Constructing central hollow cylindrical reduced graphene oxide foams with vertically and radially orientated porous channels for highly efficient solar-driven water evaporation and purification  

作　　者：Changjun Li Wei Li Hao-Yu Zhao Xin-Yue Feng Xiaofeng Li Zhong-Zhen Yu 

机构地区：[1]State Key Laboratory of Organic-Inorganic Composites,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China [2]Beijing Key Laboratory of Advanced Functional Polymer Composites,Beijing University of Chemical Technology,Beijing 100029,China [3]College of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China

出　　处：《Nano Research》2023年第5期6343-6352,共10页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.U1905217,52090034,and 51773008);the Fundamental Research Funds for the Central Universities(No.XK1802)is gratefully acknowledged.

摘　　要：Although solar steam generation is an eco-friendly approach for desalinating seawater and purifying wastewater,there are still issues on how to improve the efficiency of solar energy utilization and accelerate the water and heat transport inside the solardriven water evaporators.Herein,we design a central hollow cylindrical reduced graphene oxide(RGO)foam with vertically and radially orientated channels as a solar steam generation device for efficient water evaporation and purification.The vertically aligned porous channels accelerate upward transport of water to the top evaporation surface,while the radially aligned porous channels facilitate water transport and heat transfer along the radial directions for fully utilizing the heat accumulated inside the central cylindrical hole of the foam.The central hole of the foam plays a highly positive role in accumulating more heat for accelerating the water evaporation,the newly generated inner sidewall resulted from the central hole can gain extra thermal energy from surrounding environment in the same way as the outer sidewall of the foam due to the surface cooling effect of the water evaporation.As a result,the vertically and radially aligned RGO foam evaporator with central hollow cylinder achieves a high solar steam generation rate of 2.32 kg·m^(−2)·h^(−1)with an exceptional energy conversion efficiency of 120.9%under 1-sun irradiation,superior to the vertically aligned RGO foam without the central hole(1.83 kg·m^(−2)·h^(−1),96.9%)because of the enhanced water and heat transfer inside the porous channels,the efficient utilization of environmental energy.

关 键 词：hollow cylindrical foams reduced graphene oxide solar steam generation water evaporation rate seawater desalination 

分 类 号：TQ127.11[化学工程—无机化工] TK519[动力工程及工程热物理—热能工程]