研究目的
Investigating the construction of g-C3N4 quantum dots modified g-C3N4/GO nanosheet aerogel for UV-Vis-NIR driven highly efficient photocatalytic H2 production.
研究成果
The CNGO/CNQDs exhibited higher efficiency of photocatalytic H2 production and effectively utilized ultraviolet to near-infrared light in sunlight. The photocatalytic hydrogen production efficiency reached 1230.72 mmol h?1, which was about 16 times higher than that of CN-5. The AQY exceeded 13% at 420 nm and reached 0.116% at 700 nm.
研究不足
The stability of the CNGO/CNQDs photocatalyst is still a challenge, as the photocatalytic hydrogen production rate decreases rapidly after several cycles.
1：Experimental Design and Method Selection:
The study involved the preparation of a three-dimensional porous photocatalyst of graphitic carbon nitride quantum dot (CNQDs) modified g-C3N4/graphene oxide composite aerogel (CNGO/CNQDs) via hydrothermal and vacuum injection method.
2：Sample Selection and Data Sources:
The samples included CN-5, CNGO, and CNGO/CNQDs, with characterization techniques such as FT-IR, XRD, XPS, SEM, TEM, Raman spectroscopy, BET, UV-Vis DRS, PL spectra, and electrochemical measurements.
3：List of Experimental Equipment and Materials:
Sodium nitrate, anhydrous ethanol, hydrogen peroxide aqueous solution, concentrated sulfuric acid, hydrochloric acid, potassium permanganate, sodium chloride, ammonium chloride, melamine, natural graphite flake, and poly (3, 4-ethylenedioxythiophene)-poly (styrenesulfonate) were used.
4：Experimental Procedures and Operational Workflow:
The synthesis involved hydrothermal method for CNGO and vacuum injection for CNQDs loading, followed by freeze-drying. Photocatalytic tests for H2 production were executed in a top-irradiation-type photoreactor.
5：Data Analysis Methods:
The data were analyzed using various spectroscopic and microscopic techniques to evaluate the photocatalytic performance and material properties.
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Field emission scanning electron microscope
Quanta 400
FEI Company
Observing the morphology of the samples.
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Steady state transient fluorescence spectrometer
FLS 1000
Edinburgh
Monitoring transient PL lifetime and room temperature (298 K) and low temperature (77 K) with 375 nm laser as excitation light source.
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Spectrum One FT-IR spectrophotometer
Perkin-Elmer
Examining Fourier Transform Infra-Red (FT-IR) spectra at room temperature.
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X-ray diffraction measurements
X’Pert Pro
Philips
Determining the crystalline phases of the samples.
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X-ray photoelectron spectroscopy
Thermo ESCALAB250
Recording data with a monochromatized Al Ka line source (200 W).
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Transmission electron microscopy
JEM-2100UHRJEOL
Observing the morphology of the samples.
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Raman spectrometer
Thermo DXR2xi
Testing Raman spectroscopy with 532 nm Laser.
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Micromeritics instrument
JWGB 132F
Determining the specific surface area and the pore diameter by nitrogen adsorption at 77.15 K.
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UV-Vis diffuse reflectance spectroscopy
Shimadzu UV-2600
Performing measurements equipped with an integrating sphere attachment.
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Photoluminescence spectra
Shimadzu RF-6000
Monitoring at a spectrophotometer.
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Electrochemical Workstation
Zahner Zennium
Conducting electrochemical measurements.
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