Regulating thermochemical redox temperature via oxygen defect engineering for protection of solar molten salt receivers
Peng Yuan,
Changdong Gu,
Haoran Xu,
Zeyu Ning,
Kefa Cen,
Gang Xiao
Affiliations
Peng Yuan
State Key Laboratory of Clean Energy Utilization, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; Qingshanhu Energy Research Center, Zhejiang University, Linan, Hangzhou, Zhejiang 310027, China
Changdong Gu
State Key Laboratory of Silicon Materials, College of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China
Haoran Xu
State Key Laboratory of Clean Energy Utilization, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; Qingshanhu Energy Research Center, Zhejiang University, Linan, Hangzhou, Zhejiang 310027, China
Zeyu Ning
State Key Laboratory of Clean Energy Utilization, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; Qingshanhu Energy Research Center, Zhejiang University, Linan, Hangzhou, Zhejiang 310027, China
Kefa Cen
State Key Laboratory of Clean Energy Utilization, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; Qingshanhu Energy Research Center, Zhejiang University, Linan, Hangzhou, Zhejiang 310027, China
Gang Xiao
State Key Laboratory of Clean Energy Utilization, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; Qingshanhu Energy Research Center, Zhejiang University, Linan, Hangzhou, Zhejiang 310027, China; Corresponding author
Summary: An 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−δ 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°C min−1 to 3°C min−1 in the first 2 min under strong solar radiation, effectively relieving the thermal shock of the receiver.
