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000903678 1001_ $$0P:(DE-Juel1)180863$$aWolf, Stephanie$$b0
000903678 245__ $$aBoundary Investigation of High-Temperature Co-Electrolysis Towards Direct CO2 electrolysis
000903678 260__ $$aBristol$$bIOP Publishing$$c2022
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000903678 520__ $$aIn 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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000903678 7001_ $$0P:(DE-Juel1)171748$$aDittrich, Lucy$$b1
000903678 7001_ $$0P:(DE-Juel1)177600$$aNohl, Markus$$b2
000903678 7001_ $$0P:(DE-Juel1)166524$$aFoit, Severin$$b3
000903678 7001_ $$0P:(DE-Juel1)129936$$aVinke, Izaak C.$$b4
000903678 7001_ $$0P:(DE-Juel1)129952$$ade Haart, L. G. J.$$b5$$eCorresponding author
000903678 7001_ $$0P:(DE-Juel1)156123$$aEichel, Rüdiger-A.$$b6
000903678 773__ $$0PERI:(DE-600)2002179-3$$a10.1149/1945-7111/ac5e45$$n1$$pMA2021-03 215$$tJournal of the Electrochemical Society$$v103$$x0013-4651$$y2022
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