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Published June 2016 | Supplemental Material
Journal Article Open

Implications of Exceptional Material Kinetics on Thermochemical Fuel Production Rates

Abstract

Production of chemical fuels by solar-driven thermochemical cycling has recently generated significant interest for its potential as a highly efficient method of storing solar energy. Of particular interest is the thermochemical process using non-stoichiometric oxides, such as ceria. In this process a reactive oxide is cyclically exposed to an inert gas, typically at 1500 °C to induce the partial reduction of the oxide, and then exposed to an oxidizing gas of either H_2O or CO_2 at a temperature between 800–1500 °C to oxidize the oxide and release H_2 or CO. Conventional wisdom has held that material kinetics limit the fuel production rates. Herein we demonstrate that, instead, at 1500 °C the rates of both reduction and oxidation of ceria, and hence also the global fuel production rate, are limited only by thermodynamic considerations for any reasonable set of operating conditions. Thus, in terms of materials design, significant room exists for sacrificing material kinetics in favor of thermodynamic characteristics.

Additional Information

© 2016 Wiley-VCH. Received: December 4, 2015. Version of Record online: 23 FEB 2016. This work was supported by the Advanced Research Projects Agency - Energy (award no. DE-AR0000182) of the U.S. Department of Energy and by the U.S. National Science Foundation (award no. CBET-1038307). Support for T.C.D. was provided by an EERE Postdoctoral Research Award. We gratefully acknowledge Prof. Jane H. Davidson for fruitful discussions and Stephen Wilke for assistance with equipment assembly.

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