研究目的
To synthesize biomimetic indium sulfide using Mimosa pudica leaves as a template and evaluate its photocatalytic activity for hydrogen production.
研究成果
The biomimetic indium sulfide synthesized with Mimosa pudica template showed a threefold increase in photocatalytic hydrogen production compared to the control, attributed to morphological changes and surface species that enhance light absorption and charge separation. This approach offers a novel way to develop efficient photocatalysts inspired by nature.
研究不足
The study uses UV light (254 nm) for photocatalytic evaluation, which may not fully represent solar light conditions. The presence of organic residues from the template could affect long-term stability and performance. The method is specific to indium sulfide and may not be directly applicable to other materials.
1：Experimental Design and Method Selection:
A template-assisted hydrothermal method was used to synthesize biomimetic indium sulfide with Mimosa pudica leaves as the template. The synthesis involved varying the weight ratio of indium acetate to Mimosa pudica (2:1, 1:1, 1:2) and a control without template. The samples were calcined under nitrogen atmosphere.
2：Sample Selection and Data Sources:
Mimosa pudica leaves were collected, washed, dried, and pulverized. Indium acetate, sulfuric acid, citric acid, and thioacetamide were used as precursors.
3：List of Experimental Equipment and Materials:
Autoclave with Teflon liner, vacuum filter, calcination furnace, X-ray diffractometer (D8 Advance), scanning electron microscope (JEOL JSM-6490-LV) with EDS, STEM (FEI Titan G2 ChemiSTEM), BET surface area analyzer, UV-Vis spectrometer (Cary 5000), potentiostat-galvanostat (AUTOLAB PGSTAT 302 N), XPS with synchrotron radiation at I311 beamline, gas chromatograph (TRACE GC ULTRA) with TCD.
4：Experimental Procedures and Operational Workflow:
Hydrothermal synthesis at 150°C for 24 h, calcination at 400°C for 2 h under nitrogen. Characterization included XRD, SEM, STEM, BET, UV-Vis, photoelectrochemical measurements, XPS, and photocatalytic hydrogen evaluation under UV light.
5：Data Analysis Methods:
XRD for crystal structure, SEM and STEM for morphology, BET for surface area, Tauc plot for band gap, XPS for surface composition, and gas chromatography for hydrogen quantification.
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D8 Advance diffractometer
D8 Advance
Bruker
X-ray powder diffraction for crystal structure determination
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JEOL JSM-6490-LV microscope
JSM-6490-LV
JEOL
Scanning electron microscopy for morphology observation
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FEI Titan G2 ChemiSTEM
Titan G2 ChemiSTEM
FEI
Scanning transmission electron microscopy and elemental mapping
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Cary 5000 UV-Vis-NIR spectrometer
Cary 5000
Agilent
Recording steady-state UV-Vis absorption spectra
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AUTOLAB PGSTAT 302 N potentiostat-galvanostat
PGSTAT 302 N
Metrohm
Photoelectrochemical measurements
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TRACE GC ULTRA chromatograph
TRACE GC ULTRA
Thermo Scientific
Monitoring hydrogen production with thermal conductivity detector
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UV pen-ray lamp
Providing 254 nm UV radiation for photocatalytic evaluation
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