Abstract
An active coating based on metal oxides through thermochemical redox reactions is proposed to protect molten salt receivers from solar flux fluctuation. However, appropriate metal oxides between 530 and 850 ℃ are still missing. Herein, we put forward an oxygen defect engineering strategy to regulate the thermochemical redox temperature of perovskites. A tunable temperature range of 426-702 ℃ is obtained by BaCo1-xMnxO3-δ (x = 0-0.4) . It is found that a raised redox temperature can be obtained with the increase of the oxygen vacancy formation energy. For application, BaCo0.7Mn0.2O3-δ is designed as the active protective coating of a lab-scale receiver. The smart coating can decrease the temperature rising rate from 8.5 ℃ min -1 to 3 ℃ min -1 in the first 2 minutes at strong solar radiation , effectively relieving the thermal shock of the receiver.
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