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有机光伏催化剂以扩展激发扩散为高性能太阳能进化

Yufan Zhu^1,2, Zhenzhen Zhang^1,3, Wenqin Si^1,3

¹Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

Journal of the American Chemical Society

|July 11, 2022

概括

研究人员开发了一种新的有机分子 (F1),可显著增强光催化的进化. 这种分子具有更长的激子扩散长度,从而提高了将阳光转化为燃料的效率.

科学领域:

材料科学
光催化
可再生能源

背景情况:

经典的有机光催化剂具有短的激子扩散长度 (5-10纳米),这限制了它们在光催化演变中的效率.
提高光发光量子产量 (PLQY) 和激子扩散长度对于提高有机光催化剂性能至关重要.

研究的目的:

设计和合成一种新的光伏分子 (F1),以克服有机光催化剂中短激子扩散长度的局限性.
增强设计分子的光发光量子产量 (PLQY) 和激子扩散长度 (L_D).
基于F1的单元有机纳米粒子 (SC-NP) 的光催化演化率 (HER) 的评估.

主要方法:

一个光伏分子 (F1) 的设计和合成,其核心构件中缺少电子单位.
测量光发光量 (PLQY) 和计算 F1 薄膜的刺激扩散长度 (L_D).
使用F1制造单元有机纳米粒子 (SC-NP).
在AM 1.5G阳光照明下测试光催化演化率 (HER).

主要成果:

合成的F1分子表现出9.3%的增强PLQY和一个大的整体光谱重叠 (3.32 × 10^16 nm^4 M^-1 cm^-1).
F1膜的平均激子扩散长度 (L_D) 达到20 nm,大约是对照分子 (Y6) 的两倍.
在模拟的阳光下,基于F1的SC-NP实现了152.60 mmol h^-1 g^-1的优化平均演变率 (HER).

结论:

新型光伏分子F1有效增强了激子扩散长度和PLQY,解决了有机光催化中的关键局限性.
基于F1的单元有机纳米粒子显示了光催化演变的高效率,显示了可再生能源应用的前景.
开发的F1分子代表了高效有机光催化剂的设计的重大进步.

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