内建电场与偶极场协同增强SnNb2O6/富氮C3N5 S型异质结光催化性能

doi:10.3866/PKU.WHXB202311016

物理化学学报 >> 2024, Vol. 40 >> Issue (10): 2311016.doi: 10.3866/PKU.WHXB202311016

所属专题：太阳燃料光催化剂

内建电场与偶极场协同增强SnNb₂O₆/富氮C₃N₅ S型异质结光催化性能

刘倩倩¹^,†^,*(), 杜兴¹^,†, 李宛飞¹^,², 戴维林³^,*(), 刘波¹^,*()

¹ 苏州科技大学材料科学与工程学院, 苏州市微纳光电材料与传感器重点实验室, 江苏苏州 215009
² 姑苏实验室, 江苏苏州 215123
³ 复旦大学化学系, 上海市分子催化与创新材料重点实验室, 上海 200433

收稿日期:2023-11-10 修回日期:2023-12-15 录用日期:2023-12-18 发布日期:2024-03-13
通讯作者: Email: liuqianqian@usts.edu.cn. Tel.: +86-15995837516 (刘倩倩)wldai@fudan.edu.cn. Tel.: +86-512-68097107 (戴维林)liubo@mail.usts.edu.cn (戴维林)
作者简介:
^†These authors contributed equally to this paper.
基金资助:
国家自然科学基金项目(22002102); 国家自然科学基金项目(61904118); 国家自然科学基金项目(62205231); 江苏省研究生科研与实践创新项目(SJCX22_1555); 江苏省环境功能材料重点实验室

Synergistic Effects of Internal Electric and Dipole Fields in SnNb₂O₆/Nitrogen-Enriched C₃N₅ S-Scheme Heterojunction for Boosting Photocatalytic Performance

Qianqian Liu¹^,*(), Xing Du¹, Wanfei Li¹^,², Wei-Lin Dai³^,*(), Bo Liu¹^,*()

¹ Suzhou Key Laboratory for Nanophotonic and Nanoelectronic Materials and Its Devices, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu Province, China
² Gusu Lab Mat, Suzhou 215123, Jiangsu Province, China
³ Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China

Received:2023-11-10 Revised:2023-12-15 Accepted:2023-12-18 Published:2024-03-13
Contact: Email: liuqianqian@usts.edu.cn. Tel.: +86-15995837516 (Qianqian Liu)wldai@fudan.edu.cn. Tel.: +86-512-68097107 (Wei-Lin Dai)liubo@mail.usts.edu.cn (Bo Liu)
Supported by:
National Natural Science Foundation of China(22002102); National Natural Science Foundation of China(61904118); National Natural Science Foundation of China(62205231); Postgraduate Research & Practice Innovation Program of Jiangsu Province(SJCX22_1555); Jiangsu Key Laboratory for Environment Functional Materials

1. WHXB202311016补充材料.rar(7205KB)

摘要/Abstract

摘要：

定向电荷转移是调控光生载流子分离动力学的一种极具吸引力的策略。本文通过在SnNb₂O₆纳米片上原位生长C₃N₅纳米棒，设计一种具有强内建电场(IEF)和偶极场(DF)的新型2D/1D SnNb₂O₆/富氮C₃N₅ S型异质结。通过构筑S型异质结，在界面处产生IEF，促进电荷从SnNb₂O₆向C₃N₅的定向迁移。与此同时，C₃N₅中的DF提供一种驱动力，将光生电子定向转移至活性位点。通过IEF和DF的协同效应，SnNb₂O₆/C₃N₅异质结实现了快速的定向电子转移，从而显著提高了电荷分离效率。研究结果表明，SnNb₂O₆/C₃N₅异质结的最佳产氢速率高达1090.0 μmol∙g⁻¹·h⁻¹ (反应过程中持续释放H₂气泡)，分别是SnNb₂O₆和C₃N₅的38.8和10.7倍。此外，SnNb₂O₆/C₃N₅异质结在去除罗丹明B、四环素和Cr(Ⅵ)方面也表现出优异的光催化性能。通过电子顺磁共振(EPR)、时间分辨光致发光光谱(TPRL)和密度泛函理论(DFT)计算，本文系统探讨了SnNb₂O₆/C₃N₅异质结的定向电荷转移机制。这项研究为开发高效异质结光催化剂提供了一种可行的方法。

关键词: SnNb₂O₆/C₃N₅, 内建电场, 偶极场, 光催化性能, 定向电荷转移

Abstract:

Directional electron transfer is an appealing strategy for harnessing photogenerated charge separation kinetics. Herein, a novel 2D/1D SnNb₂O₆/nitrogen-enriched C₃N₅ S-scheme heterojunction with strong internal electric field (IEF) and dipole field (DF) is designed through in situ growth of C₃N₅ nanorods on SnNb₂O₆ nanosheets. The IEF generated at the interface via the formation of the S-scheme heterojunction induces directional charge transfer from SnNb₂O₆ to C₃N₅. Simultaneously, the DF within C₃N₅ provides the impetus to guide photo-excited electrons to the active sites. Consequently, the synergistic effects of IEF and DF facilitate swift directional electron transfer. The optimized SnNb₂O₆/C₃N₅ heterojunction demonstrates a remarkable H₂ production rate of 1090.0 μmol∙g⁻¹∙h⁻¹ with continuous release of H₂ bubbles. This performance surpasses that of SnNb₂O₆ and C₃N₅ by 38.8 and 10.7 times, respectively. Additionally, the SnNb₂O₆/C₃N₅ heterojunction exhibits superior activity in the removal of Rhodamine B, tetracycline, and Cr(Ⅵ). Based on electron paramagnetic resonance (EPR), time-resolved photoluminescence (TPRL) and density functional theory (DFT) calculations, etc., the directional charge transfer mechanism was systematically explored. The research furnishes a plausible approach to construct effective heterojunction photocatalysts for applications in energy and environmental domains.

Key words: SnNb₂O₆/C₃N₅, Internal electric field, Dipole field, Photocatalytic performance, Directional charge transfer

刘倩倩, 杜兴, 李宛飞, 戴维林, 刘波. 内建电场与偶极场协同增强SnNb₂O₆/富氮C₃N₅ S型异质结光催化性能[J]. 物理化学学报, 2024, 40(10), 2311016. doi: 10.3866/PKU.WHXB202311016

Qianqian Liu, Xing Du, Wanfei Li, Wei-Lin Dai, Bo Liu. Synergistic Effects of Internal Electric and Dipole Fields in SnNb₂O₆/Nitrogen-Enriched C₃N₅ S-Scheme Heterojunction for Boosting Photocatalytic Performance[J]. Acta Phys. -Chim. Sin. 2024, 40(10), 2311016. doi: 10.3866/PKU.WHXB202311016

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB202311016

https://www.whxb.pku.edu.cn/CN/Y2024/V40/I10/2311016

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内建电场与偶极场协同增强SnNb₂O₆/富氮C₃N₅ S型异质结光催化性能

Synergistic Effects of Internal Electric and Dipole Fields in SnNb₂O₆/Nitrogen-Enriched C₃N₅ S-Scheme Heterojunction for Boosting Photocatalytic Performance

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