研究目的
To investigate the photo-induced phase transition (PIPT) of CdZnS based nanocomposites at room temperature under solar light illumination and its effect on photocatalytic hydrogen evolution.
研究成果
The photo-induced phase transition from cubic to hexagonal structure in RGO-CdZnS-5%Pt nanocomposites at room temperature under solar light enhances photocatalytic hydrogen evolution by reducing band gap, decreasing crystallite size, and improving charge carrier separation and diffusion, leading to higher efficiency and stability.
研究不足
The study is limited to CdZnS-based nanocomposites and may not generalize to other materials. The PIPT process requires specific solar light conditions and may depend on the synthesis method. Long-term stability beyond 5 days was not tested, and the mechanism of hole-induced phase transition could benefit from further mechanistic studies.
1：Experimental Design and Method Selection:
The study involved synthesizing RGO-CdZnS-5%Pt nanocomposites using a solvothermal process with dimethyl sulfoxide (DMSO) as the sulfur source, followed by photodeposition of Pt nanoparticles. The photocatalytic hydrogen evolution reaction (PCHER) was conducted under solar light illumination to induce phase transition.
2：Sample Selection and Data Sources:
Samples were RGO-Cd(1-x)ZnxS-5%Pt nanocomposites, with optimization of parameters such as composition, concentration, pH, and mass. Data were collected from UV-Vis diffuse reflectance spectra, XRD, and Raman spectroscopy before and after PCHER.
3：List of Experimental Equipment and Materials:
Equipment included solvothermal synthesis setup, photodeposition apparatus, solar light simulator (1 sun), UV-Vis spectrophotometer, X-ray diffractometer, Raman spectrometer, and gas chromatography for hydrogen measurement. Materials included reduced graphene oxide (RGO), cadmium and zinc precursors, DMSO, platinum salt, and sacrificial agents.
4：Experimental Procedures and Operational Workflow:
Synthesis involved solvothermal decomposition of DMSO to form RGO-CdZnS, followed by Pt photodeposition. PCHER was performed in an aqueous solution with sacrificial agents under solar light, with hydrogen evolution monitored over time. Characterization was done before and after reaction.
5：Data Analysis Methods:
Band gaps were calculated from UV-Vis spectra using Kubelka-Munk function, crystallite sizes from XRD using Debye-Scherrer equation, and structural changes analyzed via Raman spectra and XRD peak positions.
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