Thermal Efficiency of Solar Steam Generation Approaching 100 % through Capillary Water Transport

作者：Hanxue Liang, Qihua Liao, Nan Chen, Yuan Liang, Guiqin Lv, Panpan Zhang, Bing Lu, Liangti Qu · 发表于：Angewandte Chemie International Edition · 年份：2019 · DOI：10.1002/anie.201911457 · 被引用次数：315 · 研究领域：Solar-Powered Water Purification Methods、Surface Modification and Superhydrophobicity、Membrane Separation Technologies

Abstract Solar‐driven interfacial water evaporation yield is severely limited by the low efficiency of solar thermal energy. Herein, the injection control technique (ICT) achieves a capillary water state in rGO foam and effectively adjusts the water motion mode therein. Forming an appropriate amount of capillary water in the 3D graphene foam can greatly increase the vapor escape channel, by ensuring that the micrometer‐sized pore channels do not become completely blocked by water and by exposing as much evaporation area as possible while preventing solar heat from being used to heat excess water. The rate of solar steam generation can reach up to 2.40 kg m −2 h −1 under solar illumination of 1 kW m −2 , among the best values reported. In addition, solar thermal efficiency approaching 100 % is achieved. This work enhances solar water‐evaporation performance and promotes the application of solar‐driven evaporation systems made of carbon‐based materials.