Energy Storage with Molten Metal Oxide

Thursday, October 20, 2011: 1:20 PM
206 A/B (Minneapolis Convention Center)
Ashay D. Javadekar1, Sounak Roy1, Abhimanyu Jayakumar2, Douglas Buttrey1, John Vohs2 and Raymond J. Gorte2, (1)Chemical Engineering, University of Delaware, Newark, DE, (2)Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA

Energy storage will play a critical role for electrical power generation as we move towards using renewable resources, since many renewable energy sources are intermittent in nature. Reversible fuel cells have been proposed as a possible way to store energy; however, energy losses associated with the conversion between H2O and H2 and the volumes required for storing H2 are serious impediments to this technology. To solve these problems, we propose to use the electrochemical oxidation of Sb and reduction of Sb2O3 in a solid oxide fuel cell (SOFC) as a means of energy storage. Both Sb (m.p. 903K) and Sb2O3 (m.p. 929K) are molten at typical SOFC operating temperatures (e.g. 973K). Furthermore, initial data for Sb electrode overpotentials indicates that these losses are very low. Although the Nernst potential for Sb-Sb2O3 equilibrium is relatively low, this is inconsequential for the energy-storage application. Finally, the volume associated with 1MW-h of energy is only 45 liters, based on cell performance that has already been achieved. The main goals of work in this area are to understand how cell performance is affected by Sb-Sb2O3 conversion. Mixing the metal and oxide phases is found to be a critical factor in determining cell performance.

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See more of this Session: Sustainable Electricity: Generation, Transmission, and Storage
See more of this Group/Topical: Sustainable Engineering Forum