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Temperature-induced changes in the synthesis gas composition in a high-temperature H2O and CO2 co-electrolysis system

Journal Article · · Applied Catalysis. A, General
Solid oxide electrolysis cell (SOEC) is an attractive renewable technology capable of producing synthesis gas (H2+CO) from H2O and CO2. An SOEC consists of a solid oxide electrolyte and two ceramic or metal-ceramic electrodes. H2O and CO2 are electrolyzed at the cathode producing H2 and CO, releasing O2- ions, which travel through the electrolyte to the anode side and recombine to produce pure oxygen gas as the byproduct. In the present study, a La0.7Sr0.2Ni0.2Fe0.8O3 cathode was used to co-electrolyze H2O and CO2 at three different operating temperatures- 700 °C, 750 °C and 800 °C. Synthesis gas was produced at all three operating temperatures with 100% Faradaic efficiency. The composition of the syngas, however, was found to be a function of the operating temperature. In general, the H2/CO ratio in the syngas decreased with increased temperature. This was partially due to CO2 electrolysis becoming more favorable compared to H2O electrolysis at higher temperatures.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); The Ohio State University, Columbus, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; FG02-07ER15896
OSTI ID:
1800424
Journal Information:
Applied Catalysis. A, General, Journal Name: Applied Catalysis. A, General Journal Issue: C Vol. 602; ISSN 0926-860X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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