphragm and the electrode should be of the same order of magnitude.
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