研究目的
To develop a one-step in-situ hydrothermal method for synthesizing hierarchical AuNPs/Cd0.5Zn0.5S nanoarchitectures and evaluate their efficiency as photocatalysts for hydrogen production under visible light irradiation.
研究成果
The one-step in-situ hydrothermal method successfully produces hierarchical AuNPs/Zn0.5Cd0.5S nanocomposites with enhanced photocatalytic hydrogen production due to uniform AuNP incorporation, SPR effect, and improved electron transfer. The 5 wt% AuNPs/Zn0.5Cd0.5S shows a hydrogen evolution rate of 12.18 mmol g?1 h?1, significantly higher than controls. This method offers a simple and efficient route for fabricating high-performance heterocatalysts, with potential for future applications in renewable energy.
研究不足
The study is limited to laboratory-scale synthesis and testing; scalability and long-term stability in industrial applications are not addressed. The use of sacrificial reagent TEOA may not be sustainable for large-scale hydrogen production. The method's applicability to other photocatalyst systems is not explored.
1：Experimental Design and Method Selection:
A one-pot in-situ hydrothermal method was used to fabricate AuNPs/Zn0.5Cd0.5S with different gold content. The method involves adjusting pH, heating in an autoclave, and drying. For comparison, Zn0.5Cd0.5S, AuNPs/CdS, AuNPs/ZnS, and AuNPs/Zn0.5Cd0.5S via photodeposition were also prepared.
2：5Cd5S with different gold content. The method involves adjusting pH, heating in an autoclave, and drying. For comparison, Zn5Cd5S, AuNPs/CdS, AuNPs/ZnS, and AuNPs/Zn5Cd5S via photodeposition were also prepared. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Samples were synthesized using chemicals from Aladdin and Sinopharm, with high-purity water. Gold content was varied from 2.5 to 12.5 wt%.
3：5 to 5 wt%. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Chemicals include GSH, Zn(Ac)2·2H2O, Cd(Ac)2·2H2O, HAuCl4·4H2O, NaOH, TEOA, Na2SO4. Equipment includes autoclave, TEM (Tecnai G2 F30 S-TWIN), XPS (ESCALAB250 Xi), BET (ASAP 2020 HD88), XRD (D8 Advance), PL spectrophotometer (F-4500), time-resolved spectroscopy (PLS20), FTIR (Tensor 27), UV-vis spectrophotometer (Cary-5000), electrochemical station (Interface 1010), Xe lamp (CEL-HXF 300), gas chromatography (GC-7920).
4：Equipment includes autoclave, TEM (Tecnai G2 F30 S-TWIN), XPS (ESCALAB250 Xi), BET (ASAP 2020 HD88), XRD (D8 Advance), PL spectrophotometer (F-4500), time-resolved spectroscopy (PLS20), FTIR (Tensor 27), UV-vis spectrophotometer (Cary-5000), electrochemical station (Interface 1010), Xe lamp (CEL-HXF 300), gas chromatography (GC-7920). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Synthesis involves mixing chemicals, pH adjustment, hydrothermal reaction at 180°C for 4h, washing, drying. Photocatalytic tests involve dispersing catalyst in TEOA solution, vacuum pumping, irradiation with visible light, and H2 analysis by GC.
5：Data Analysis Methods:
Data analyzed using TEM, XPS, BET, XRD, PL, electrochemical measurements, and GC. Statistical analysis for particle size and hydrogen evolution rates.
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Transmission Electron Microscope
Tecnai G2 F30 S-TWIN
FEI
Characterization of morphology and structure of samples
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X-ray Photoelectron Spectrometer
ESCALAB250 Xi
Thermo Scientific
Analysis of chemical composition and valence states
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Fluorescence Spectrophotometer
F-4500
Hitachi
Collection of photoluminescence spectra
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Time-Resolved Spectrometer
PLS20
Edinburgh Instruments
Measurement of fluorescence lifetime
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Fourier Transform Infrared Spectrometer
Tensor 27
Bruker
Obtaining FTIR spectra
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Brunauer-Emmett-Teller Surface Area Analyzer
ASAP 2020 HD88
Micromeritics
Measurement of specific surface area
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X-ray Diffractometer
D8 Advance
BRUKER-AXS
Obtaining XRD patterns for crystallographic phase analysis
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UV-vis-NIR Spectrophotometer
Cary-5000
Varian
Recording UV-vis diffuse reflectance spectra
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Electrochemical Workstation
Interface 1010
Gamry Instrument
Conducting electrochemical tests
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Xenon Lamp
CEL-HXF 300
CEAULIGHT
Providing visible light irradiation for photocatalytic experiments
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Gas Chromatography
GC-7920
CEAULIGHT
Analysis of hydrogen gas produced
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