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Sustainable Organic Dyes from Winemaking Lees for Photoelectrochemical Dye-Sensitized Solar Cells
摘要： During the last two decades, Dye Sensitized Solar Cells (DSSCs) have received a great deal of attention as a promising, low-cost alternative to conventional silicon photovoltaic devices. Natural dye molecules can be used as a sensitizer for their low cost, good light absorbance, easy preparation process, and biodegradability. In this study, dyes were obtained from wine lees, the last by-product of winemaking process, supplied by a venetian winery (Italy). Polyphenols, like tannins and anthocyanins, which were extracted from winemaking lees, were adsorbed on a nanostructured ordered mesoporous titanium dioxide, previously treated at different temperatures (400–600 °C). Both dyes and titania semiconductor samples were studied with different techniques. The tests were carried out on prototypes to evaluate the cell power and the photocurrent generated under simulated solar light irradiation. The obtained solar energy conversion efficiencies are comparable to those that were reported in literature by using organic dyes extracted from vegetables, fruits, and plants. It is significant that these dyes are largely available and cost effective, since recovered from a waste otherwise to be disposed of, opening up a perspective of feasibility for inexpensive and environmentally friendly dye solar cells to generate green electricity and transforming agri-food waste into a resource.
关键词： circular economy,organic dyes,titania nanoparticles,winemaking lees,DSSCs
更新于2025-09-23 15:21:01
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Hollow Plasma-Sprayed Spherical Nanostructured Titania Feedstock for Photocatalytic Applications
摘要： There have been persistent challenges in thermal spraying of nanoparticles feedstock for making nanostructured coatings with desired mechanical strength. Here we report fabrication of nanostructured titania coatings by atmospheric plasma spraying of hollow titania spheres, and microstructures and photocatalytic activities of the coatings are examined. The hollow microspheres are * 50 lm in diameter and possess a mesoporous shell of 1-3 lm in thickness. The coatings show micro-nano hybrid structures with well-retained titania nanoparticles and agglomerated granules. High anatase content is achieved in the coatings, suggesting that constrained heating of the particles effectively prevents the transformation from anatase to rutile. The spherical characteristics of the organic materials in the feedstock powder play dominant roles in regulating the physicochemical characteristics of the coatings for photocatalytic performances. These results would provide insight into large-scale thermal spray fabrication of nanostructured coatings using appropriately designed hollow spherical powder.
关键词： nanostructured coatings,plasma spray,titania nanoparticles,photocatalytic performances,hollow microspheres
更新于2025-09-09 09:28:46