Water Electrolysis

The most common way of splitting water is by electrolysis, though it can also be done using a thermochemical reaction or simply by heating. Electrolysis at a small scale can be carried out almost anywhere - passing a current through water is sufficient to generate a few bubbles of hydrogen at the cathode and oxygen at the anode. In order to make it efficient an electrolyte is required - an alkali such as potassium hydroxide is often used - and efficiencies of about 90% are standard [96]. Research into high temperature and polymer electrolyte electrolysers is progressing with the hope that these may be cheaper or more efficient than the current technology. Table B-1 shows the present development of electrolyzers.

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