研究目的
To fabricate a novel 3D Fe2O3 nanorods/TiO2 nanosheets heterostructure to enhance visible-light photocatalytic and photoelectrochemical performances by improving surface area, optical absorption, and electron-hole separation.
研究成果
The 3D Fe2O3/TiO2 heterostructure significantly enhances photocatalytic and PEC performances due to increased surface area, better visible-light absorption, and efficient charge separation. Sample T3 shows the best results, with 89.3% MB degradation and high photocurrent density, demonstrating the effectiveness of the fabricated heterostructure for optoelectronic applications.
研究不足
The study is limited to specific synthesis conditions (e.g., CBD time not exceeding 100 min to avoid reduced performance due to dense structures), and the heterostructure may have constraints in scalability or application under varying environmental conditions.
1：Experimental Design and Method Selection:
The study uses hydrothermal and chemical bath deposition (CBD) methods to synthesize the heterostructure, with TiO2 nanosheets as a template. The growth is regulated by controlling CBD time and iron nitrate concentration.
2：Sample Selection and Data Sources:
Pure TiO2 nanosheets are prepared on FTO substrate, and Fe2O3 is deposited with varying concentrations (0.03 to 0.07 M) and times (25 to 125 min). Samples are denoted T0 to T
3：03 to 07 M) and times (25 to 125 min). Samples are denoted T0 to TList of Experimental Equipment and Materials:
5. 3. List of Experimental Equipment and Materials: Equipment includes XRD (Bruker AXS D8 Advance), SEM (JEOL JSM-6700F), TEM/HRTEM (JEOL JEM-2200FS), XPS (ESCALAB220i-XL), BET surface area analyzer (Micromeritics ASAP 2020), UV-vis spectrophotometer (Shimadzu UV-3600), electrochemical workstation (CHI660E), and simulated sunlight source (BOS-X-1000G). Materials include ammonium fluorotitanate, tetrabutyl titanate, iron nitrate, ethanol, methylene blue, and electrolytes like Na2S and Na2SO
4：Experimental Procedures and Operational Workflow:
TiO2 nanosheets are synthesized hydrothermally, then Fe2O3 is deposited via CBD at 90°C, followed by annealing at 550°C. Photocatalytic tests use a Xe lamp for MB degradation, and PEC tests use a three-electrode system under simulated sunlight.
5：Data Analysis Methods:
Data are analyzed using XRD for phase identification, SEM/TEM for morphology, XPS for composition, BET for surface area, UV-vis for optical properties, and electrochemical measurements for PEC performance.
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Scanning electron microscopy
JSM-6700F
JEOL
Characterization of microstructures
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Transmission electron microscopy
JEM-2200FS
JEOL
Characterization of microstructures and high-resolution imaging
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UV–vis spectrophotometer
UV-3600
Shimadzu
Examination of optical properties
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X-ray power diffraction
D8 Advance
Bruker AXS
Phase characterization of samples
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X-ray photoelectron spectra
ESCALAB220i-XL
Examination of chemical composition and elemental chemical status
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Brunauer-Emmett-Teller surface area analyzer
ASAP 2020
Micromeritics
Measurement of BET surface areas by N2 adsorption-desorption isotherms
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Electrochemical workstation
CHI660E
Measurement of PEC performances
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Simulated sunlight source
BOS-X-1000G
Providing AM 1.5 simulated sunlight for PEC tests
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Xe lamp
500 W
Used as light source for photocatalytic activity tests
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