Ultrahigh solar-driven atmospheric water production enabled by scalable rapid-cycling water harvester with vertically aligned nanocomposite sorbent

Xu, Jiaxing; Li, Tingxian; Yan, Tao; Wu, Si; Wu, Minqiang; Chao, Jingwei; Huo, Xiangyan; Wang, Pengfei; Wang, Ruzhu

doi:10.1039/d1ee01723c

Cited by 240 publications

(163 citation statements)

References 66 publications

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“…The desorption of LiCl@HGAFs was carried out under a typical water vapor pressure of 1.2 kPa. Considering that the desorption temperature of LiCl@HGAFs depends on the dehydration of LiCl·H 2 O, the theoretical desorption temperature to the product of LiCl is 69 °C according to Clausius–Clapeyron equilibrium equation 24 . Therefore, under the photo-thermal condition (47 °C), LiCl@HGAFs undergo the desorption from LiCl solution to LiCl·H 2 O, where the regeneration degree can reach 83.4% (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

et al. 2022

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Aerogel fibers have been recognized as the rising star in the fields of thermal insulation and wearable textiles. Yet, the lack of functionalization in aerogel fibers limits their applications. Herein, we report hygroscopic holey graphene aerogel fibers (LiCl@HGAFs) with integrated functionalities of highly efficient moisture capture, heat allocation, and microwave absorption. LiCl@HGAFs realize the water sorption capacity over 4.15 g g−1, due to the high surface area and high water uptake kinetics. Moreover, the sorbent can be regenerated through both photo-thermal and electro-thermal approaches. Along with the water sorption and desorption, LiCl@HGAFs experience an efficient heat transfer process, with a heat storage capacity of 6.93 kJ g−1. The coefficient of performance in the heating and cooling mode can reach 1.72 and 0.70, respectively. Notably, with the entrapped water, LiCl@HGAFs exhibit broad microwave absorption with a bandwidth of 9.69 GHz, good impedance matching, and a high attenuation constant of 585. In light of these findings, the multifunctional LiCl@HGAFs open an avenue for applications in water harvest, heat allocation, and microwave absorption. This strategy also suggests the possibility to functionalize aerogel fibers towards even broader applications.

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Section: Resultsmentioning

confidence: 99%

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

et al. 2022

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“…It is because hygroscopic salts are still able to absorb water from the air as long as the RH requirement is satisfied, despite the environmental temperature and the air vapor density. [ 43 ] The temperature effect is magnified when the RH changes with temperature by adjusting the water gradient (Figure S27, Supporting Information). For example, at an air vapor density of 10 g kg –1 , increasing the temperature from 16 to 33 °C would decrease the local RH from 90% to 30%, which might easily give rise to water desorption of the AHS.…”

Section: Resultsmentioning

confidence: 99%

An Asymmetric Hygroscopic Structure for Moisture‐Driven Hygro‐Ionic Electricity Generation and Storage

Zhang

Guo

et al. 2022

Advanced Materials

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The interactions between moisture and materials give rise to the possibility of moisture‐driven energy generation (MEG). Current MEG materials and devices only establish this interaction during water sorption in specific configurations, and conversion is eventually ceased by saturated water uptake. This paper reports an asymmetric hygroscopic structure (AHS) that simultaneously achieves energy harvesting and storage from moisture absorption. The AHS is constructed by the asymmetric deposition of a hygroscopic ionic hydrogel over a layer of functionalized carbon. Water absorbed from the air creates wet‐dry asymmetry across the AHS and hence an in‐plane electric field. The asymmetry can be perpetually maintained even after saturated water absorption. The absorbed water triggers the spontaneous development of an electrical double layer (EDL) over the carbon surface, which is termed a hygro‐ionic process, accounting for the capacitive properties of the AHS. A peak power density of 70 µW cm‐3 was realized after geometry optimization. The AHS shows the ability to be recharged either by itself owing to a self‐regeneration effect or via external electrical means, which allows it to serve as an energy storage device. In addition to insights into moisture‐material interaction, AHSs further shows potential for electronics powering in assembled devices.

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“…But more importantly, a porous waterproof and moisture permeable membrane encapsulation method is developed and can be applied to any salt-based sorbents to prevent the risk of solution leakage. For example, other matrixes for salt-based sorbents, such as PAM-CNT ( Li et al., 2018 ) and rGO-SA ( Xu et al., 2021 ), other hygroscopic salts, such as LiCl and CaCl 2 , even different waterproof and moisture permeable membranes, such as PVDF membrane or omniphobic fabric ( Li et al., 2021 ), can be used for synthesizing membrane encapsulated salt-based sorbents according to this protocols. Here lithium chloride (LiCl), as a kind of salt with the highest AWH capacity, was selected as an example, which produces the maximum amount of salt solution and the largest volume expansion during the sorption process.…”

Section: Before You Beginmentioning

confidence: 99%

Ultrahigh solar-driven atmospheric water production enabled by scalable rapid-cycling water harvester with vertically aligned nanocomposite sorbent

Abstract: Fresh water scarcity is a globally significant challenge threatening the development of human society. Sorption-based atmospheric water harvesting offers an appealing way to solve this challenge by extracting clean water...

Cited by 240 publications

References 66 publications

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

An Asymmetric Hygroscopic Structure for Moisture‐Driven Hygro‐Ionic Electricity Generation and Storage

An encapsulation protocol of salt-based composite sorbents for atmospheric water harvesting

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