A visibly transparent radiative cooling film with self-cleaning function produced by solution processing

作     者：Guoliang Chen Yaming Wang Jun Qiu Jianyun Cao Yongchun Zou Shuqi Wang Jiahu Ouyang Dechang Jia Yu Zhou Guoliang Chen;Yaming Wang;Jun Qiu;Jianyun Cao;Yongchun Zou;Shuqi Wang;Jiahu Ouyang;Dechang Jia;Yu Zhou

作者机构：Institute for Advanced CeramicsHarbin Institute of TechnologyHarbin 150080China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing TechnologyHarbin Institute of TechnologyHarbin 150001China School of Energy Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Key Laboratory of Aerospace ThermophysicsMinistry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin 150001China Department of Materials and National Graphene InstituteUniversity of ManchesterManchesterM139PLU.K. 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第90卷第31期

页      面：76-84页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52071114 and 52001100) the Aviation Science Foundation of China(No.20163877014)。 

主　　题：Nanocomposite film Radiative cooling Visibly transparent Self-cleaning 

摘      要：Daylighting structures,including solar cells and building windows,utilize sunlight whilst suffering from undesired solar heat and outdoor dust contamination.A radiative cooling system that is transparent to sunlight and has a superhydrophobic surface would cool and clean the daylighting structures in a sustainable manner.However,the majority of the current daytime radiative cooling systems were designed to fully reflect the incident sunlight to maximize the cooling power.In this work,we optimized both the sunlight transmission and infrared thermal irradiation by modeling the size-dependent scattering and absorption of light by SiO_(2)spheres embedded in a polymer matrix,we found that the use of nanospheres(20 nm)enabled both high sunlight transmittance(90%)and infrared emissivity(-0.85).This theoretical prediction was confirmed by experimental measurements of a solution-processed nanocomposite film.When coated on a solar cell,the as-prepared film not only preserved the power conversion efficiency of the cell(14.71%,uncoated cell has an efficiency of 14.79%)but also radiatively cooled the cell by up to 5℃under direct sunlight.This reduction of the operating temperature of the solar cell further enhanced its electrical power output,evidenced by an increase in the equilibrium temperature of the LED load by about 14℃.The nanoscale textured surface formed by the nanospheres further led to superhydrophobicity and thus excellent self-cleaning performance(efficient removal of dust by wind and/or water droplets).