双铁电复合材料的制备及其光电化学性能研究

doi:10.15541/jim20190516

摘要/Abstract

摘要：

通过模板法制备钒酸铋(BiVO₄)薄膜, 用溶胶-凝胶法制备铁电材料铁酸铋(BiFeO₃)并对BiVO₄进行修饰, 以半导体复合的方式提高BiVO₄的光电化学性能。电化学测试结果表明, 经BiFeO₃修饰后, BiVO₄薄膜的光电化学性能有所提高, 其中经BiFeO₃旋涂5次后的BiVO₄薄膜具有最优的光电化学性能, 光电流密度达到0.72 mA·cm^-2, 较未修饰样品提高了67.4%。利用外场极化调节能带弯曲可以显著地提高BiVO₄/nBiFeO₃铁电复合物的光电化学性能, 复合物经正极化20 V电压处理后的光电流密度最高为0.91 mA·cm^-2, 比BiVO₄薄膜提升了1倍以上, 具有良好的光电化学性能。BiFeO₃与BiVO₄复合后有利于形成异质结, 促进光生电子、光生空穴的产生与分离, 并且外场极化调节能带弯曲使光生电荷加速转移, 是铁电复合物光电化学性能提高的主要原因。

关键词: BiVO₄, BiFeO₃, 铁电复合材料, 光电化学性能

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

中图分类号:

TQ174

张亚萍,雷宇轩,丁文明,于濂清,朱帅霏. 双铁电复合材料的制备及其光电化学性能研究[J]. 无机材料学报, 2020, 35(9): 987-992.

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.

图/表 8

图1 BVO/nBFO复合物的制备示意图

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

图2 BVO/5BFO、BVO、BFO、FTO的XRD图谱

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

图3 (a) BiOI、(b) BVO、(c) BVO/5BFO的表面SEM照片; BVO/5BFO的(d)截面SEM照片和(e~h) EDS mapping图像

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

图4 BVO/5BFO、BVO、BFO的拉曼光谱图

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

图5 BFO、BVO和BVO/nBFO的(a)光致发光光谱图和(b)紫外-可见吸收光谱图

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

图6 BVO, BFO, BVO/nBFO的(a) I-t曲线、(b)线性伏安曲线、(c)电化学阻抗谱图、(d)莫特-肖特基曲线; (e)BVO/5BFO的循环稳定性曲线

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

图7 BVO/5BFO极化前后的(a) I-t曲线和(b)线性伏安曲线

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

图8 BVO/nBFO复合物的能带结构示意图

Fig. 8 Schematic diagram of BVO/nBFO band energy

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