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- W2120492106 abstract "The conversion of electric energy into chemical energy in form of pressurized hydrogen is currently discussed as promising option to handle intermittent electricity supply that occurs with the increasing use of renewable energy sources. Two classic concepts exist for the generation of high-pressure hydrogen: first, pressurisation of the feed water followed by a high-pressure electrolysis (path I) and second, electrolysis at ambient pressure and subsequent compression of the gaseous hydrogen (path II). In the newer literature a third method is discussed which involves the electrochemical co-compression during the electrolysis (path III, referred to as asymmetric high-pressure electrolysis). In this concept water is fed under ambient conditions to the anode while the cathode is maintained at the delivering pressure of hydrogen. In current experimental studies using solid polymer electrolysers, pressure differences between anode and cathode of up to 80 bar are reached (e.g. [1-2]). In the present theoretical contribution the three pathways have been energetically evaluated and compared which each other (see Figure). For hydrogen delivery pressures of up to30 bar asymmetric high-pressure water electrolysis (path III) slightly outperforms the two classic pathways. The main drawback of path I is the additional energy required for the generation of oxygen at elevated pressure. Path II mainly suffers from the non-isothermal mechanical compression and the associated mechanical losses. For increasing hydrogen delivery pressures path III is increasingly affected by hydrogen back-diffusion leading to a decrease of the Faradaic efficiency, which needs to be compensated by an increased power supply (see Figure)." @default.
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- W2120492106 date "2012-01-01" @default.
- W2120492106 modified "2023-09-26" @default.
- W2120492106 title "High pressure hydrogen production by means of asymmetric water electrolysis - A realistic option?" @default.
- W2120492106 hasPublicationYear "2012" @default.
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