期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 23, 期 6, 页码 1757-1765出版社
SPRINGER
DOI: 10.1007/s10008-019-04270-0
关键词
Precipitation-peptization method; Heterojunction; Nanoparticles; Salicylic acid oxidation; Photoelectrochemical activity
资金
- Colciencias
Semiconductor heterojunction of -Bi2O3-TiO2/ITO thin films was prepared by aqueous sol-gel and their photoelectrochemical and photoelectrocatalytic properties were evaluated on the oxidation of salicylic acid. The -Bi2O3 sol precursor properties were characterized by DLS, SEM, and X-ray diffraction. The composition and morphology of the films were characterized by SEM-EDS. The photoelectrochemical characterization was performed by linear sweep voltammetry with chopped light irradiation and photocurrent measurements. The photoelectrocatalytic activity of the films under UV-Vis and visible light irradiation was conducted on the oxidation of salicylic acid. Results show that the films are composed of a TiO2 layer with Bi2O3 particles dispersed throughout the surface. X-ray diffraction results confirm that the Bi2O3 obtained from the sol precursor prepared corresponds to -tetragonal phase. The linear sweep voltammetry shows that the -Bi2O3-TiO2/ITO films have a higher photocurrent in the anodic region than TiO2/ITO films used as reference. The photoelectrocatalytic activity of the -Bi2O3-TiO2/ITO films on the oxidation of salicylic acid under visible light irradiation was higher than TiO2/ITO films. The results show that the -Bi2O3-TiO2/ITO films are active under visible light and can be used in photoelectrochemical cells.
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