研究目的
To design an efficient tandem photoelectrochemical cell composed of FeOOH/TiO2/BiVO4 and Cu2O for self-driven solar water splitting without external bias.
研究成果
The FeOOH modified TiO2/BiVO4-Cu2O tandem cell exhibited 5.3 times higher output photocurrent than bare BiVO4-Cu2O system and the solar conversion efficiency is approximately 0.46% at zero bias. The amounts of hydrogen and oxygen evolved by the tandem PEC cell without bias are 2.36 mmol/cm2 and 1.09 mmol/cm2 after testing for 2.5 h.
研究不足
The essential defects of the p-Cu2O limit the short-circuit current density of the self-driven efficiency. The tandem PEC cell still remains about 58% of the initial photocurrent density after testing for 2.5 h.
1：Experimental Design and Method Selection:
The study involved the design of a tandem cell using FeOOH modified TiO2/BiVO4 as a photoanode and p-Cu2O as a photocathode. The methodology included electrochemical deposition, chemical bath, and photoelectrochemical deposition techniques.
2：Sample Selection and Data Sources:
BiVO4 photoanodes were prepared by electrochemical deposition, and Cu2O photocathodes were prepared by electrochemical deposition. The samples were characterized using XRD, SEM, UV-Vis spectra, XPS, and photoelectrochemical measurements.
3：List of Experimental Equipment and Materials:
A typical three-electrode cell was used for electrodeposition with a fluorine-doped tin oxide (FTO) glass as working electrode, a Ag/AgCl (4 M KCl) electrode as the reference electrode, and a platinum electrode as the counter electrode. A Zahner electrochemical workstation was used for current measurements.
4：Experimental Procedures and Operational Workflow:
The BiVO4 photoanodes were prepared by electrodeposition, followed by coating with TiO2 and modification with FeOOH. The Cu2O photocathodes were prepared by electrodeposition. The tandem cell was assembled and tested under AM 1.5G illumination.
5：5G illumination. Data Analysis Methods:
5. Data Analysis Methods: The photoelectrochemical properties were analyzed using linear sweep voltammetry, Mott-Schottky plots, and intensity-modulated photocurrent spectroscopy (IMPS).
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X-ray photoelectron spectrograph
ESCALAB250Xi
Thermo Fisher-VG Scientific
Detecting the chemical composition and the valence states
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X-ray diffraction
D/Max 2250
Rigaku Corporation
Investigating the crystalline phases of the samples
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Scanning electron microscopy
JSM6700F
JEOL Company
Measuring the surface and cross-sectional morphology and particle sizes
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FTO glass
Working electrode in the electrodeposition process
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Ag/AgCl electrode
4 M KCl
Reference electrode in the electrodeposition process
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Platinum electrode
Counter electrode in the electrodeposition process
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Zahner electrochemical workstation
Zennium
Zahner
Recording the current in a two-electrode configuration
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UV-Vis spectrophotometer
PGeneral TU-1901
Obtaining UV-Vis spectra of the films
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