研究目的
Investigating the enhancement of photocatalytic hydrogen evolution through the design of Au decorated hollow flower-like ZnO@ZnS heterostructures.
研究成果
The Au decorated hollow flower-like ZnO@ZnS heterostructure significantly enhances photocatalytic hydrogen evolution due to the synergistic effects of the hollow channel structure and deposited Au NPs. The hollow channel reduces charge carrier migration distance and resistance, while Au NPs facilitate directional charge migration and form a Z-scheme transfer mechanism, improving charge separation and migration.
研究不足
The study focuses on the photocatalytic hydrogen evolution under specific conditions and does not explore the scalability of the synthesis process or the long-term stability under industrial conditions.
1:Experimental Design and Method Selection:
The study involved the synthesis of Au decorated hollow flower-like ZnO@ZnS heterostructures through in-situ sulfidation, etching, and chemical deposition methods.
2:Sample Selection and Data Sources:
ZnO and ZnS were used as base materials, with Au nanoparticles deposited to form the heterostructure.
3:List of Experimental Equipment and Materials:
Instruments included XRD, SEM, TEM, UV-Vis DRS, XPS, PL spectrometer, and electrochemical workstation. Materials included Zn(NO3)2·6H2O, HMTA, thiourea, HAuCl4·4H2O, etc.
4:Experimental Procedures and Operational Workflow:
The synthesis involved sulfidation of ZnO to form ZnO@ZnS, etching to create hollow structures, and Au deposition. Photocatalytic hydrogen evolution was measured under xenon lamp irradiation.
5:Data Analysis Methods:
Data were analyzed using UV-vis absorption spectra, PL spectra, photocurrent-time curves, and EIS measurements.
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Fluorescence spectrometer
Edinburgh Instruments FLS 980
Edinburgh Instruments
Measuring PL spectra of the samples
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Field emission scanning electron microscope
Quanta 250 FEG
FEI
Taking SEM images of the samples
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Transmission electron microscope
JEOL JEM-2100F
JEOL
Taking TEM images of the samples
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UV-vis-NIR spectrometer
JASCO, V-670
JASCO
Recording UV-Vis DRS of the samples
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X-ray Photoelectron Spectrometer
ESCALAB Xi+
Thermo Scientific
Performing XPS analyses of the samples
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X-ray diffraction system
Philips X’pert Multipurpose
Philips
Recording XRD patterns of the samples
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Electrochemical workstation
CHI 660 E
Shanghai Chenhua
Recording electrochemical analyses
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Gas chromatograph
GC-9720
Determining the amount of H2 evolved under irradiation
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