Regulating thermochemical redox temperature via oxygen defect engineering for protection of solar molten salt receivers

An active coating based on thermochemical redox reactions is proposed to protectmolten salt receivers fromsolar flux fluctuation. However, appropriatemetal oxidesworking in the temperature range of 530 and 850 degrees C are stillmissing. Herein, we put forward an oxygen defect engineering strategy to regulate the thermochemical redox temperatures of perovskites. A tunable temperature range of 426-702 degrees C is obtained by BaCo1-xMnxO3-delta (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-delta is 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 degrees C min(-1) to 3 degrees C min(-1) in the first 2 min under strong solar radiation, effectively relieving the thermal shock of the receiver.

Automated summary

A strategy of oxygen defect engineering is proposed to regulate the thermochemical redox temperatures of perovskites, resulting in an active coating with a tunable temperature range. The designed coating can effectively relieve the thermal shock of the receiver by slowing down the temperature rising rate under strong solar radiation.