研究目的
Investigating the fabrication and optimization of CdS/TiO2 nanofibers structures for enhanced photoelectrochemical water splitting efficiency for hydrogen generation.
研究成果
The CdS/TiO2 NFs structure with a CdS dipping time of 2 hours exhibited the highest photoconversion efficiency of 3.2% at 0.00 V (vs. Ag/AgCl), demonstrating significant potential for application in energy-to-hydrogen conversion devices.
研究不足
The study is limited by the potential recombination of photogenerated carriers with increasing CdS layer thickness, which may decrease photoconversion efficiency despite higher electron-hole pair generation.
1：Experimental Design and Method Selection:
The study involved the synthesis of TiO2 nanofibers on ITO substrates via electrospinning using Titanium tetraisopropoxide as the precursor, followed by calcination. CdS was then deposited on TiO2 NFs using dip coating with varying dipping times to optimize water splitting efficiency.
2：Sample Selection and Data Sources:
The samples were characterized using SEM, XRD, TEM, Raman spectroscopy, and XPS to analyze their morphologies and crystalline structures.
3：List of Experimental Equipment and Materials:
Equipment included a potentiostat for PEC measurements, a 150 W xenon lamp for simulated sunlight, and various chemicals for synthesis and electrolyte preparation.
4：Experimental Procedures and Operational Workflow:
The PEC properties were measured in specific electrolyte solutions under simulated sunlight, with photocurrent density and photoconversion efficiency as key metrics.
5：Data Analysis Methods:
The band gap was determined using the Kubelka-Munk method, and photoconversion efficiency was calculated based on photocurrent density and incident light intensity.
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FE-SEM
Hitachi S4800
Hitachi
Used for morphological characterization of the fabricated samples.
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HRTEM
JEOL JEM-2100F
JEOL
Used for high-resolution transmission electron microscopy analysis of the samples.
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XRD
Siemen D5005
Siemens
Used for X-ray diffraction analysis to determine the crystalline structure of the samples.
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Raman spectrometer
RFS 100 FT-Raman Bruker spectrometer
Bruker
Used for Raman spectroscopy analysis of the samples.
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poly(vinylpyrrolidone)
wt 360,000
Sigma-Aldrich Co., Ltd
Used in the electrospinning process as part of the precursor solution for TiO2 nanofibers synthesis.
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ethanol
≥ 99.8%
Solvent used in the preparation of the electrospinning solution.
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acetic acid
≥ 99%
Used in the preparation of the electrospinning solution.
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titanium tetraisopropoxide
97%
Sigma-Aldrich Co., Ltd
Precursor for the synthesis of TiO2 nanofibers.
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cadmium nitrate tetrahydrate
98%
Aldrich Chemical Company, Inc
Source of Cd2+ for CdS deposition on TiO2 nanofibers.
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thioacetamide
98%
Alfa Aesar Co., Ltd
Source of S2? for CdS deposition on TiO2 nanofibers.
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sodium sulfide pentahydrate
98%
DaeJung Chemical and Metals Co., Ltd
Used in the electrolyte solution for PEC measurements of CdS/TiO2 photoanodes.
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sodium sulfite
≥ 98%
Sigma-Aldrich Co., Ltd
Used in the electrolyte solution for PEC measurements of CdS/TiO2 photoanodes.
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sodium sulfate
≥ 98%
Sigma-Aldrich Co., Ltd
Used in the electrolyte solution for PEC measurements of uncoated TiO2 photoanode.
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UV–vis spectrophotometer
Carry 3000
Used for optical characterization of the samples.
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XPS
GT-3000A
Used for elemental and chemical state analyses of the samples.
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Potentiostat/Galvanostat
DY2300
Used for photoelectrochemical measurements.
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Xenon lamp
Gloria-X150A
Used as a simulated sunlight source for PEC measurements.
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