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High-pressure electrolysis
High-pressure electrolysis (HPE) is the electrolysis of water by decomposition of water (H2O) into oxygen (O2) and hydrogen gas (H2) due to the passing of an electric current through the water.〔(High pressure electrolysis )〕 The difference with a standard proton exchange membrane electrolyzer is the compressed hydrogen output around 〔(2001-High pressure electrolysis – The key technology for efficient H.2 )〕 at 70 °C.〔(Investigations of hydrogen compressor based on proton exchange membrane )〕 By pressurising the hydrogen in the electrolyser the need for an external hydrogen compressor is eliminated, the average energy consumption for internal differential pressure compression is around 3%.〔(2003-PHOEBUS-Pag.9 )〕
==Approaches==
As the required compression power for water is less than that for hydrogen-gas the water is pumped up to a high-pressure,〔(Prediction of production power for high-pressure hydrogen by high-pressure water electrolysis )〕 in the other approach differential pressure is used.〔(Differential pressure )〕
There is also an importance for the electrolyser stacks to be able to accept a fluctuating electrical input, such as that found with renewable energy.〔http://www.itm-power.com/tech/electrolyser-stacks/〕 This then enables the ability to help with grid balancing and energy storage.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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