研究目的
To improve solar photoelectrochemical (PEC) water splitting efficiency by structuring an integrating photoanode with NiFe-LDH nanosheets decorated on doped BiVO4, addressing energy crisis and environmental pollution from fossil fuel combustion.
研究成果
The ternary integrating photoanode of Mo-doped BiVO4 with NiFe-LDH significantly enhances PEC water oxidation performance, with increased photocurrent density, cathodic shift in onset potential, higher IPCE, and improved stability. The enhancement is due to synergistic effects of doping and cocatalysis, increasing carrier density and charge separation. This work provides a promising method for efficient and low-cost photoanodes, suggesting future research on optimization and application scalability.
研究不足
The study is limited to laboratory-scale experiments with specific electrolyte conditions (0.1 M Na2SO4, pH 7). Potential optimizations include scaling up for practical applications, exploring other dopants or cocatalysts, and improving long-term stability beyond 8000 s. The excess deposition of NiFe-LDH can hinder performance, indicating a need for precise control.
1：Experimental Design and Method Selection:
The study uses a modified metal organic decomposition technique for fabricating BiVO4 and Mo-doped BiVO4 photoanodes, and electrodeposition for NiFe-LDH decoration. Theoretical models include Mott-Schottky analysis and equivalent circuit fitting for EIS.
2：Sample Selection and Data Sources:
Samples include pure BiVO4, Mo-doped BiVO4 (BiV
3：98Mo02O4, BiV97Mo03O4, BiV96Mo04O4), and NiFe-LDH decorated variants. Data from XRD, SEM, HRTEM, EDS, XPS, UV-vis, and PEC measurements. List of Experimental Equipment and Materials:
FTO glass, sodium sulfate, bismuth nitrate, vanadium acetylacetonate, dimethyl sulfoxide, nickel nitrate, ferrous sulfate, acetic acid. Equipment includes Shimadzu XRD-6000 diffractometer, SEM with EDS, JEOL JEM-2010 HRTEM, Thermo VG ESCALAB250 XPS, UV-vis spectrometer, CHI660A electrochemical workstation, 300 W Xe lamp.
4：Experimental Procedures and Operational Workflow:
Fabricate photoanodes by coating precursor solutions on FTO, calcining, electrodepositing NiFe-LDH at -
5：0 V vs. Ag/AgCl with varying charge amounts, characterize structure and morphology, perform PEC measurements in three-electrode system with 1 M Na2SO4 electrolyte under illumination, measure IPCE, EIS, Mott-Schottky, stability tests, and oxygen evolution. Data Analysis Methods:
Use ZView software for EIS fitting, equations for bandgap calculation, IPCE, carrier density, and faradaic efficiency. Statistical analysis of photocurrent densities and efficiencies.
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