研究目的
To enhance the photoelectrochemical performance of BiVO4 thin films by modifying them with a NiMoO4 thin layer for applications in water splitting.
研究成果
The NiMoO4 modification significantly enhances the PEC performance of BiVO4 thin films, increasing ABPE by 63% due to improved charge transfer and formation of a p-n junction. The mechanism involves reduced interface resistance and enhanced band bending, as confirmed by EIS and M-S analyses. This approach offers a promising strategy for improving BiVO4-based photoanodes in solar water splitting applications.
研究不足
The NiMoO4 loading amount is low, as indicated by no XRD peaks from NiMoO4, and overshoots in transient LSV plots suggest persistent surface recombination issues. The study is limited to lab-scale experiments and specific material combinations.
1：Experimental Design and Method Selection:
The study involved depositing porous BiVO4 thin films on FTO substrates using a metal organic deposition (MOD) method, followed by modification with NiMoO4 via hydrothermal treatment to form a p-n heterojunction. PEC properties were analyzed using electrochemical techniques.
2：Sample Selection and Data Sources:
BiVO4 thin films were prepared on FTO glass substrates. Precursors included Bi(NO3)3·5H2O and VO(acac)2, with NiMoO4 modification using Ni(NO3)3·6H2O and Na2MoO4·2H2O.
3：2O. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: SEM (S-4800, Hitachi), XRD (D8 Advance, Bruker), XPS (Thermo ESCALAB 250Xi), diffusion absorption spectrometer (Varian Cary 300), fluorescence spectrometer (Varian Cary 3000), electrochemical workstation (Chi660D, Chenhua), three-electrode quartz cell, Pt mesh counter electrode, saturated calomel reference electrode, 500 W Xe lamp (Beijing Trusttech) with UV filter, monochromator (Newport Cornerstone 260), power meter (Newport 2936C). Materials: Bi(NO3)3·5H2O (Sigma Aldrich, 98%), acetic acid (Sigma Aldrich, 99%), VO(acac)2 (Sinopharm, 97%), methanol (Aldrich, 99%), Ni(NO3)3·6H2O (Sigma Aldrich, 98%), Na2MoO4·2H2O (Sigma Aldrich, 98%), water, ethanol, FTO glass.
4：Experimental Procedures and Operational Workflow:
BiVO4 films were spin-coated and annealed; NiMoO4 modification involved hydrothermal treatment at 90°C for 60 min, followed by annealing. Characterization included SEM, XRD, XPS, UV-Vis, PL, and PEC measurements (LSV, IPCE, EIS, M-S plots) in 0.1 M Na2SO4/Na2SO3 electrolyte under visible light.
5：1 M Na2SO4/Na2SO3 electrolyte under visible light. Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using electrochemical impedance spectroscopy, fitting of Nyquist and M-S plots, calculation of ABPE and IPCE using specified formulas, and bandgap determination from absorption spectra.
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SEM
S-4800
Hitachi
Characterization of morphology and phase structure of samples
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XRD
D8 Advance
Bruker
Characterization of phase structure of samples
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XPS
Thermo ESCALAB 250Xi
Thermo
Investigation of chemical valence state of samples
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Diffusion Absorption Spectrometer
Varian Cary 300
Varian
Measurement of optical absorption spectra
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Fluorescence Spectrometer
Varian Cary 3000
Varian
Characterization of photoluminescence spectra under 400 nm excitation
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Electrochemical Workstation
Chi660D
Chenhua
Performance of all PEC measurements
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Xe Lamp
500 W
Beijing Trusttech
Provision of visible light irradiation for PEC measurements
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Monochromator
Newport Cornerstone 260
Newport
Used in IPCE measurements for wavelength selection
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Power Meter
Newport 2936C
Newport
Used in IPCE measurements for power intensity measurement
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