研究目的
Investigating the sensitizing effects of BiVO4 and the visible light induced production of highly reductive electrons in the TiO2/BiVO4 heterojunction for potential applications in photocatalytic water splitting under visible light.
研究成果
The TiO2/BiVO4 heterojunction allows for the production of highly reductive electrons under visible light, demonstrating potential for applications in photocatalytic water splitting. The counterintuitive electron transfer mechanism from BiVO4 to TiO2 is facilitated by the band alignment at the heterojunction.
研究不足
The study is limited by the need for an intimate contact between TiO2 and BiVO4 for efficient electron transfer, and the energy difference between the conduction bands of the two materials which may limit the efficiency of electron transfer.
1：Experimental Design and Method Selection:
The study involved the preparation and photoelectrochemical characterization of TiO2/BiVO4 heterojunction electrodes to explore their photocatalytic water splitting capabilities under visible light.
2：Sample Selection and Data Sources:
Samples included TiO2, BiVO4, and TiO2/BiVO4 heterojunction films prepared through spin coating and characterized using UV-visible absorption spectra, X-ray powder diffraction, and scanning electron microscopy.
3：List of Experimental Equipment and Materials:
Equipment used included a Jasco V-670 spectrophotometer, Philips PW1820 X-ray powder diffractometer, LEO 1430 SEM, and an Oriel solar simulator. Materials included titanium diisopropoxide bis(acetylacetonate), ammonium metavanadate, bismuth(III) nitrate pentahydrate, and others.
4：Experimental Procedures and Operational Workflow:
The films were prepared under nitrogen atmosphere, characterized for their optical and structural properties, and tested for photoelectrochemical performance and photocatalytic reduction of methyl viologen under visible light.
5：Data Analysis Methods:
Data analysis involved comparing the photocurrent density, incident photon to current efficiency, and photocatalytic reduction efficiency of the materials.
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