GO/PVA阵列结构吸收体高效光蒸汽转化

GO/PVA Array Structure Absorber for Efficient Solar Generation of Water Vapor

将氧化石墨烯(GO)均匀分散于聚乙烯醇(PVA)水溶液中,烘干制备出表面平整的GO/PVA膜。利用激光刻蚀工艺对GO/PVA膜的表面进行处理得到LT-GO/PVA膜,研究LT-GO/PVA膜的微观结构、物理性能及其作为光热转化器件的性能。结果表明:LT-GO/PVA膜表面形成了3D多孔阵列结构,可促进太阳光的吸收,减少漫反射造成的能量损耗;LT-GO/PVA膜表面开始从亲水性向疏水性转变,可促进水的快速蒸发与分离,在1 kW/m^(2)的光强度下,其光热水蒸发速率为1.827 kg/(m^(2)·h),光热转化效率为89.4%。

The graphene oxide(GO)was uniformly dispersed in a polyvinyl alcohol(PVA)aqueous solution,and dried to prepare a GO/PVA film with a smooth surface.The surface of GO/PVA film was treated by laser etching process to obtain LT-GO/PVA film,and the microstructure,physical properties of LT-GO/PVA film and its perfor‐mance as a solar-thermal conversion device were investigated.The results show that the surface of LT-GO/PVA film forms a 3D porous array structure,which can promote the absorption of sunlight and reduce the energy loss caused by diffuse reflection.The surface of LT-GO/PVA film starts to change from hydrophilic to hydrophobic,which can enhance the evaporation and separation of water from LT-GO/PVA film surface.Under the light intensity of 1 kW/m^(2),the evaporation rate of water is 1.827 kg/(m^(2)·h),and the light-to-heat conversion efficiency is 89.4%.