材料科学
碳纳米管
汽化
石墨烯
化学工程
蒸发
光热治疗
太阳能
水蒸气
碳纤维
纳米技术
化学
复合材料
热力学
有机化学
复合数
工程类
物理
生物
生态学
作者
Qiao Hou,Chaorui Xue,Ning Li,Huiqi Wang,Qing Chang,Hantao Liu,Jinlong Yang,Shengliang Hu
出处
期刊:Carbon
[Elsevier]
日期:2019-08-01
卷期号:149: 556-563
被引量:111
标识
DOI:10.1016/j.carbon.2019.04.083
摘要
Solar-driven water vaporization is considered one of the most sustainable technologies to solve water scarcity. However, the advanced design solar absorber system is still required for highly efficient steam generation. Here we develop a novel system for water evaporation through assembly of carbon dots within microchannels of processed wood. Not only is a dual-layer structure including of heat barrier and water transport channel formed, but also the modulation of carbon dot energy structures in favor of photothermal conversion is realized synchronously. This system exhibits higher water evaporation rate and energy efficiency for solar to steam generation than other black photothermal sheets (e.g. carbon nanotube, graphene, graphene oxide). On the one hand, the constructed size-dependent vaporization enthalpy theory shows that the micropores are beneficial to reduce vaporization enthalpy of water. On the other hand, the presented direct evidences for the roles of oxidation functional groups in solar thermal evaporation demonstrate that hydroxyl groups can improve solar-to-heat efficiency. Therefore, tailoring pore sizes and surface functional groups could be an efficient method for solar-to-vapor systems.
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