Construction of one dimensional ZnWO4@SnWO4 core-shell heterostructure for boosted photocatalytic performance

doi:10.1016/j.jmst.2019.05.036

Abstract

Abstract:

The one-dimensional ZnWO₄@SnWO₄ photocatalyst with a core-shell heterostructure was successfully constructed by a simple two-step method. It is interesting to note that ZnWO₄@SnWO₄ composite photocatalyst owns a higher photocatalytic activity for RhB degradation under visible light irradiation. The introduction of SnWO₄ shell layer, which forms a clear heterogenous interface between ZnWO₄ and SnWO₄, increases the photo-absorption efficiency of ZnWO₄ nanorods. In addition, its band-edge absorption evidently shifts toward the visible region. Based on the photoelectrochemical (PEC) and electron spin resonance (ESR) measurements, it is found that the photocatalytic activity was attributed to the efficient separation and transfer of photo-generated charge carriers. Hence, they can produced more hydroxyl radical (?OH) as the main active species in the photocatalytic reaction process.

Key words: ZnWO₄@SnWO₄, Core-shell, Heterostructure, Photocatalyst, Visible light

Huaqiang Zhuang, Wentao Xu, Liqin Lin, Mianli Huang, Miaoqiong Xu, Shaoyun Chen, Zhenping Cai. Construction of one dimensional ZnWO₄@SnWO₄ core-shell heterostructure for boosted photocatalytic performance[J]. J. Mater. Sci. Technol., 2019, 35(10): 2312-2318.

Figures/Tables 8

Fig. 1. SEM images of (a, b) ZnWO4 nanorods and (c, d) ZnWO4@SnWO4 heterostructure.

Fig. 2. TEM images of (a) ZnWO4 nanorods and (b, c) ZnWO4@SnWO4 heterostructure, (d) HRTEM image of ZnWO4@SnWO4 heterostructure and (e) energy dispersive spectroscopy mapping images of ZnWO4@SnWO4 heterostructure.

Fig. 3. XRD patterns of ZnWO4, SnWO4 and ZnWO4@SnWO4 samples.

Fig. 4. UV-vis DRS spectra of ZnWO4, SnWO4 and ZnWO4@SnWO4 samples.

Fig. 5. High resolution XPS spectra of (a) O 2p, (b) W 4f, (c) Zn 2p and (d) Sn 3d for ZnWO4@SnWO4 heterostructure.

Fig. 6. Photocatalytic activity of RhB degradation for Blank, ZnWO4, ZnWO4/SnWO4 and ZnWO4@SnWO4 samples under visible light irradiation.

Fig. 7. ESR signal of DMPO-?OH spin adducts for ZnWO4@SnWO4 heterostructure under visible light irradiation.

Scheme 1.. Proposed mechanism of ZnWO4@SnWO4 heterostructure for enhanced photocatalytic activity.

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Construction of one dimensional ZnWO₄@SnWO₄ core-shell heterostructure for boosted photocatalytic performance

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