研究目的
To propose and construct a self-healing internal electric field for sustainably enhanced photocatalysis, addressing the saturation issues of static internal electric fields and providing experimental evidence on its role in charge separation.
研究成果
The self-healing internal electric field in piezoelectric-photocatalytic composite helical microfibers significantly enhances photocatalytic performance by sustainably promoting charge separation, overcoming saturation issues. This provides a new strategy for photocatalyst design with potential applications in energy and environmental solutions.
研究不足
The piezoelectric potential can be saturated by photogenerated carriers and external charges within about 10-16 minutes, limiting its sustained effect without renewal. The study is focused on specific materials (PVDF/g-C3N4) and may not generalize to other systems. Energy consumption for deformation in other contexts (e.g., ultrasonic) is not addressed.
1：Experimental Design and Method Selection:
The study designed a piezoelectric-photocatalytic composite helical microfiber system using microfluidics to create PVDF/g-C3N4 microfibers, inspired by bioinspired simple harmonic vibration. Theoretical models involve piezoelectric effect and charge separation mechanisms. Methods include synthesis, characterization, and photocatalytic activity evaluation.
2：Sample Selection and Data Sources:
Samples include g-C3N4 powder, PVDF, PVDF-CTFE, and their composites. g-C3N4 was synthesized from urea, and composites were prepared via microfluidics. Data sources are experimental measurements from instruments.
3：List of Experimental Equipment and Materials:
Equipment includes muffle furnace, microfluidic device, bidirectional push-pull sampling pump, ultraviolet lamp, transient photovoltage setup with pulse laser and oscilloscope, photoluminescence spectrophotometer. Materials include urea, PVDF powder, PVDF-CTFE, DMF, deionized water, RhB, MO.
4：Experimental Procedures and Operational Workflow:
Synthesis of g-C3N4 by heating urea; preparation of composite microfibers via microfluidics; photocatalytic degradation tests at various flow rates; transient photovoltage and PL measurements under deformation and light irradiation.
5：Data Analysis Methods:
Data analyzed using XRD, UV-vis, SEM, TEM for structure; photocatalytic efficiency calculated from degradation rates; transient photovoltage and PL spectra analyzed for charge behavior.
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