Heterostructured perylene diimide (PDI) supramolecular nanorods with SnO2 quantum dots for enhanced visible-light photocatalytic activity and stability
Heterostructured perylene diimide (PDI) supramolecular nanorods with SnO2 quantum dots for enhanced visible-light photocatalytic activity and stability
复制标题
具有 SnO2 量子点的异质结构苝二酰亚胺 (PDI) 超分子纳米棒可增强可见光光催化活性和稳定性
DOI：
10.1002/cctc.202200087
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发表时间：
--
期刊：
影响因子：
4.5
通讯作者：
Luo Xin
中科院分区：
文献类型：
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作者：
Liu Di;Li Yi;Zhang Xinling;Yang Li;Luo Xin
通过简单的原位复合方法成功构建了一种新型SnO 2 QDs/PDI异质结光催化剂，并在可见光照射下表现出高度增强的光催化性能和长期稳定性。ISI-XPS和AFM-KPFM的结果表明，有效的光生电子从PDI超分子纳米棒转移到紧密附着在SnO 2量子点上，这是由跨该异质界面的巨大内建电场驱动的，从而大大提高了光生载流子的迁移和分离。重要的是，我们首次证明了异质结的形成可以有效地阻碍PDI阴离子自由基（PDI. -）的产生，从而通过减少PDI. -单元之间的静电排斥相互作用引起的PDI超分子的解离，实现了PDI超分子聚集体的光催化稳定性的改善。此外，所建立的高结构和形态稳定性也支持其优异的光催化稳定性。
A novel SnO2QDs (quantum dots)/PDI heterojunction photocatalyst was successfully constructed by a simple in‐situ compounded method and exhibited highly enhanced photocatalytic performance and long‐term stability under visible light irradiation. The results of ISI‐XPS and AFM‐KPFM revealed that the effective photo‐generated electrons transferred from PDI supramolecular nanorods to closely attached to SnO2QDs, which was driven by a giant built‐in electric field across this hetero‐interface, thus highly improved the migration and separation of photo‐generated carriers. Importantly, we have proved for the first time that the formation of heterojunction can effectively hinder the generation of PDI anion radicals (PDI.−), thereby realized improved photocatalytic stability of PDI supramolecular aggregates by reducing the dissociation of PDI supramolecular caused by electrostatic repulsion interaction between PDI.−units. Furthermore, the established high structure and morphology stability also supported its excellent photocatalytic stability.