Electrochemical In-situ Synthesis and Photocatalytic Properties of BiF3 Thin Films†

doi:10.7503/cjcu20180001

Abstract

Abstract:

BiF₃ thin films were prepared by simple in-situ electrochemical method at room temperature. The X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), UV-Vis diffuse reflection spectroscopy(UV-Vis DRS) and density functional theory(DFT) were employed to characterize the crystallinities, structures, morphologies, optical properties and energy band structures of the as-prepared BiF₃ thin films. The photocatalytic activity and stability of BiF₃ thin films were evaluated by the degradation of Rhodamine B(RhB) under simulated sunlight irradiation. The results show that the BiF₃ thin films exhibit the nanosheet structure with high purity, excellent photocatalytic activity and stability. The conduction band minimum and the valence band maximum of BiF₃ thin films are mainly contributed by Bi₆_p and F₂_p orbital electrons, respectively. It was also found that, with the increase of electrolyte concentration, the structural morphologies of BiF₃ thin films changed, resulting in that the photocatalytic activity of BiF₃ thin films first enhances and then decreases. When the electrolyte concentration is 1.5%, the BiF₃ nano-film is obviously staggered, which is conducive to the transport of reactants and light reflection, thereby increasing the reaction space of catalyst and the utilization efficiency of light. The photocatalytic degradation efficiency of RhB reaches 99.2% after 5 h simulated solar light irradiation, and still remains above 81% after being used 4 times. The possible formation mechanism of BiF₃ thin films on Bi plate via novel in-situ electrochemical method was proposed.

Key words: BiF₃, Electrochemical method, Thin film, Photocatalysis, In-situ synthesis

CLC Number:

O646

TrendMD:

ZHAO Zu, LI Rui, ZHANG Xiaochao, ZHANG Changming, LIU Jianxin, WANG Yawen, WANG Yunfang, FAN Caimei. Electrochemical In-situ Synthesis and Photocatalytic Properties of BiF₃ Thin Films^†[J]. Chem. J. Chinese Universities, 2018, 39(8): 1775.

Figures/Tables 8

Fig.1 XRD patterns of as-prepared samplesa. 1.0%-BiF3; b. 1.5%-BiF3; c. 2.0%-BiF3.

Fig.2 SEM images of 1.0%-BiF3(A), 1.5%-BiF3(B), 2.0%-BiF3 thin films(C)

Fig.3 TEM(A) and HRTEM(B) images of 1.5%-BiF3 thin film

Fig.4 UV-Vis DRS of BiF3 thin films with different NH4F contentsa. 1.0%-BiF3; b. 1.5%-BiF3; c. 2.0%-BiF3.

Fig.5 Photocatalytic activities of 1.0%-BiF3, 1.5%-BiF3, 2.0%-BiF3 thin films and BiF3 powder(A) and results of photocatalytic recycling experiment of 1.5%-BiF3 thin film(B) under simulated solar light irradiationa. No catalyst; b. 1.0%-BiF3; c. 1.5%-BiF3; d. 2.0%-BiF3; e. BiF3.

Fig.6 Band structure of BiF3 crystalInset is the crystal cell model.

Fig.7 Electronic structure of BiF3 crystal

Scheme 1 Possible formation mechanism of BiF3 thin films

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Electrochemical In-situ Synthesis and Photocatalytic Properties of BiF₃ Thin Films^†

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