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

doi:10.15541/jim20200358

Abstract

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

CLC Number:

O643

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.

Figures/Tables 6

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

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

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

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

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

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

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