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STEP Ammonia ChemRxiv 2018.pdf (1.88 MB)

Solar Electrochemical Thermal Process (STEP) Ammonia: Optimization of the Electrolysis Conditions

preprint
submitted on 24.06.2018, 14:11 and posted on 25.06.2018, 14:03 by Fang-Fang Li, Richa Singhal, Jiawen Ren, Marcus Johnson, Matthew Lefler, Stuart Licht
In the solar thermal electrochemical process (STEP), sunlight is split into visible (for photovoltaic electricity) and thermal (unused, sub-bandgap) radiation using the full solar spectrum to efficiently drive high temperature electrolyzes. Electrolysis conditions for STEP ammonia are investigated. A mixed molten carbonate/hydroxide electrolyte with iron oxide catalyzes ammonia formation from water (steam) and air (nitrogen) via an iron intermediate. The higher temperature required for effective iron formation needs to be balanced by the lower temperature for effective hydration of the electrolyte. STEP ammonia is illustrated at a nickel anode and steel cathode at 650 °C in Li1.6Ba0.3Ca0.1CO3 with 6m LiOH and 1.5m Fe2O3.

Funding

National Science Foundation NSF grant 1505830

History

Email Address of Submitting Author

slicht@gwu.edu

Institution

George Washington University

Country

USA

ORCID For Submitting Author

0000-0002-8273-2875

Declaration of Conflict of Interest

no conflict of interest

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