Multifunctional daytime radiative cooler resistant to UV aging

IF 6.3 2区 材料科学 Q2 ENERGY & FUELS
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Abstract

Passive radiative cooling presents a promising approach to mitigate global warming and reduce energy consumption. Existing coolers, however, face challenges in practical prolonged adoption due to their unappealing design, susceptibility to environmental pollutants, as well as degradation of polymers by ultraviolet (UV) irradiation from sunlight. This study introduces a multifunctional daytime radiative cooler (MDRC) with a dual-layered structure, combining practical functionality with aesthetic value. Its base layer consists of an Ag–TiO2–Ag thin film stack, imparting vibrant cyan, magenta, and yellow colors, even maintaining visually appealing from various incident angles, up to 75°, to ensure consistent color display. The top layer, comprising S–SiO2 nanospheres with UV resistance rather than polymers, not only forms a superhydrophobic surface with a contact angle of 155.502°, enhancing the self-cleaning capability of the MDRC against contamination and dust, but also renders the MDRC with extraordinary anti-aging capacity. Outdoor experiments has shown that the MDRC maintains operation at temperatures above ambient under direct solar irradiation, achieving a substantial temperature reduction of 6.82 °C compared to the same colored commercial coating. After three months of outdoor exposure, the MDRC demonstrated minimal degradation in performance, with decreases of only 0.29 °C during the day and 0.12 °C at night, underscoring its superior UV-resistant aging properties. This MDRC represents a robust solution for diverse durable outdoor raidative cooling applications, advancing toward real-world utilization.

多功能日间辐射冷却器,抗紫外线老化
被动辐射冷却是减缓全球变暖和减少能源消耗的一种可行方法。然而,现有的冷却器由于设计不美观、易受环境污染物的影响以及阳光紫外线(UV)照射导致聚合物降解等原因,在实际长期应用中面临挑战。本研究介绍了一种具有双层结构的多功能日间辐射冷却器(MDRC),它兼具实用功能和美学价值。其底层由 Ag-TiO2-Ag 薄膜堆叠组成,可呈现鲜艳的青色、品红色和黄色,甚至在各种入射角度(最大 75°)下都能保持视觉吸引力,以确保色彩显示的一致性。表层由具有抗紫外线性能的 S-SiO2 纳米球而非聚合物组成,不仅形成了接触角为 155.502°的超疏水表面,增强了 MDRC 的自洁能力,防止污染和灰尘进入,还使 MDRC 具有超强的抗老化能力。室外实验表明,在太阳直射下,MDRC 可在高于环境温度的条件下保持运行,与相同颜色的商用涂层相比,温度大幅降低了 6.82 °C。经过三个月的户外曝晒后,MDRC 的性能降幅极小,白天仅降低 0.29 °C,夜间仅降低 0.12 °C,凸显了其卓越的抗紫外线老化特性。这种 MDRC 代表了一种强大的解决方案,可用于各种耐用的室外突袭冷却应用,并正在向实际应用迈进。
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来源期刊
Solar Energy Materials and Solar Cells
Solar Energy Materials and Solar Cells 工程技术-材料科学:综合
CiteScore
12.60
自引率
11.60%
发文量
513
审稿时长
47 days
期刊介绍: Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.
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