期刊
SMALL
卷 17, 期 44, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202102689
关键词
ammonia; metal-organic frameworks; stability; thermal energy storage
类别
资金
- National Natural Science Foundation of China for the Distinguished Young Scholars [51825602]
- National Key Research and Development Program of China [2020YFB1506300]
- Analytical & Testing Centre of Huazhong University of Science and Technology
This study assesses the feasibility of thermal energy storage using seven MOF-ammonia working pairs, finding that MIL-101(Cr) and ZIF-8(Zn) are potential candidates for thermal energy storage. Compared to the MIL-101(Cr)-water working pair, the MIL-101(Cr)-ammonia working pair shows higher sorption capacity and coefficient of performance, indicating a more efficient and stable thermal energy storage system.
Recently, the application of metal-organic frameworks (MOFs) in thermal energy storage has attracted increasing research interests. MOF-ammonia working pairs have been proposed for controlling/sensing the air quality, while no work has yet been reported on the immense potential of MOFs for thermal energy storage up till now. Herein, the feasibility of thermal energy storage using seven MOF-ammonia working pairs is experimentally assessed. From ammonia sorption stability and sorption thermodynamics results, it is found that MIL-101(Cr) exhibits both high ammonia sorption stability and the largest sorption capacity of approximate to 0.76 g g(-1). Compared with MIL-101(Cr)-water working pair, MIL-101(Cr)-ammonia working pair improves the sorption capacity by over three times with evaporation temperature lower than 8.4 degrees C. Due to stable ammonia sorption stability and negligible hysteresis, MIL-101(Cr) and ZIF-8(Zn) are tested at condensation/evaporation temperature of 30 degrees C/10 degrees C. The thermal energy storage density (reaching over 1200 kJ kg(-1)) and coefficient of performance of MIL-101(Cr)-based system are both higher than ZIF-8(Zn)-based one due to larger average isosteric enthalpy and cycle sorption capacity. This experimental work paves the way for developing the high efficient and stable thermal energy storage system with MOF-ammonia working pairs especially for critical conditions with low evaporation temperature and high condensation temperature.
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