Biradical-Featured Stable Organic-Small-Molecule Photothermal Materials for Highly Efficient Solar-Driven Water Evaporation
Biradical-Featured Stable Organic-Small-Molecule Photothermal Materials for Highly Efficient Solar-Driven Water Evaporation
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用于高效太阳能驱动水蒸发的双自由基稳定有机小分子光热材料
DOI：
10.1002/adma.201908537
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发表时间：
2020-06-09
影响因子：
29.4
通讯作者：
Tang, Ben Zhong
中科院分区：
文献类型：
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作者：
Chen, Guanyu;Sun, Jiangman;Tang, Ben Zhong
随着光热材料的发展，有机小分子具有柔性、结构多样、性质可调等特点，显示出独特的优势，但由于其对太阳光的吸收有限，导致光热转换效率低，在太阳能驱动的水蒸发中应用较少。在这里，一种稳定的藏红花衍生物，命名为CR-TPE-T，被设计成在固体状态下表现出独特的双自由基性质和强大的pi-pi堆积，这不仅有利于从300到1600 nm的宽吸收光谱有效地收集阳光，而且通过促进非辐射衰变而促进高效的光热转换。在808 nm激光照射下，其光热效率为72.7%。在此基础上，成功建立了基于CR-TPE-T的界面加热蒸发系统，在1个太阳辐射下获得了高达87.2%的光能转化效率和1.272 kg m(-2)h(-1)的水蒸气蒸发速率，为有机小分子光热材料在太阳能利用中的应用迈出了重要的一步。
With recent progress in photothermal materials, organic small molecules featured with flexibility, diverse structures, and tunable properties exhibit unique advantages but have been rarely applied in solar-driven water evaporation owing to limited sunlight absorption resulting in low solar-thermal conversion. Herein, a stable croconium derivative, named CR-TPE-T, is designed to exhibit the unique biradical property and strong pi-pi stacking in the solid state, which facilitate not only a broad absorption spectrum from 300 to 1600 nm for effective sunlight harvesting, but also highly efficient photothermal conversion by boosting nonradiative decay. The photothermal efficiency is evaluated to be 72.7% under 808 nm laser irradiation. Based on this, an interfacial-heating evaporation system based on CR-TPE-T is established successfully, using which a high solar-energy-to-vapor efficiency of 87.2% and water evaporation rate of 1.272 kg m(-2) h(-1) under 1 sun irradiation are obtained, thus making an important step toward the application of organic-small-molecule photothermal materials in solar energy utilization.