研究目的
Investigating the influence of the synthesis method and the 'A' site substitution on the physicochemical and photoelectrochemical properties of BiFeO3 and LaFeO3 perovskites for solar water splitting applications.
研究成果
The study concludes that the 'A' site in ABO3 perovskites significantly influences their physicochemical and photoelectrochemical properties. LaFeO3 synthesized via the MW method showed superior charge separation and photocatalytic activity due to Jahn-Teller distortion, while BiFeO3 exhibited higher oxygen adsorption/desorption ability. The presence of impurities in sol-gel synthesized BiFeO3 unexpectedly enhanced its photocatalytic activity. The findings highlight the importance of synthesis method and 'A' site substitution in designing efficient perovskite photocatalysts for solar water splitting.
研究不足
The study acknowledges the intrinsic nature of high-temperature calcination/crystallization in traditional synthesis methods leading to secondary phases and low specific surface area. The MW method, while efficient, may still require optimization to fully eliminate impurities and enhance photocatalytic activity.
1：Experimental Design and Method Selection:
The study employed microwave-assisted (MW) and sol-gel (SG) methods for the synthesis of BiFeO3 and LaFeO3 perovskites. The rationale behind selecting these methods was to compare their effects on the crystal structure, optical, and electronic properties of the perovskites.
2：Sample Selection and Data Sources:
Starting materials included Bi(NO3)3·5H2O, Fe(NO3)3·6H2O, and ethylene glycol for the MW method, and similar precursors for the SG method. The samples were characterized using XRD, XPS, TEM, UV-DRS, IPCE, LSV, and impedance spectroscopy.
3：List of Experimental Equipment and Materials:
Equipment used included a microwave appliance (650 W), spin coating machine (SPS Spin 150, Netherlands), PANalytical X’pert pro for XRD, Shimadzu UV-3600 spectrophotometer for UV-DRS, Thermo-Scientific TPDRO 1100 for TPR, FEI Tecnai G2 for HR-TEM, and Thermo-Scientific K-Alpha X-Ray Photoelectron Spectrometer for XPS.
4：Experimental Procedures and Operational Workflow:
The synthesis involved mixing precursors, microwave irradiation or sol-gel processing, spin coating on FTO glass, calcination, and characterization.
5：Data Analysis Methods:
Data analysis included Scherer equation for particle size calculation, Tauc plot for bandgap energy, and equivalent circuit modeling for impedance spectroscopy.
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