期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 185, 期 -, 页码 536-541出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2018.06.012
关键词
Radiative cooling; Reflectivity; Emissivity; Energy saving; Phosphite
资金
- Yangfan Innovative and Entrepreneurial Research Team Project [201312C07]
- Projects of Science and Technology Plan in Guangdong Province [2013A090100010]
- special fund projects of Applied Science and Technology in Guangdong Province [2015B020238006]
- National Natual Science Foundation of China [51372090]
Structures or materials with both high reflectivity in ultraviolet-visible-near infrared region (UV-Vis-NIR) and high emissivity in middle infrared region (MIR) can achieve radiative cooling. In this paper, a new crystal Mg-11(HPO3)(8)(OH)(6) was synthesized by hydrothermal method. Measurement results show that this crystal presents a reflectivity of 88.04% in 0.2-2.5 mu m region and an emissivity of 87.57% in 2.5-25 mu m region, suggesting that this material could reflect most of the solar light radiation, and in addition dissipate heat to the surroundings and outer space. The cell parameters and structure simulation diagram were obtained from the result of the Rietveld refinement. The properties and mechanisms were discussed based on X-ray diffraction, FTIR spectroscopy and electron microscopy results. The cooling test under strong sunshine showed that the temperatures in space below Mg-32(HPO3)(8)(OH)(6) coating were 2-4 degrees C lower than those below the coatings based on commercial solar heat reflection materials as TiO2 and CaCO3, and 6-8 degrees C lower than that below Al-foil, suggesting the potential application of the new crystal in radiative cooling.
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