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Harnessing overlapped temperature-salinity gradient in solar-driven interfacial seawater evaporation for efficient steam and electricity generation

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Journal of Energy Chemistry 2024年第8期95卷 694-700页

作者： Peida Li Dongtong He Jingchang Sun Jieshan Qiu Zhiyu Wang State Key Lab of Fine Chemicals Liaoning Key Lab for Energy Materials and Chemical Engineering Dalian University of Technology School of Physics and Electronic Technology Liaoning Normal University College of Chemical Engineering Beijing University of Chemical Technology

Solar-driven interfacial water evaporation（SIWE） offers a superb way to leverage concentrated solar heat to minimize energy dissipation during seawater desalination. It also engenders overlapped temperaturesalinity gradient（TSG） between water-air interface and adjacent seawater, affording opportunities of harnessing electricity. However, the efficiency of conventional SIWE technologies is limited by significant challenges, including salt passivation to hinder evaporation and difficulties in exploiting overlapped TSG simultaneously. Herein, we report self-sustaining hybrid SIWE for not only sustainable seawater desalination but also efficient electricity generation from TSG. It enables spontaneous circulation of salt flux upon seawater evaporation, inducing a self-cleaning evaporative interface without salt passivation for stable steam generation. Meanwhile, this design enables spatial separation and simultaneous utilization of overlapped TSG to enhance electricity generation. These benefits render a remarkable efficiency of90.8% in solar energy utilization, manifesting in co-generation of solar steam at a fast rate of 2.01 kg m-2-h-1and electricity power of 1.91 W m-2with high voltage. Directly interfacing the hybrid SIWE with seawater electrolyzer constructs a system for water-electricity-hydrogen co-generation without external electricity supply. It produces hydrogen at a rapid rate of 1.29 L h-1m-2and freshwater with 22 times lower Na+concentration than the World Health Organization（WHO） threshold.

关键词： Electricity generation Seawater Solar-driven interfacial water evaporation steam generation

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Bifunctional plasmonic colloidosome/graphene oxidebased floating membranes for recyclable high-efficiency solar-driven clean water generation

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Nano Research 2018年第7期11卷 3854-3863页

作者： Minmin Wang Jie Zhang Ping Wang Chuanping Li Xiaolong Xu Yongdong Jin State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China University of Chinese Academy of Sciences Beijing 100049 China

Utilizing plasmonic nano-particles/structures for solar water evaporation has aroused increasing interest; however, large-scale methods are desired to boost the efficiency and improve the practicality of solar steam generation. We developed a membrane-supported floating solar steam generation system based on graphene oxide and a multiscale plasmonic nanostructure; the latter is a micrometer-sized colloidosome that was assembled from hollow and porous Ag/Au nanocubes. By taking advantage of multiscale plasmonic coupling of the particles, an extremely high solar thermal conversion efficiency up to 92% at 10 kW·m^-2 （with a water evaporation rate reaching 12.96 kg·m^-2·h^-1） can be achieved. The TiO2 nanoparticle-modified floating system is also capable of high-efficiency dye degradation in organic-polluted water, rendering such a membrane system recyclable and scalable for practical and versatile solar-driven generation of clean water.

关键词： plasmonic photothermal recyclable steam generation dye degradation

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