(174a) Revisiting Efficiency Limits of Solar Thermochemical Fuel Production By Non-Stoichiometric Ceria-Based Redox Cycling
In the present study, we critically review thermodynamic analyses of previous pertinent studies. We focus on the thermodynamic description of the gasâsolid flow configuration in the reduction and oxidation reactors. We present a new description leading to meaningful predictions of sweep gas and oxidizer demand based on conservation of mass and the Gibbs criterion. Further, we report on a novel optimization approach developed to accurately predict the efficiency limit at a system level for ceria-based metal oxides. We calculate a solar-to-fuel water splitting efficiency close to 8% for a system making use of a ceria-based metal oxide, temperature swings, pressure swings realized by inert sweep gas, gasâgas heat exchangers, and state-of-the-art gas separation technologies.
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