CsPbBr3@TiO2核壳结构纳米复合材料用作水稳高效可见光催化剂

doi:10.15541/jim20200358

无机材料学报 ›› 2021, Vol. 36 ›› Issue (5): 507-512.DOI: 10.15541/jim20200358

所属专题：【虚拟专辑】钙钛矿材料(2020~2021)；【能源环境】量子点；【能源环境】钙钛矿

CsPbBr₃@TiO₂核壳结构纳米复合材料用作水稳高效可见光催化剂

肖翔(), 郭少柯, 丁成, 张志洁(), 黄海瑞, 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:2020-06-30 修回日期:2020-08-27 出版日期:2021-05-20 网络出版日期:2021-04-19
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:肖翔(1995-), 男, 硕士研究生. E-mail:18856267707@163.com
基金资助:
国家自然科学基金(51972213)

CsPbBr₃@TiO₂ Core-shell Structure Nanocomposite as Water Stable and Efficient Visible-light-driven Photocatalyst

XIAO Xiang(), GUO Shaoke, DING Cheng, ZHANG Zhijie(), HUANG Hairui, XU Jiayue()

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

Received:2020-06-30 Revised:2020-08-27 Published:2021-05-20 Online:2021-04-19
Contact: ZHANG Zhijie, associate professor. E-mail: zjzhang@sit.edu.cn; XU Jiayue, professor. E-mail: xujiayue@sit.edu.cn
About author:XIAO Xiang(1995-), male, Master candidate. E-mail:18856267707@163.com
Supported by:
National Natural Science Foundation of China(51972213)

摘要/Abstract

摘要：

CsPbBr₃钙钛矿量子点在水中的不稳定性一直是限制其应用的关键因素。本工作采用钛酸四丁酯水解结合煅烧的方法在CsPbBr₃表面包覆TiO₂保护层, 制备了一种具有良好水稳定性和光催化活性的CsPbBr₃@TiO₂核壳结构纳米复合材料。所合成的CsPbBr₃钙钛矿量子点尺寸约为8 nm, 包覆层为不完全结晶的TiO₂, 其厚度约为20 nm。采用在可见光下降解水中有机污染物罗丹明B表征了CsPbBr₃@TiO₂复合材料的光催化性能。结果表明, CsPbBr₃@TiO₂复合材料的光催化性能远优于纯TiO₂和CsPbBr₃钙钛矿量子点。光电流测试结果表明, CsPbBr₃和TiO₂形成的异质结构能够促进光生载流子的分离, 从而提升CsPbBr₃@TiO₂复合材料光催化性能。更重要的是, TiO₂可以作为CsPbBr₃的保护层将CsPbBr₃和水分隔开来, 使得CsPbBr₃@TiO₂复合材料具有很好的水稳定性。经过光催化降解污染物之后, 回收的CsPbBr₃@TiO₂复合材料的形貌、发光和光催化性能保持不变。

关键词: CsPbBr₃@TiO₂, 纳米复合材料, 光催化, 电荷分离

Abstract:

The inherent poor stability of CsPbBr₃ perovskite quantum dots (QDs) is the main impediment restricting their applications. In this work, a CsPbBr₃@TiO₂ core-shell structure nanocomposite with high water stability and efficient photocatalytic activity was fabricated through the hydrolysis of tetrabutyl titanate, followed by calcination. The as-prepared CsPbBr₃QDs have a size of ca. 8 nm, encapsulated by incompletely crystallized TiO₂protective layer with a thickness of ca. 20 nm. The photocatalytic performance of the CsPbBr₃@TiO₂ nanocomposite was investigated by degradation of Rhodamine B (RhB) in water under visible light irradiation. The result shows that the CsPbBr₃@TiO₂ nanocomposite exhibits much more enhanced photocatalytic activity than pure TiO₂ and CsPbBr₃ perovskite quantum dots. The photocurrent test results showed that the formation of the CsPbBr₃@TiO₂heterostructure can promote the separation of photogenerated carriers, which led to the improvement of photocatalytic performance of the composite material. More importantly, TiO₂ can act as a protective layer to separate CsPbBr₃ from water, which brings about the high water stability of the CsPbBr₃@TiO₂ nanocomposite. After photocatalytic degradation of pollutants, the recovered CsPbBr₃@TiO₂ nanocomposite retained its original morphology, luminescent and photocatalytic properties.

Key words: CsPbBr₃@TiO₂, nanocomposite, photocatalysis, charge separation

中图分类号:

O643

肖翔, 郭少柯, 丁成, 张志洁, 黄海瑞, 徐家跃. CsPbBr₃@TiO₂核壳结构纳米复合材料用作水稳高效可见光催化剂[J]. 无机材料学报, 2021, 36(5): 507-512.

XIAO Xiang, GUO Shaoke, DING Cheng, ZHANG Zhijie, HUANG Hairui, XU Jiayue. CsPbBr₃@TiO₂ Core-shell Structure Nanocomposite as Water Stable and Efficient Visible-light-driven Photocatalyst[J]. Journal of Inorganic Materials, 2021, 36(5): 507-512.

图/表 6

图1 CsPbBr3、TiO2和CsPbBr3@TiO2的XRD图谱

Fig. 1 XRD patterns of CsPbBr3, TiO2 and CsPbBr3@TiO2

图2 CsPbBr3(a)和CsPbBr3@TiO2(b)的TEM照片; (c)CsPbBr3@TiO2的高分辨TEM照片

Fig. 2 TEM images of CsPbBr3 (a) and CsPbBr3@TiO2 (b), and (c) HRTEM image of CsPbBr3@TiO2

图3 CsPbBr3、TiO2和CsPbBr3@TiO2的傅里叶变换红外光谱

Fig. 3 FT-IR spectra of CsPbBr3, TiO2 and CsPbBr3@TiO2

图4 (a)CsPbBr3@TiO2的XPS全谱图; (b)Ti2p和(c)O1s的XPS 高分辨分峰拟合谱

Fig. 4 Survey XPS spectrum of CsPbBr3@TiO2 (a), and high resolution XPS spectra of Ti2p (b) and O1s (c)

图5 (a) CsPbBr3、TiO2和CsPbBr3@TiO2 在可见光下降解罗丹明B的光催化性能比较; (b)降解实验后回收的CsPbBr3@TiO2复合材料的TEM照片; (c)降解实验前后CsPbBr3@TiO2的PL光谱对比图; (d) CsPbBr3@TiO2降解罗丹明B的循环实验

Fig. 5 (a) Comparison of photocatalytic activities of CsPbBr3, TiO2 and CsPbBr3@TiO2 for degradation of Rhodamine B under visible light irradiation; (b) TEM image of recycled CsPbBr3@TiO2 after the degradation experiment; (c) Comparison of PL spectra of CsPbBr3@TiO2 before and after the degradation experiment; (d) Cycle runs of the photocatalytic degradation of RhB over CsPbBr3@TiO2

图6 (a)CsPbBr3、TiO2和CsPbBr3@TiO2的光电流; (b)CsPbBr3@TiO2复合材料的光催化机理示意图

Fig. 6 (a) Photocurrent responses of CsPbBr3, TiO2 and CsPbBr3@TiO2, and (b) Photocatalytic mechanism of CsPbBr3@TiO2 composite

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CsPbBr₃@TiO₂核壳结构纳米复合材料用作水稳高效可见光催化剂

CsPbBr₃@TiO₂ Core-shell Structure Nanocomposite as Water Stable and Efficient Visible-light-driven Photocatalyst

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