CsPbBr3钙钛矿量子点/C3N4超薄纳米片0D/2D复合材料: 增强的稳定性和光催化活性

doi:10.15541/jim20200744

无机材料学报 ›› 2021, Vol. 36 ›› Issue (11): 1217-1222.DOI: 10.15541/jim20200744

所属专题：【虚拟专辑】钙钛矿材料(2020~2021)；【能源环境】量子点；【信息功能】Max层状材料、MXene及其他二维材料；【能源环境】钙钛矿

CsPbBr₃钙钛矿量子点/C₃N₄超薄纳米片0D/2D复合材料: 增强的稳定性和光催化活性

舒孟洋(), 陆嘉琳, 张志洁(), 沈涛, 徐家跃()

上海应用技术大学材料科学与工程学院, 上海 201418

收稿日期:2020-12-30 修回日期:2021-04-01 出版日期:2021-11-20 网络出版日期:2021-05-10
通讯作者: 张志洁, 副教授. E-mail: zjzhang@sit.edu.cn;徐家跃, 教授. E-mail: xujiayue@sit.edu.cn
作者简介:舒孟洋(1996-), 男, 硕士研究生. E-mail: 277550283@qq.com

CsPbBr₃ Perovskite Quantum Dots/Ultrathin C₃N₄ Nanosheet 0D/2D Composite: Enhanced Stability and Photocatalytic Activity

SHU Mengyang(), LU Jialin, ZHANG Zhijie(), SHEN Tao, XU Jiayue()

School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China

Received:2020-12-30 Revised:2021-04-01 Published:2021-11-20 Online:2021-05-10
Contact: ZHANG Zhijie, associate professor. E-mail: zjzhang@sit.edu.cn;XU Jiayue, professor. E-mail: xujiayue@sit.edu.cn
About author:SHU Mengyang(1996-), male, Master candidate. E-mail: 277550283@qq.com
Supported by:
National Natural Science Foundation of China(51972213)

摘要/Abstract

摘要：

金属卤化物钙钛矿量子点(QDs)具有良好的光电性质, 是一种潜在的光催化剂材料。但是, 它的稳定性较差, 并且电荷传输效率不足, 阻碍了其在光催化领域的应用。本工作将CsPbBr₃量子点装饰在二维超薄g-C₃N₄纳米片(UCN)上, 制备了0D/2D CsPbBr₃/UCN复合光催化剂。引入UCN不仅可以通过钝化CsPbBr₃ 量子点的表面配体来提高CsPbBr₃量子点的稳定性, 而且两者的能带匹配还可以促进两种材料之间的电荷转移。因此, 所制备的CsPbBr₃/UCN异质结构比单纯的CsPbBr₃量子点和UCN具有更优越的光催化性能, 这为设计具有高稳定性和光催化活性的基于CsPbX₃的异质结构提供了有效的策略。

关键词: 钙钛矿量子点, 二维超薄纳米片, 光催化, CsPbBr₃, g-C₃N₄

Abstract:

Metal-halide perovskite quantum dots (QDs) have emerged as a potential photocatalyst owing to their remarkable optoelectronic properties. However, the poor stability and insufficient charge transportation efficiency of this type of materials hindered their applications in the photocatalysis field. Herein, we decorated CsPbBr₃ QDs on two-dimensional (2D) ultrathin g-C₃N₄ (UCN) nanosheets to develop a 0D/2D CsPbBr₃/UCN composite photocatalyst. The introduction of UCN can not only improve the stability of CsPbBr₃ QDs by passivating the surface ligands of CsPbBr₃ QDs, but also facilitate the charge transfer due to the suited band gap alignment. Consequently, the obtained CsPbBr₃/UCN heterostructure exhibited superior photocatalytic performance to both pristine CsPbBr₃ QDs and UCN. This work has provided an efficient strategy for the design of CsPbX₃-based heterostructure with high stability and photocatalytic activity.

Key words: perovskite quantum dots, 2D ultrathin nanosheets, photocatalysis, CsPbBr₃, g-C₃N₄

中图分类号:

O649

舒孟洋, 陆嘉琳, 张志洁, 沈涛, 徐家跃. CsPbBr₃钙钛矿量子点/C₃N₄超薄纳米片0D/2D复合材料: 增强的稳定性和光催化活性[J]. 无机材料学报, 2021, 36(11): 1217-1222.

SHU Mengyang, LU Jialin, ZHANG Zhijie, SHEN Tao, XU Jiayue. CsPbBr₃ Perovskite Quantum Dots/Ultrathin C₃N₄ Nanosheet 0D/2D Composite: Enhanced Stability and Photocatalytic Activity[J]. Journal of Inorganic Materials, 2021, 36(11): 1217-1222.

图/表 7

Scheme 1 Illustration of the preparation process of CsPbBr3/ UCN composite.

Fig. 1 XRD patterns of CsPbBr3, UCN and CsPbBr3/UCN composite

Fig. 2 TEM image of (A) CsPbBr3 QDs, (B) UCN and (C) CsPbBr3/UCN composite; (D) HRTEM image of CsPbBr3/ UCN composite

Fig. 3 UV-Vis diffuse reflectance spectra of CsPbBr3, UCN and CsPbBr3/UCN composite

Fig. 4 (A) Photocatalytic degradation of RhB over CsPbBr3, BCN, UCN and CsPbBr3/UCN composite; (B) XRD patterns of recycled CsPbBr3 and CsPbBr3/UCN composite

Fig. 5 (A) PL spectra and (B) transient photocurrent responses of CsPbBr3, UCN and CsPbBr3/UCN composite

Fig. 6 (A) Electrochemical Mott-Schottky plots and (B) band alignments of CsPbBr3 and UCN

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CsPbBr₃钙钛矿量子点/C₃N₄超薄纳米片0D/2D复合材料: 增强的稳定性和光催化活性

CsPbBr₃ Perovskite Quantum Dots/Ultrathin C₃N₄ Nanosheet 0D/2D Composite: Enhanced Stability and Photocatalytic Activity

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