摘要：SummaryAn active coating based on thermochemical redox reactions is proposed to protect molten salt receivers from solar flux fluctuation. However, appropriate metal oxides working in the temperature range of 530 and 850°C are still missing. Herein, we put forward an oxygen defect engineering strategy to regulate the thermochemical redox temperatures of perovskites. A tunable temperature range of 426–702°C 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, BaCo0.8Mn0.2O3−δis designed as the active protective coating of a lab-scale receiver, which has a thermal capacity of 82.95 kJ kg−1. The smart coating can slow down the temperature rising rate from 8.5°C min−1to 3°C min−1in the first 2 min under strong solar radiation, effectively relieving the thermal shock of the receiver.Graphical abstractDisplay OmittedHighlights•A thermochemical protective coating for solar molten salt receivers is proposed•BaCo1−xMnxO3−δ(x = 0–0.4) materials show a good cyclability after 120 cycles•Thermochemical redox temperatures are regulated by oxygen defect engineering•BaCo0.8Mn0.2O3−δcoating effectively relieves the thermal shock of the receiverEnergy Resources, Energy systems, Mechanical engineering
