研究目的
Investigating the fabrication of CdS-decorated mesoporous SiC hollow nanofibers for efficient visible-light-driven photocatalytic hydrogen production.
研究成果
The CdS/SiC hybrid photocatalysts exhibited a stable visible-light photocatalytic H2 evolution with a rate up to 124.65 μmol h?1 g?1, which is 16 times higher than that of pure SiC. The enhanced performance is attributed to the built-in electric field induced by the heterojunctions between CdS and SiC and the mesoporous 1D hollow architecture.
研究不足
The study focuses on the photocatalytic hydrogen production under visible light, and the stability and recyclability of the photocatalysts were tested over 18 reaction cycles. Potential areas for optimization include further enhancing the photocatalytic efficiency and exploring the scalability of the fabrication process.
1：Experimental Design and Method Selection:
The study involved the fabrication of mesoporous SiC hollow nanofibers by electrospinning, followed by hydrothermal treatment to decorate CdS nanoparticles on the SiC fibers.
2：Sample Selection and Data Sources:
The samples were prepared with different CdS contents (0, 4, 8, 12, 16 wt%) by tailoring the introduced concentrations of CdCl2·5/2H2O and Na2S·9H2O.
3：2O. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Polyureasilazane (PSN), Polyvinylpyrrolidone (PVP), Sodium sulfide (Na2S·9H2O), Cadmium chloride (CdCl2·5/2H2O), Sodium sulfite (Na2SO3), absolute ethyl alcohol, hydrofluoric acid (HF), and hydrochloric acid (HCl) were used.
4：Experimental Procedures and Operational Workflow:
The process included electrospinning, pyrolysis, air calcination, acid treatment, and hydrothermal decoration of CdS.
5：Data Analysis Methods:
The products were characterized by XRD, FESEM, HRTEM, and N2 adsorption. Photocatalytic activities were measured by monitoring hydrogen evolution under visible light irradiation.
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X-ray powder diffraction
D8 Advance
Bruker, Germany
Characterization of the crystal structure of the samples
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Field emission scanning electron microscopy
S-4800
Hitachi, Japan
Morphological characterization of the samples
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High-resolution transmission electron microscopy
JEM-2010F
JEOL, Japan
Structural and compositional analysis of the samples
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Polyureasilazane
PSN
Ceraset, Kion Corporation
Raw material for the fabrication of mesoporous SiC hollow nanofibers
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Polyvinylpyrrolidone
PVP, K60
Usolf, Shandong
Raw material for the fabrication of mesoporous SiC hollow nanofibers
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Sodium sulfide
Na2S·9H2O
Aladdin, Shanghai
Used in the hydrothermal decoration of CdS nanoparticles
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Cadmium chloride
CdCl2·5/2H2O
Macklin Shanghai
Used in the hydrothermal decoration of CdS nanoparticles
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Specific surface area and porosity analyzer
ASAP 2020HD88
Micromeritics, USA
Characterization of the porous properties of the samples
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