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Biomimetic Hygroscopic Fibrous Membrane with Hierarchically Porous Structure for Rapid Atmospheric Water Harvesting

2023; Wiley; Volume: 33; Issue: 26 Linguagem: Inglês

10.1002/adfm.202214813

1616-3028

Meng Xia, Dong Cai, Jianbo Feng, Peng Zhao, Jiakai Li, Rongxin Lv, Guiqiu Li, Lulu Yan, Wei Huang, Yongpeng Li, Zhuyin Sui, Meng Li, Hui Wu, Yijun Shen, Juanxiu Xiao, Dong Wang, Qi Chen,

Surface Modification and Superhydrophobicity

Abstract Sorption‐based atmospheric water generation (SAWG) is a promising strategy to alleviate the drinkable water scarcity of arid regions. However, the high‐water production efficiency remains challenging due to the sluggish sorption/desorption kinetics. Herein, a composite sorbent@biomimetic fibrous membrane (PPy‐COF@Trilayer‐LiCl) is reported by mimicking nature's Murray networks, which exhibits outstanding water uptake performance of 0.77–2.56 g g −1 at a wide range of relative humidity of 30%–80% within 50 min and fast water release capacity of over 95% adsorbed water that can be released within 10 min under one sun irradiation. The superior sorption–desorption kinetics of PPy‐COF@Trilayer‐LiCl are enabled by the novel hierarchically porous structure, which is also the critical factor to lead a directional rapid water transport and vapor diffusion. Moreover, as a proof‐of‐concept demonstration, a wearable SAWG device is established, which can operate 10 sorption–desorption cycles per day in the outdoor condition and produce a high yield of clean water reaching up to 3.91 kg m −2 day −1 . This study demonstrates a novel strategy for developing advanced solar‐driven SAWG materials with efficient water sorption–desorption properties.