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High-pressure electrolysis
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<p>High-pressure electrolysis (HPE) is the <a href="/facts/Electrolysis_of_water/Vb0hYQPW">electrolysis of water</a> by decomposition of water (H2O) into oxygen (O2) and <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a> gas (H2) due to the passing of an electric current through the water. The difference with a standard <a href="/facts/Proton_exchange_membrane_electrolyzer/fpjWG9sF">proton exchange membrane (PEM) electrolyzer</a> is the <a href="/facts/Compressed_hydrogen/SgIHnnFc">compressed hydrogen</a> output around 12–20 megapascals (120–200 bar) at 70 °C. By pressurising the hydrogen in the electrolyser the need for an external <a href="/facts/Hydrogen_compressor/IdYDXH0P">hydrogen compressor</a> is eliminated, the average energy consumption for internal differential pressure compression is around 3%. </p>