Tandem Atmospheric Water Harvesting and Passive Cooling Enabled by Hygroscopic Biopolymer-Based Aerogels

IF 18.5 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Functional Materials Pub Date : 2025-03-16 DOI:10.1002/adfm.202423063

Junxi Li, Chengjian Xu, Linfeng Chen, Xinhai Zhang, Meifang Zhu, Yanhua Cheng

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引用次数: 0

Abstract

Atmospheric water harvesting (AWH) provides a promising pathway to alleviate global water stress. However, in arid areas, how to solve the local drought problem while making full use of other local wasted energy and improving resource utilization efficiency is still a challenge. Here, salt-based biodegradable and photothermal aerogels with vertical channels are constructed to efficiently utilize waste heat from photovoltaic (PV) panels for tandem atmospheric water harvesting and passive cooling. Specially, the hydrogen bonding interactions and the ionic cross-linking of the aerogel porous skeleton together ensure the material's stability. This aerogel has a high-water adsorption capacity (1.4–5.7 g·g⁻¹ at 30–90% relative humidity (RH)), and solar-powered water production of up to 1.80 g·g⁻¹·day⁻¹. After integrating aerogels with PV panels, PV waste heat water collection and evaporation processes result in a fresh-water production of 0.033 kg·m⁻²·h⁻¹, and the PV panel power generation increases by 2.9%. This work demonstrates the great potential of AWH technique combined with passive cooling to fully utilize low-grade energy, promoting the development of advanced energy-water cogeneration.

Abstract Image

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大气集水（AWH）为缓解全球水资源压力提供了一条前景广阔的途径。然而，在干旱地区，如何在解决当地干旱问题的同时，充分利用当地其他浪费的能源，提高资源利用效率仍是一个挑战。在此，我们构建了具有垂直通道的盐基可降解光热气凝胶，以有效利用光伏板的余热，实现大气水收集和被动冷却。特别值得一提的是，气凝胶多孔骨架的氢键相互作用和离子交联共同确保了材料的稳定性。这种气凝胶具有很高的水吸附能力（30-90% 相对湿度（RH）条件下为 1.4-5.7 g-g-1），太阳能产水量可达 1.80 g-g-1-天-1。将气凝胶与光伏板整合后，光伏废热废水收集和蒸发过程产生的淡水量为 0.033 kg-m-2-h-1，光伏板发电量增加了 2.9%。这项工作表明，AWH 技术与被动冷却相结合，在充分利用低品位能源方面具有巨大潜力，可促进先进的能水联产技术的发展。

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来源期刊

Advanced Functional Materials 工程技术-材料科学：综合

CiteScore

29.50

自引率

4.20%

发文量

2086

审稿时长

2.1 months

期刊介绍： Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.