Hauptseite > Publikationsdatenbank > Boundary Investigation of High-Temperature Co-Electrolysis Towards Direct CO2 electrolysis > print

001     903678
005     20240712112820.0
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037 _ _ |a FZJ-2021-05327
082 _ _ |a 660
100 1 _ |a Wolf, Stephanie
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245 _ _ |a Boundary Investigation of High-Temperature Co-Electrolysis Towards Direct CO2 electrolysis
260 _ _ |a Bristol
|c 2022
|b IOP Publishing
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520 _ _ |a In the temperature range of high temperature co-electrolysis of both steam and carbon dioxide, the reverse water-gas shift reaction (RWGS) takes place. Prior studies were conducted with a narrow gas composition range to investigate the role of RWGS during co-electrolysis. The results for steam electrolysis, CO2 electrolysis, and co-electrolysis caused different conclusions regarding the role of electrochemical CO2 and H2O conversion compared to RWGS during co-electrolysis. This work aims to resolve the role of CO2 conversion as part of RWGS in co-electrolysis. The boundary is characterized by AC and DC measurements over a broad gas composition range from CO2 electrolysis towards co-electrolysis with nearly 50%eq H2O. Especially, the electrochemical CO2 reduction and CO2 conversion in the RWGS are compared to clarify their role during co-electrolysis. The results revealed that gas composition determined the predominant reaction (H2O or CO2 reduction). The cell performance of co-electrolysis in the boundary region up to 5%eq H2O was similar to the performance of CO2 electrolysis. Up to 30%eq H2O, the performance increases with H2O concentration. Here, both CO2 and H2O electrolysis occur. Above 30%eq H2O, steam electrolysis and the RWGS reaction both dominate the co-electrolysis process.
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700 1 _ |a Dittrich, Lucy
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700 1 _ |a Nohl, Markus
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700 1 _ |a Foit, Severin
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700 1 _ |a Vinke, Izaak C.
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700 1 _ |a de Haart, L. G. J.
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700 1 _ |a Eichel, Rüdiger-A.
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773 _ _ |a 10.1149/1945-7111/ac5e45
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|t Journal of the Electrochemical Society
|v 103
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856 4 _ |u https://juser.fz-juelich.de/record/903678/files/Wolf_2022_J._Electrochem._Soc._169_034531.pdf
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