Synthesis of Bismuth Vanadate by a Novel Process and Its Enhanced Photoelectrochemical Performance

7th Annual International Conference on Materials Science and Engineering

Yu, Fengkai^1 ; Zhang, Yan^1 ; Ren, Xiangzhong^2 ; Yang, Meijun^1 ; Yu, Jianqiang^1

School of Chemistry and Chemical Engineering, Qingdao University, Qingdao

266071, China^1

Jinan Institute of Chemical Engineering, Jinan

250000, China^2

关键词: Bismuth vanadates;    Electrochemical impedance spectroscopy measurements;    Hydrothermal process;    Photocurrent density;    Photoelectrochemical performance;    Photogenerated charge;    Synthesized materials;    Water splitting;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/562/1/012097/pdf
DOI  :  10.1088/1757-899X/562/1/012097

来源: IOP

【 摘 要 】

Highly crystalline monoclinic scheelite BiVO4 were synthesized by a hydrothermal process from strong redox reaction of VOC2O4 and NaBiO3 solutions over a wide range of pH. A simple electrophoresis process was employed to fabricate the BiVO4 thin films photoelectrochemical cell, which was used as photoanodes for water splitting. It can be found that the photoelectrochemical performance of the BiVO4 thin-film is strongly dependent on the pH used in the synthesis. It demonstrated that the distortion and polarization of the local structure of the synthesized material dependent greatly on the pH condition during the synthesis. Moreover, upon pH=1, the photocurrent density increase. While the Flat band of these bismuth vanadate shifts to positive as the pH decrease, which means the Fermi Energy Level (Ef) is risen as the pH decrease, as well as the conductive band (CB). Electrochemical impedance spectroscopy (EIS) measurements suggested that the sample of pH=1 showed the highest rate of photogenerated charge transfer.