期刊
ADVANCED MATERIALS
卷 32, 期 29, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201908537
关键词
biradical character; croconium dyes; photothermal conversion; solar-driven water evaporation
类别
资金
- National Natural Science Foundation of China [21702016, 21905015, 21973099]
- Beijing National Laboratory for Molecular Sciences [BNLMS201813]
- Fundamental Research Funds for the Central Universities [ZY1922]
- Research Grant Council of Hong Kong [16305518, C6009-17G, A-HKUST605/16]
- Innovation and Technology Commission [ITC-CNERC14SC01]
- National Science Foundation of China [21788102]
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.
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