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• W3107932085 abstract "Electrochemical hydrogen compression is seen as a promising alternative to mechanical compression in the context of power-to-gas plants. It can be carried out either as direct co-compression in a water electrolyzer (WE) or via a separate electrochemical hydrogen compressor (EHC). This study analyzes the specific energy demand of different hydrogen generation and compression pathways using WEs and EHCs, both based on proton exchange membrane (PEM) technology, for pressures up to <?CDATA $1000,{rm{bar}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>1000</mml:mn> <mml:mspace width=0.25em /> <mml:mrow> <mml:mi mathvariant=normal>bar</mml:mi> </mml:mrow> </mml:math> . The energy demand is systematically investigated as a function of design parameters such as pressure, current density, temperature and membrane thickness and presented in overpotential-specific and gas-crossover dependent shares. The analysis reveals intrinsic differences in the compression behavior of WEs and EHCs. In the EHC, permeated hydrogen is simply re-compressed back to the cathode. In the WE, instead, water has to be split again to compensate for the hydrogen loss, causing energetic disadvantages with increasing hydrogen pressure. Moreover, using an EHC enables design parameters to be optimized separately regarding hydrogen generation and compression. Therefore, at low current densities, compression via EHC is already favorable to co-compression via WE for pressures above <?CDATA $4,{rm{bar}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>4</mml:mn> <mml:mspace width=0.25em /> <mml:mrow> <mml:mi mathvariant=normal>bar</mml:mi> </mml:mrow> </mml:math> . With increasing current density, however, this intersection point shifts up to pressures above <?CDATA $200,{rm{bar}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>200</mml:mn> <mml:mspace width=0.25em /> <mml:mrow> <mml:mi mathvariant=normal>bar</mml:mi> </mml:mrow> </mml:math> ." @default.
• W3107932085 created "2020-12-07" @default.
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• W3107932085 date "2021-01-01" @default.
• W3107932085 modified "2023-10-18" @default.
• W3107932085 title "Energetic Evaluation and Optimization of Hydrogen Generation and Compression Pathways Considering PEM Water Electrolyzers and Electrochemical Hydrogen Compressors" @default.
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• W3107932085 doi "https://doi.org/10.1149/1945-7111/abcf1a" @default.
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