研究目的
To improve the solar conversion efficiency by accelerating the photocarrier separation and transportation through materials design, specifically by developing a highly effective PHE catalyst based on in-plane benzene-ring doped g-C3N4 nanosheets heterostructure.
研究成果
The benzene-ring doped g-C3N4 nanosheets exhibited extended light adsorption and enhanced separation/transfer of photoinduced holes and electrons, leading to a 12-fold improvement in photocatalytic hydrogen evolution efficiency. This work provides a new strategy for designing highly active PHE catalysts.
研究不足
The doping amount of BPS, pyrolysis temperature, and time had effects on the catalytic performance, indicating the need for optimization to maximize the enhancement effect without destroying the basal structure of g-C3N4.
1：Experimental Design and Method Selection:
The study involved the thermal co-polymerization of urea and 4, 4'-sulfonyldiphenol (BPS) followed by a controlled heat-etching step to produce benzene-ring doped g-C3N4 nanosheets.
2：Sample Selection and Data Sources:
Urea and BPS were used as starting materials.
3：List of Experimental Equipment and Materials:
Equipment included a muffle furnace for thermal treatment, TEM, SEM, AFM, XPS, UV-vis spectrophotometer, and a photocatalytic analysis system.
4：Experimental Procedures and Operational Workflow:
The mixture of urea and BPS was heated to 550 oC, then subjected to heat etching at 500 oC. The photocatalytic activity was tested under visible light with Pt as a co-catalyst.
5：Data Analysis Methods:
The photocatalytic activity was analyzed by gas chromatography, and the electronic structure was studied using DFT calculations.
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Rigaku D/max-2500 diffractometer
D/max-2500
Rigaku
X-ray diffraction (XRD) patterns analysis
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HITACHI S-4800 SEM
S-4800
HITACHI
Morphology and microstructures characterization
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JEOL JEM-2100F
JEM-2100F
JEOL
High-resolution transmission electron microscopy (HRTEM)
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Nanosurf Flex-Axiom microscope
Flex-Axiom
Nanosurf
Atomic force microscope (AFM) images and height profiles acquisition
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Shimadzu UV-2550 spectrophotometer
UV-2550
Shimadzu
UV-visible absorption spectra acquisition
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Bruker Avance III 400WB solid-state NMR spectrometer
Avance III 400WB
Bruker
13C cross-polarization magic-angle spinning (CP–MAS) NMR spectra recording
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CHI760 electrochemical workstation
CHI760
CH Instruments, Inc.
Photoelectrochemical measurements
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urea
Beijing Chemical Reagent Company
Starting material for the synthesis of g-C3N4 nanosheets
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4, 4'-Sulfonyldiphenol
Alfa-Aesar
Doping agent for the synthesis of benzene-ring doped g-C3N4 nanosheets
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VG Scientific ESCALab220i-XL spectrometer
ESCALab220i-XL
VG Scientific
XPS measurement
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JW-BK132F high performance micropore analyzer
JW-BK132F
Specific surface area measurement by the BET method
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LabRAM HR Evolution Raman microscope
HR Evolution
LabRAM
Raman spectra collection
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FLS980 fluorescence spectrometers
FLS980
Static and time-resolved decay fluorescence spectra gathering
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PerfectLight Labsolar-III AI automatic online photocatalytic analysis system
Labsolar-III AI
PerfectLight
Photocatalytic water splitting reactions
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300 W Xe lamp
PLS-SXE 300
Beijing Trusttech Co. Ltd
Light source for photocatalytic reactions
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Fuli GC9790SD
GC9790SD
Fuli
Online gas chromatography for evolved H2 analysis
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