期刊
NANO-MICRO LETTERS
卷 14, 期 1, 页码 -出版社
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-021-00748-7
关键词
3D honeycomb fabric; MXene; Photothermal conversion; Water desalination; Salt harvesting
资金
- National Natural Science Foundation of China [52003131]
- Natural Science Foundation of Shandong Province [ZR2019BEM026]
- China Postdoctoral Science Foundation [2020M671997, 2021T140352]
- Youth Innovation Science and Technology Plan of Shandong Province [2020KJA013]
This research presents a solar evaporator with enhanced light absorption, minimal thermal loss, and efficient salt harvesting. The evaporator demonstrates high solar efficiency and evaporation rate, and enables complete separation of water/solute and efficient salt harvesting even under high salinity conditions.
Solar steam generation technology has emerged as a promising approach for seawater desalination, wastewater purification, etc. However, simultaneously achieving superior light absorption, thermal management, and salt harvesting in an evaporator remains challenging. Here, inspired by nature, a 3D honeycomb-like fabric decorated with hydrophilic Ti3C2Tx (MXene) is innovatively designed and successfully woven as solar evaporator. The honeycomb structure with periodically concave arrays creates the maximum level of light-trapping by multiple scattering and omnidirectional light absorption, synergistically cooperating with light absorbance of MXene. The minimum thermal loss is available by constructing the localized photothermal generation, contributed by a thermal-insulating barrier connected with 1D water path, and the concave structure of efficiently recycling convective and radiative heat loss. The evaporator demonstrates high solar efficiency of up to 93.5% and evaporation rate of 1.62 kg m(-2) h(-1) under one sun irradiation. Moreover, assisted by a 1D water path in the center, the salt solution transporting in the evaporator generates a radial concentration gradient from the center to the edge so that the salt is crystallized at the edge even in 21% brine, enabling the complete separation of water/solute and efficient salt harvesting. This research provides a large-scale manufacturing route of high-performance solar steam generator.
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