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A rechargeable molecular solar thermal system below 0 °C
Chemical Science ( IF 7.6 ) Pub Date : 2022-05-16 , DOI: 10.1039/d2sc01873j Zhichun Shangguan 1 , Wenjin Sun 1 , Zhao-Yang Zhang 1 , Dong Fang 1 , Zhihang Wang 2 , Si Wu 3 , Chao Deng 4 , Xianhui Huang 1 , Yixin He 1 , Ruzhu Wang 3 , Tingxian Li 3 , Kasper Moth-Poulsen 2, 5, 6 , Tao Li 1
Chemical Science ( IF 7.6 ) Pub Date : 2022-05-16 , DOI: 10.1039/d2sc01873j Zhichun Shangguan 1 , Wenjin Sun 1 , Zhao-Yang Zhang 1 , Dong Fang 1 , Zhihang Wang 2 , Si Wu 3 , Chao Deng 4 , Xianhui Huang 1 , Yixin He 1 , Ruzhu Wang 3 , Tingxian Li 3 , Kasper Moth-Poulsen 2, 5, 6 , Tao Li 1
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An optimal temperature is crucial for a broad range of applications, from chemical transformations, electronics, and human comfort, to energy production and our whole planet. Photochemical molecular thermal energy storage systems coupled with phase change behavior (MOST-PCMs) offer unique opportunities to capture energy and regulate temperature. Here, we demonstrate how a series of visible-light-responsive azopyrazoles couple MOST and PCMs to provide energy capture and release below 0 °C. The system is charged by blue light at −1 °C, and discharges energy in the form of heat under green light irradiation. High energy density (0.25 MJ kg−1) is realized through co-harvesting visible-light energy and thermal energy from the environment through phase transitions. Coatings on glass with photo-controlled transparency are prepared as a demonstration of thermal regulation. The temperature difference between the coatings and the ice cold surroundings is up to 22.7 °C during the discharging process. This study illustrates molecular design principles that pave the way for MOST-PCMs that can store natural sunlight energy and ambient heat over a wide temperature range.
更新日期：2022-05-16
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