研究目的
To fabricate an n-n heterojunction photoanode of V2O5/BiVO4 via a facile electrodeposition synthesis method to overcome technical bottlenecks in conventional singular photoanode structures for photoelectrochemical water oxidation, and to study the synergistic effects of band potentials matching and conductivity difference.
研究成果
The V2O5/BiVO4 heterojunction photoanode demonstrated significantly improved photocurrent density due to enhanced charge separation and transfer, validated by experimental analyses and theoretical band diagram reconstruction, paving the way for efficient PEC water oxidation applications.
研究不足
The study may have limitations in scalability for practical applications, potential variability in electrodeposition conditions, and the need for further optimization of heterojunction interfaces to enhance stability and efficiency under long-term operation.
1：Experimental Design and Method Selection:
The study used a facile electrodeposition synthesis method to fabricate V2O5/BiVO4 heterojunction photoanodes on FTO substrates, with characterization techniques including LSV, IMPS, EIS, HR-TEM, XRD, XPS, Raman, and UV-vis spectroscopy to analyze band potentials and conductivity differences. Performance was evaluated using a standard three-electrode PEC cell under 1.5 AM solar simulator illumination.
2：5 AM solar simulator illumination. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Samples included pristine BiVO4, V2O5, and heterojunction structures (V2O5/BiVO4 and BiVO4/V2O5) fabricated on FTO glass substrates. Data were obtained from electrochemical measurements and spectroscopic analyses.
3：List of Experimental Equipment and Materials:
Equipment included a JEOL JEM-2100F electron microscope for TEM/HR-TEM, Agilent Cary 100 spectrophotometer for UV-vis, Horiba Scientific Raman spectrometer, Bruker D8 XRD, PHI Quantera II XPS microprobe, Metrohm PGSTAT 204 potentiostat/galvanostat for electrochemical analyses, and IVIUM technology potentiostat for IMPS. Materials included Bi(NO3)3·5H2O, CH3COONa, VOSO4, HNO3, C2H6O, H2SO4, Na2SO4, and FTO glass from specified suppliers.
4：Experimental Procedures and Operational Workflow:
FTO substrates were cleaned, and photoanodes were fabricated via electrodeposition at specific potentials and times, followed by annealing. Characterization involved TEM, XRD, Raman, XPS, and electrochemical measurements (LSV, EIS, IMPS) in Na2SO4 electrolyte with or without H2O2 hole scavenger, under light irradiation.
5：Data Analysis Methods:
Data were analyzed using equivalent circuit models for EIS, frequency analysis for IMPS to determine rate constants and transit times, and Mott-Schottky plots for flat-band potentials and band gap estimations via Tauc plots.
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Electron Microscope
JEM-2100F
JEOL
Used for obtaining TEM and HR-TEM images to analyze the microstructure and heterojunction formation of photoanodes.
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Spectrophotometer
Cary 100
Agilent
Used for recording UV-vis absorbance spectra to analyze light absorption properties of the materials.
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X-ray Diffractometer
D8
Bruker
Used for characterizing crystal structures via XRD analysis.
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Potentiostat/Galvanostat
PGSTAT 204
Metrohm
Used for conducting electrochemical measurements such as LSV, EIS, and other analyses in the PEC cell.
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Raman Spectrometer
Horiba Scientific
Used for recording Raman spectra to characterize the chemical structure and phases of the materials.
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XPS Microprobe
Quantera II
Ulvac-PHI
Used for XPS measurements to analyze surface chemical compositions and binding energies.
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Potentiostat
IVIUM technology
Used for IMPS measurements to analyze charge transfer and recombination kinetics.
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FTO Glass
Kaivo Optoelectronic Technology
Used as the transparent and conductive substrate for fabricating photoanodes.
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