Preparation and Photoelectrochemical Property of the Dual-ferroelectric Composited Material

doi:10.15541/jim20190516

Abstract

Abstract:

BiVO₄ film was synthesized via template method, the ferroelectric material BiFeO₃ was prepared by Sol-Gel method to modify BiVO₄. By means of dual-ferroelectric semiconductor composition, the photochemical properties of BiVO₄ was greatly improved. The electrochemical test results show that the superior photoelectrochemical properties of BiVO₄ film are achieved after spin-coating with BiFeO₃ for 5 times. It owns an optimal photocurrent density of 0.72 mA·cm^-2, which is 67.4% higher than that of pure BiVO₄. The energy band bending regulation via electric field polarization could further boost the photoelectrochemical property of BiVO₄/nBiFeO₃ferroelectric composite. The highest photocurrent density of the composite after polarization at 20 V reaches 0.91 mA·cm^-2, which is more than twice of pure BiVO₄ film. The combination of BiFeO₃ and BiVO₄is favorable for forming heterojuncting, generating and separating of photogenic electrons and holes. The electric field polarization regulating band bending accelerates the photogenic charge transfer, which is the main reason for the improved photoelectrochemical properties of ferroelectric composite.

Key words: BiVO₄, BiFeO₃, ferroelectric composite material, photoelectrochemical property

CLC Number:

TQ174

ZHANG Yaping,LEI Yuxuan,DING Wenming,YU Lianqing,ZHU Shuaifei. Preparation and Photoelectrochemical Property of the Dual-ferroelectric Composited Material[J]. Journal of Inorganic Materials, 2020, 35(9): 987-992.

Figures/Tables 8

Fig. 1 Schematic diagram for preparation of BVO/nBFO composite

Fig. 2 XRD patterns of BVO/5BFO, BVO, BFO, and FTO

Fig. 3 Surface SEM images of (a) BiOI, (b) BVO, (c) BVO/ 5BFO, and (d) Cross-sectional SEM image and (e-h) EDS mapping images of BVO/5BFO

Fig. 4 Raman spectra of BVO/5BFO, BVO and BFO

Fig. 5 (a) PL and (b) UV-Vis spectra of BFO, BVO and BVO/nBFO

Fig. 6 (a) I-t curves, (b) linear sweep voltammograms, (c) Nyquist plots, (d) Mott-Schottky plots of BFO, BVO, and BVO/nBFO, and (e) recycling performance of BVO/5BFO

Fig. 7 (a) I-t plots and (b) linear sweep voltammograms of BVO/5BFO before and after polarization

Fig. 8 Schematic diagram of BVO/nBFO band energy

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