研究目的
To improve the photoelectric property of nanosized BiOBr by promoting the photogenerated charge transfer and separation through co-modification with SnO2 and Ag.
研究成果
The Ag-SnO2-BOB nanocomposites prepared via the one-pot hydrothermal method display superior photoelectric properties with high SPV response, attributed to the synergistic effect of SnO2 and Ag co-modification. This work shows an effective approach to improve the photoelectric properties of BOB by modulating the lifetime, thermodynamic energy of photoelectrons and promoting O2 adsorption, paving a new way to obtain high performance materials for photoelectric devices.
研究不足
The study focuses on the photoelectric properties of BiOBr nanoplates modified with SnO2 and Ag, and the mechanisms of charge transfer and separation. Potential limitations include the scalability of the synthesis method and the stability of the nanocomposites under various environmental conditions.
1：Experimental Design and Method Selection:
A simple one-pot hydrothermal method was used to prepare SnO2 and Ag co-modified BiOBr nanocomposites (Ag-SO-BOB).
2：Sample Selection and Data Sources:
BiOBr nanoplates were synthesized via a one-step hydrothermal method.
3：List of Experimental Equipment and Materials:
X-ray powder diffraction (XRD) diffractometer, scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis spectrophotometer, X-ray photoelectron spectroscopy (XPS), photochemical cell measurements, spectrofluorometer, surface photovoltage spectroscope, transient-state surface photovoltage (TS-SPV) measurements, temperature-programmed desorption (TPD) for desorption O
4：Experimental Procedures and Operational Workflow:
Synthesis of BiOBr nanoplate, SnO2/BiOBr nanocomposites, and Ag-SnO2-BiOBr nanocomposites followed by characterization and photoelectric property measurements.
5：Data Analysis Methods:
Analysis of crystal structure, size and morphology, optical properties, photoelectric properties, and charge separation mechanisms.
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Spectrofluorometer
Perkin-Elmer LS 55
Perkin-Elmer
Measuring the fluorescence of 7-hydroxycoumarin
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Digital phosphor oscilloscope
DPO 4104B
Tektronix
Collecting the photovoltage signals generated by the sample
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X-ray powder diffraction (XRD) diffractometer
Bruker D8 Advance
Bruker
Analyzing the crystal structure of the samples
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Scanning electron microscopy (SEM)
Hitachi, S-4800
Hitachi
Investigating the size and morphology of the final products
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Transmission electron microscopy (TEM)
JEOL, JEM-2100
JEOL
Investigating the size and morphology of the final products
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UV-vis spectrophotometer
Shimadzu UV-2550
Shimadzu
Determining UV-vis absorption spectra
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X-ray photoelectron spectroscopy (XPS)
Kratos-AXIS ULTRA DLD
Kratos
Testing XPS spectra
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Surface photovoltage spectroscope
Home-built
Measuring the surface photovoltage (SPV) responses of different samples
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Pulsed laser
Lab-130-10H
Newport
Exciting the samples for transient-state surface photovoltage (TS-SPV) measurements
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Chemisorption Analyzer
tp 5080 Chemisorb
Performing temperature-programmed desorption (TPD) for desorption O2
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Gas chromatograph
GC-7920
AuLight
Measuring the CO oxidation experiment results
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