研究目的
To investigate the effect of K and I co-doping on the photoelectrochemical properties and semiconductor type transformation of g-C3N4.
研究成果
The K&I co-doping transforms g-C3N4 from amphoteric to n-type semiconductor by pulling the Fermi level toward its conduction band minimum. This doping also enhances the photoelectrochemical performance through improved electrical conductivity and charge carrier separation efficiency.
研究不足
The stability of K&I-C3N4 is not as good as that of g-C3N4, attributed to photocorrosion. The study focuses on the transformation of semiconductor type and does not extensively explore the long-term stability under operational conditions.
1：Experimental Design and Method Selection:
The K&I co-doped g-C3N4 was prepared by sintering the mixture of dicyandiamine, KI and I2. The band structure and photoelectrochemical properties were analyzed.
2：The band structure and photoelectrochemical properties were analyzed. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The samples were prepared from dicyandiamine, KI, and I2, and characterized using various techniques.
3：List of Experimental Equipment and Materials:
XRD, SEM, TEM, EDS, XPS, UV/Vis diffuse reflectance spectrophotometer, PL spectrometer, FTIR spectrometer, solid-state NMR spectrometer.
4：Experimental Procedures and Operational Workflow:
The mixture was sintered, characterized, and its photoelectrochemical properties were measured.
5：Data Analysis Methods:
The data were analyzed to understand the band structure adjustment and photoelectrochemical performance enhancement.
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X-ray diffraction
D/MAX-2500/PC
Rigaku Co.
Identifying the crystalline structures of the prepared materials.
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Scanning electron microscope
Ultra 55
Zeiss
Analyzing the morphologies of the prepared samples.
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Field emission high-resolution transmission electron microscope
Tecnai G2 F20
FEI Company
Analyzing the morphologies of the prepared samples.
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Energy dispersive spectrometer
X-max
Oxford Instrument
Analyzing the elemental compositions and the bonding information of the prepared samples.
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X-ray photoelectron spectroscopy
Axis Ultra
Kratos Analytical Ltd.
Analyzing the elemental compositions and the bonding information of the prepared samples.
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UV/Vis diffuse reflectance spectrophotometer
U-41000
HITACHI
Investigating the optical absorption properties of the prepared samples.
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Fluorescence spectrometer
Fluoro Max-4
HORIBA Jobin Yvon
Characterizing the photoluminescence intensity of the prepared samples.
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Fourier transform infrared spectrophotometer
Nicolet IS10
Recording FTIR spectra over the range 4000-500 cm-1.
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Solid-state NMR spectrometer
600MHz DD2
Recording solid-state 13C nuclear magnetic resonance spectra.
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