Fast oxygen ion migration in Cu-In-oxide bulk and its utilization for effective CO₂ conversion at lower temperature

Efficient activation of CO₂ at low temperature was achieved by reverse water-gas shift via chemical looping (RWGS-CL) by virtue of fast oxygen ion migration in a Cu-In structured oxide, even at lower temperatures. Results show that a novel Cu-In₂O₃ structured oxide can show a remarkably higher CO₂ splitting rate than ever reported. Various analyses revealed that RWGS-CL on Cu-In₂O₃ is derived from redox between Cu-In₂O₃ and Cu-In alloy. Key factors for high CO₂ splitting rate were fast migration of oxide ions in the alloy and the preferential oxidation of the interface of alloy-In₂O₃ in the bulk of the particles. The findings reported herein can open up new avenues to achieve effective CO₂ conversion at lower temperatures.