研究目的
To investigate the effects of annealing conditions on the oxygen evolution activity of a BaTaO2N photocatalyst loaded with cobalt species.
研究成果
Annealing under N2 flow at 1173 K and subsequent H2 treatment significantly enhance the O2 evolution activity of CoOx/BaTaO2N by improving cocatalyst-photocatalyst contact and exposing the photocatalyst surface, achieving an AQE of 0.55% at 420 nm. This highlights the importance of interface engineering for efficient photocatalytic water oxidation.
研究不足
The study is limited to particulate photocatalysts and specific annealing conditions; it may not generalize to other materials or methods. The stability and long-term performance under practical conditions were not fully explored.
1：Experimental Design and Method Selection:
The study used an impregnation method to load CoOx cocatalyst on BaTaO2N, followed by annealing under various atmospheres (N2, NH3, H2, air) and temperatures to optimize photocatalytic activity for water oxidation under visible light irradiation.
2：Sample Selection and Data Sources:
BaTaO2N was synthesized using a flux method with BaCO3, Ta2O5, and KCl, nitrided under NH3 flow. Co(NO3)2·6H2O was used for CoOx loading.
3：List of Experimental Equipment and Materials:
Equipment includes Xe lamp, gas chromatograph, XRD, UV-vis DRS, FE-SEM, FE-TEM. Materials include BaTaO2N, Co(NO3)2·6H2O, AgNO3, La2O3, various gases (N2, NH3, H2, Ar).
4：Experimental Procedures and Operational Workflow:
BaTaO2N powder was impregnated with Co solution, evaporated, and annealed under specified conditions. Photocatalytic reactions were conducted in a Pyrex vessel with AgNO3 solution under visible light, with gas analysis.
5：Data Analysis Methods:
Oxygen evolution rates were measured using gas chromatography. Apparent quantum efficiency was calculated based on photon rate and oxygen evolution. Characterization involved XRD, DRS, SEM, TEM for structural and morphological analysis.
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Gas chromatograph
GC-8A
Shimadzu
Analysis of evolved gases (e.g., O2) during photocatalytic reactions.
GC-8A Series Gas Chromatograph
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X-ray diffractometer
RINT-Ultima III
Rigaku
Characterization of crystal structure and phases of materials.
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UV-vis diffuse reflectance spectrometer
V-670DS
JASCO
Measurement of optical absorption properties of photocatalysts.
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Field emission scanning electron microscope
S-4700
Hitachi
Imaging of surface morphology and particle size.
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Field emission transmission electron microscope
JEM-2800
JEOL
High-resolution imaging and analysis of material structure and cocatalyst dispersion.
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Cutoff filter
L42
Hoya
Filtering light to specific wavelength ranges for irradiation.
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Xe lamp
300 W
Light source for photocatalytic reactions under visible light irradiation.
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Spectroradiometer
LS-100
EKO Instruments
Measurement of photon flux and light intensity for quantum efficiency calculations.
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Cold mirror
CM-1
Reflecting visible light while transmitting infrared, used in light setup.
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Bandpass filter
BP420
Providing monochromatic light at 420 nm for quantum efficiency measurements.
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