Preparation of a p-n heterojunction 2D BiOI nanosheet/1DBiPO4 nanorod composite electrode for enhanced visible light photoelectrocatalysis

doi:10.1016/S1872-2067(18)63186-9

Abstract

Abstract:

In this study, a 2D BiOI nanosheet/1D BiPO₄ nanorod/fluorine-doped tin oxide (FTO) composite electrode with a p-n heterojunction structure was prepared by a two-step electrodeposition method. Field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-visible diffuse reflectance spectroscopy, and electrochemical testing were used to characterize its composition, crystal morphology, and optical properties. The BiOI/BiPO₄/FTO composite electrode has higher photoelectrocatalytic (PEC) activity for the degradation of tetracycline than pure BiPO₄ and BiOI. The PEC activity of the composite was 1.98 times and 2.46 times higher than those of the BiOI/FTO and BiPO₄/FTO electrodes, respectively. The effects of the working voltage and BiOI deposition time on the degradation of tetracycline were investigated. The optimum BiOI deposition time was found to be 150 s and the optimum working voltage is 1.2 V. Trapping experiments showed that hydroxyl radicals (·OH) and superoxide radicals (·O₂^-) are the major reactive species in the PEC degradation process. The BiOI/BiPO₄/FTO composite electrode has good stability, and the tetracycline removal efficiency remains substantially unchanged after four cycles in a static system. The reason for the PEC efficiency enhancement in the BiOI/BiPO₄/FTO composite electrode is the increased visible light absorption range and the p-n heterojunction structure, which promotes the separation and migration of the photogenerated electrons and holes.

Key words: Electrodeposition, Photoelectrocatalysis, BiOI/BiPO₄/FTO, Tetracycline

Sen Liu, Mengyu Zhao, Zetian He, Yi Zhong, Hao Ding, Daimei Chen. Preparation of a p-n heterojunction 2D BiOI nanosheet/1DBiPO₄ nanorod composite electrode for enhanced visible light photoelectrocatalysis[J]. Chinese Journal of Catalysis, 2019, 40(3): 446-457.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63186-9

https://www.cjcatal.com/EN/Y2019/V40/I3/446

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Preparation of a p-n heterojunction 2D BiOI nanosheet/1DBiPO₄ nanorod composite electrode for enhanced visible light photoelectrocatalysis

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