研究目的
To enhance the photoelectrochemical stability and water splitting performances of BiVO4 through Fe doping and modification with MIL-53(Fe).
研究成果
Fe doping improves the stability and PEC performance of BiVO4 by enhancing crystalline structure and reducing defects. Modification with MIL-53(Fe) further boosts performance by facilitating charge separation. This approach offers a promising strategy for designing efficient photoelectrodes for water splitting.
研究不足
The study focuses on specific modifications (Fe doping and MIL-53(Fe) loading) and may not address all factors affecting PEC performance. Potential optimizations include exploring other dopants or co-catalysts and scaling up for practical applications.
1：Experimental Design and Method Selection:
The study involves doping BiVO4 with Fe ions to improve stability and using MIL-53(Fe) as a co-catalyst to enhance charge separation. Methods include drop-casting for electrode fabrication, hydrothermal synthesis for MIL-53(Fe), and spin coating for modification.
2：Sample Selection and Data Sources:
Samples include pristine BiVO4, Fe-doped BiVO4, and Fe-doped BiVO4 modified with MIL-53(Fe). Data are obtained from PEC measurements and material characterizations.
3：List of Experimental Equipment and Materials:
Equipment includes a CHI-660D potentiostat, FE-SEM (JSM-6701F), XRD (PANalytical X'Pert PRO), UV-Vis spectrometer (UV-2550), xenon arc lamp (HSX-F300), and radiometer (CEL-NP2000). Materials include Bi(NO3)3·5H2O, NH4VO3, Fe(NO3)3, ethylene glycol, PEG-600, FeCl3·6H2O, terephthalic acid, HF, DMF, methanol, ethanol, Na2SO4, FTO substrates, Pt counter electrode, and SCE reference electrode.
4：0). Materials include Bi(NO3)3·5H2O, NH4VO3, Fe(NO3)3, ethylene glycol, PEG-600, FeCl3·6H2O, terephthalic acid, HF, DMF, methanol, ethanol, Na2SO4, FTO substrates, Pt counter electrode, and SCE reference electrode. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Fabricate Fe-doped BiVO4 by drop-casting precursor solution on FTO, drying at 150°C, and annealing at 500°C. Synthesize MIL-53(Fe) hydrothermally at 150°C, wash with methanol and water, and load onto electrodes via spin coating. Perform PEC measurements in a 3-arm cell with simulated solar light, record photocurrent and EIS. Characterize morphology with SEM, structure with XRD, and optical properties with UV-Vis.
5：Data Analysis Methods:
Analyze photocurrent density from amperometric i-t curves and linear sweep voltammograms, assess stability over time, and evaluate charge transfer resistance from EIS Nyquist plots.
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potentiostat
CHI-660D
CH Instruments
Used to record photocurrent response in photoelectrochemical measurements.
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field emission scanning electron microscope
JSM-6701F
JEOL
Used to characterize the morphology and size of the as-prepared products.
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X-ray diffractometer
X'Pert PRO
PANalytical
Used for X-ray diffraction measurements to analyze crystal structure.
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UV-Vis spectrometer
UV-2550
Shimadzu
Used to take UV-Vis diffuse reflectance spectra in the spectral range of 250–800 nm.
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xenon arc lamp
HSX-F300
Beijing NBeT Technology Co., Ltd
Served as the light source for simulated solar light irradiation in PEC experiments.
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radiometer
CEL-NP2000
Beijing Au-light Co., Ltd
Used to measure the light intensity from the xenon arc lamp.
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