The nonstoichiometric cerium oxide (ceria) redox cycle is an attractive pathway for storing energy from concentrated sunlight in chemical bonds by splitting water and carbon dioxide. The endothermic reduction reaction
CeO2-δoxCeO2-δed+Δδ2O2
(R1)
is favored thermodynamically at high temperatures and low oxygen partial pressures, while the CO2 and H2O splitting reactions (R2, R3) are exothermic and favored at lower temperatures and higher oxygen partial pressures. The produced hydrogen and carbon monoxide, referred to collectively as syngas, are important feedstocks used in the synthesis of ammonia and liquid fuels.
CeO2-δed+ΔδCO2CeO2-δox+ΔδCO
(R2)
 
CeO2-δed+ΔδH2OCeO2-δox+ΔδH2
(R3)
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