研究目的
To reduce surface recombination during light-driven water oxidation by constructing a core-shell BiVO4@Ni:FeOOH photoanode and investigate its charge carrier dynamics.
研究成果
The core-shell BiVO4@Ni:FeOOH photoanode significantly enhances photocurrent density and reduces onset potential due to the formation of a p-n heterojunction, which inhibits surface recombination rather than improving surface catalysis. This approach is promising for efficient PEC water splitting and can be applied to other photoelectrodes with surface defects.
研究不足
The study may be limited by the complexity and instability of nanostructures, potential light blocking by excessive Ni:FeOOH coating, and the need for further understanding of interfacial processes. Optimization of coating thickness and scalability for practical applications could be areas for improvement.
1：Experimental Design and Method Selection:
The study involves synthesizing nanoporous BiVO4 via electro-deposition and thermal treatment, followed by coating with Ni:FeOOH using cyclic voltammetry to form a core-shell structure. Techniques include SEM, TEM, XRD, XPS, UV-visible spectroscopy, PL spectroscopy, and various PEC measurements.
2：Sample Selection and Data Sources:
Samples include pristine BiVO4 and BiVO4@Ni:FeOOH with different Ni:FeOOH coating cycles (BNF-1, BNF-5, BNF-10, BNF-15). Data are collected from laboratory experiments using synthesized materials.
3：5). Data are collected from laboratory experiments using synthesized materials. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes SEM (FEI Quanta FEG250), TEM (FEI Tecnai G2 20 200 kV), XRD (Bruker D8 ADVANCE), XPS (Thermo Scientific K-Alpha), UV-visible spectrophotometer (Hitachi UV-4100), PL spectrophotometer (Hitachi F-4600), electrochemical analyzer (CHI 760E), light source (500 W xenon lamp with AM 1.5G filter), gas chromatography (GC-7920N), and Zahner electrochemical workstation for IMPS. Materials include BiOI, FeCl3, NiCl2, KCl, NaF, H2O2, Na2SO4, Na2SO3, and FTO substrates.
4：5G filter), gas chromatography (GC-7920N), and Zahner electrochemical workstation for IMPS. Materials include BiOI, FeCl3, NiCl2, KCl, NaF, H2O2, Na2SO4, Na2SO3, and FTO substrates. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: BiVO4 is synthesized by electro-depositing BiOI and converting it to BiVO4 via thermal treatment. Ni:FeOOH is coated using CV scans in a specific electrolyte. Characterization involves morphological, structural, and compositional analysis. PEC measurements are performed in a three-electrode system with LSV, IPCE, EIS, IMPS, and gas evolution tests under illumination.
5：Data Analysis Methods:
Data are analyzed using equations for IPCE, LHE, charge separation efficiency, charge transfer efficiency, electron lifetime, and rate constants from IMPS. Statistical analysis includes comparing photocurrent densities, onset potentials, and efficiencies.
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SEM
Quanta FEG250
FEI
Morphology determination of samples
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TEM
Tecnai G2 20
FEI
Transmission electron microscopy for detailed imaging
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XRD
D8 ADVANCE
Bruker
Crystalline structure identification
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XPS
K-Alpha
Thermo Scientific
Elemental composition analysis
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UV-visible spectrophotometer
UV-4100
Hitachi
UV-visible spectroscopy recording
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Fluorescence spectrophotometer
F-4600
Hitachi
Photoluminescence spectrum recording
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Electrochemical analyzer
CHI 760E
Shanghai Chenhua
Photoelectrochemical measurements
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Xenon lamp
CEL-500
CEAULIGHT
Light source for illumination
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Light power meter
CEL-NP2000-2
Calibration of light intensity
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Gas chromatography
GC-7920N
Measurement of evolved gases
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Electrochemical workstation
Zahner
Intensity modulated photocurrent spectroscopy measurements
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LED
Providing intensity modulation light for IMPS
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