<br>基于 PDI 的有机小分子通过分子间/内相互作用调节，实现高效太阳能蒸汽产生,Small

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基于 PDI 的有机小分子通过分子间/内相互作用调节，实现高效太阳能蒸汽产生
Small ( IF 13.0 ) Pub Date : 2023-08-27 , DOI: 10.1002/smll.202305856
Changxiang Shao ₁ , Bingpeng Guo ₂ , Bing Lu ₃ , Jiahui Yu ₁ , Huijun Kong ₁ , Baolei Wang ₁ , Meichun Ding ₁ , Chenwei Li ₁

Affiliation

具有加工可行性、结构多样性和微调特性的有机小分子在太阳能蒸汽发电方面具有潜在的应用。然而，太阳能吸收窄、光热转换效率低和光漂白等常见缺陷导致可用材料有限且蒸发性能不理想。在此，苝二酰亚胺（PDI）衍生物被用作稳定的阳光吸收剂，用于太阳能蒸汽的产生。特别是， N , N'-双(3,4,5-三甲氧基苯基)−3,4,9,10-苝四甲二酰亚胺(PDI-DTMA)经过精心设计，具有基于平面刚性PDI的供体-受体-供体构型核。实验论证和理论计算表明，高效的光热转换是通过强分子间π-π堆积和分子内电荷转移实现的。 PDI-DTMA具有1.17 eV的窄带隙，具有扩大的吸收光谱和增强的非辐射跃迁能力。构建了结合 PDI-DTMA 和聚乙烯醇的 3D 混合水凝胶 (PPH)。在光热转换、热定位管理、水活化和PPH畅通水传输的协同作用下，一个太阳下的水蒸发率高达3.61-10.07 kg m ^-2 h ^-1 。水凝胶在海水淡化和污水处理方面也具有巨大潜力。总的来说，这项工作为光热有机小分子的设计提供了宝贵的见解，并展示了它们在太阳能水蒸发方面的潜力。

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PDI-Based Organic Small Molecule Regulated by Inter/Intramolecular Interactions for Efficient Solar Vapor Generation

Organic small molecules with processing feasibility, structural diversity, and fine-tuned properties have the potential applications in solar vapor generation. However, the common defects of narrow solar absorption, low photothermal conversion efficiency, and photobleaching result in limited materials available and unsatisfactory evaporation performance. Herein, the perylene diimide (PDI) derivatives are exploited as stable sunlight absorbers for solar vapor generation. Particularly, the N,N'-bis(3,4,5-trimethoxyphenyl)−3,4,9,10-perylenetetracarboxylic diimide (PDI-DTMA) is well-designed with donor–acceptor–donor configuration based on plane rigid PDI core. The efficient photothermal conversion is enabled through strong intermolecular π–π stacking and intramolecular charge transfer, as revealed by experimental demonstration and theoretical calculation. The PDI-DTMA with a narrow band gap of 1.17 eV exhibits expanded absorption spectrum and enhanced nonradiative transition capability. The 3D hybrid hydrogels (PPHs) combining PDI-DTMA and polyvinyl alcohol are constructed. With the synergistic effect of solar-to-heat conversion, thermal localization management, water activation, and unobstructed water transmission of PPHs, the high water evaporation rates can reach 3.61–10.07 kg m⁻² h⁻¹ under one sun. The hydrogels also possess great potential in seawater desalination and sewage treatment. Overall, this work provides valuable insights into the design of photothermal organic small molecules and demonstrates their potentials in solar water evaporation.

更新日期：2023-08-27

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