Wang Linfeng, Liu Changjun, Wang Han, Xu Yuan, Ma Sitian, Zhuang Yan, Xu Weilin, Cui Weigang, Yang Hongjun
ACS Appl Mater Interfaces. 2020 May 27;12(21):24328-24338. doi: 10.1021/acsami.0c04740. Epub 2020 May 15.
A three-dimensional solar steam generation device with a high water evaporation rate and excellent structural stability was developed and characterized. The design consisted of a bilayer membrane composed of polyacrylonitrile (PAN) and PAN/graphene oxide (GO) segments and contained vertically aligned porous structures similar to that of wood. This distinctive design was used to improve the water evaporation rate by increasing the light absorption and specific surface area. The prepared bilayer membrane exhibited excellent water wicking and flux, and it could continuously supply water from the bottom of the solar steam generation device to the top surface. The device's performance was evaluated by exposing the PAN/GO surface to artificial sunlight with a density of 1, 5, and 10 kW m. The water evaporation rate and steam generation efficiency for the PAN and PAN/GO bilayer membrane were found to be 2.27 kg m h and 92.63% at a power density of 1 kW m, respectively. Owing to its facile fabrication, hierarchical pore structure, excellent mechanical and water wicking, and high efficiency, the special bilayer composite device has great potential for solar steam generation and desalination applications in resource-limited settings.
开发并表征了一种具有高水蒸发速率和优异结构稳定性的三维太阳能蒸汽发生装置。该设计由由聚丙烯腈（PAN）和PAN/氧化石墨烯（GO）段组成的双层膜构成，并包含类似于木材的垂直排列的多孔结构。这种独特的设计用于通过增加光吸收和比表面积来提高水蒸发速率。制备的双层膜表现出优异的水芯吸和通量，并且可以从太阳能蒸汽发生装置的底部连续地将水供应到顶表面。通过将PAN/GO表面暴露于密度为1、5和10 kW m的人工阳光下评估该装置的性能。发现在功率密度为1 kW m时，PAN和PAN/GO双层膜的水蒸发速率和蒸汽产生效率分别为2.27 kg m h和92.63％。由于其易于制造、分级孔结构、优异的机械性能和水芯吸以及高效率，这种特殊的双层复合装置在资源有限的环境中具有用于太阳能蒸汽产生和海水淡化应用的巨大潜力。
