Efficient Passive Cooling Over a Novel Bifunctional Polymer Bilayer Composite Simultaneously Possessing Radiative and Evaporative Cooling Properties

IF 24.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Advanced Energy Materials Pub Date : 2024-12-04 DOI:10.1002/aenm.202404122

Qingxi Xin, Benchi Ma, Jiaying Ru, Yu Zhou, Dengwei Jing

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引用次数: 0

Abstract

Passive cooling technologies being free from additional energy consumption, offer significant advantages in reducing carbon emissions and mitigating global warming. However, radiative cooling has a thermodynamic limit, and evaporative cooling requires additional components, which restricts their large-scale application, respectively. Herein, a radiative/evaporative bifunctional cooling bilayer is presented, featuring an upper layer composed of poly(vinylidene fluoride-cohexafluoropropene) [P(VdF-HFP)] integrated with a hygroscopic hydrogel lower layer [polyacrylamide (PAAm)/alginate-CaCl₂]. High solar reflectance (0.916) and long-wave infrared emittance (0.900) of the P(VdF-HFP) combined with hydrogel evaporation enable a notable 15.4 °C temperature drop under 706.3 W·m⁻² solar radiation. The bilayer is demonstrated to be effective under outdoor conditions for continuous three cloudy days, achieving an average temperature reduction ranging from 6.3 to 15.7 °C. Considering the low cost and simplicity of the preparation method, ease of large-scale fabrication, and good cooling performance, this bilayer structure provides a promising strategy for the application of passive cooling.

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来源期刊

Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

41.90

自引率

4.00%

发文量

889

审稿时长

1.4 months

期刊介绍： Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.