writer：Lingmei Zhu # , Jinghui Li # , Leishuang Zhong, Lei Zhang, Maolin Zhou, Huan Chen, Yongping Hou, Yon
keywords：Water collection
source：期刊
Issue time：2022年

Facing the global aggravation of freshwater resource scarcity situation, it is absolutely critical to develop a high efficiency, low cost, scalable and environmental technology for increasing demand of freshwater. Herein, we present an excellent dual-photothermal freshwater collector (DPFC) that combines the properties of graphene oxide (rGO) and silver nanoparticles (Ag NPs) to form three-dimensional porous materials in a polyvinyl alcohol (PVA) gel network, where rGO/Ag plays the key role in dual-photothermal conversion. The introduction of Ag

NPs into GO sheets not only restricts GO stacking but also improves the stability and dispersity of Ag NPs in rGO sheets. As a solar steam generator, the DPFC possesses great hydrophilicity, light weight, which are favorable to realize efficient energy utilization and heat localization for water collector. With high absorbance of rGO/Ag, the DPFC exhibits a high solar energy conversion efficiency of 95.67% and an evaporation rate of 3.20 kg m ?2 h ?1 under one sun (1 kW m ?2 ), thus the freshwater can be generated effectively. Especially, DPFC generates freshwater to be 6.25–9.38 L m ?3 h ?1 under outside sunlight. As for 20% salt aqueous solution, DPFC completely inhibits the salt precipitation under one sun to get freshwater. Such a dual-photothermal freshwater collector provides an insight to design of novel materials for a wide range of applications, e.g., freshwater collection.