研究目的
To achieve overall water splitting under visible light using a CdS/WO3/CdWO4 tricomposite photocatalyst by suppressing photocorrosion of CdS.
研究成果
The study achieved overall water splitting under visible light using a CdS/WO3/CdWO4 tricomposite photocatalyst by suppressing photocorrosion of CdS. The method opens new avenues for discovering novel photocatalyst combinations for efficient water splitting.
研究不足
The efficiency of water decomposition obtained was very low and complete suppression of the photocorrosion was not achieved. Further refinement of cocatalysts and mediators is necessary.
1：Experimental Design and Method Selection:
The study involved synthesizing a CdS/WO3/CdWO4 tricomposite photocatalyst through a two-step process and characterizing it using XRD, DRS, TEM/EDS, HRTEM, and XPS.
2：Sample Selection and Data Sources:
CdS was synthesized from Na2S·9H2O and Cd(NO3)2·4H2O, and WO3 and CdWO4 were composited by adding HCl to Na2WO4·2H2O solution.
3：List of Experimental Equipment and Materials:
Instruments included XRD (Ultima IV, Rigaku), DRS (U-3900/3900H spectrophotometer, Hitachi High-Tech Science), TEM/EDS (EM-002BF, Topcon), HRTEM (JEM-2100, JEOL), and XPS (JPS-9010MC, JEOL Ltd.).
4：Experimental Procedures and Operational Workflow:
The tricomposite was synthesized, characterized, and tested for photocatalytic water splitting under visible light.
5：Data Analysis Methods:
The amounts of evolved hydrogen and oxygen were determined using gas chromatography.
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X-ray diffractometer
Ultima IV
Rigaku
Characterization of the prepared composite materials
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HRTEM
JEM-2100
JEOL
High-resolution transmission electron microscopy
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XPS
JPS-9010MC
JEOL Ltd.
X-ray photoelectron spectroscopy analysis
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Gas chromatograph
GC-8A
Shimadzu
Determination of the amounts of evolved hydrogen and oxygen
GC-8A Series Gas Chromatograph
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Spectrophotometer
U-3900/3900H
Hitachi High-Tech Science
Diffuse reflection spectroscopy
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TEM/EDS
EM-002BF
Topcon
Transmission electron microscopy/energy-dispersive X-ray spectrometry
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Xe lamp
CERMAX LX-300
ILC Technology
Visible-light source for hydrogen evolution experiments
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