As
an effective way to obtain freshwater resources, atmospheric
water harvesting (AWH) technology has been a wide concern of researchers.
Therefore, hydrogels gradually become key materials for atmospheric
water harvesters due to their high specific surface area and three-dimensional
porous structure. Here, we construct a core–shell hydrogel-based
atmospheric water harvesting material consisting of a shell sodium
polyacrylate (PAAS) hydrogel with an open pore structure and a core
thermosensitive poly N-isopropylacrylamide (PNIPAAm)
hydrogel with a large pore size. Theoretically, the mutual synergistic
hygroscopic effect between the core layer and the shell layer accelerates
the capture, transport, and storage of moisture to achieve continuous
and high-capacity moisture adsorption. Simultaneously, the integration
of polydopamine (PDA) with the hydrogel realizes solar-driven photothermal
evaporation. Therefore, the prepared core–shell hydrogel material
possesses great advantages in water adsorption capacity and water
desorption capacity with an adsorption of 2.76 g g–1 (90% RH) and a desorption of 1.42 kg m–2 h–1. Additionally, the core–shell structure hydrogel
collects 1.31 g g–1 day–1 of fresh
water in outdoor experiments, which verifies that this core–shell
hydrogel with integrated photothermal properties can capture moisture
in a wide range of humidity without any external energy consumption,
can further sustainably obtain fresh water in remote water-shortage
areas.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.