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Identifier 000425456
Title Development of mesoporous Zn1-xCuxS frameworks for photocatalytic water splitting toward hydrogen production
Alternative Title Ανάπτυξη σύνθετων μεσοπορώδων πλεγμάτων Zn1-xCuxS για την φωτοκαταλυτική διάσπαση του νερού προς παραγωγή υδρογόνου
Author Δασκαλάκης, Ιωάννης
Thesis advisor Αρματάς, Γεράσιμος
Reviewer Κιοσέογλου, Γεώργιος
Μήλιος, Κωνσταντίνος
Abstract As a potential answer to the global energy crisis and environmental pollution, the solar light hydrogen generation has recently attracted great attention. Currently, hydrogen is mainly being produced from fossil fuels or high-energy consumption processes, which are not environmentally friendly and economical methods. Since the first report by Fujishima and Honda on the photoelectrochemical water-splitting over a TiO2 electrode, photocatalytic hydrogen production has become a promising approach for clean, economical, and environmentally viable production of solar fuels. This master thesis focuses on synthesis, structural characterization and energy applications of new 3D mesoporous frameworks consisting of connected Cu-doped ZnS nanocrystals (Zn1-xCuxS; x = 0.02, 0.05, 0.10). In particular, we report the synthesis of high-surface-area mesoporous Zn1-xCuxS frameworks using a two-step chemical procedure that involves polymertemplated aggregating assembly of ZnS nanocrystals (~5 nm in size) and chemical transformation of ZnS constituents into Zn1-xCuxS heterostructures. The crystal structure, morphology and chemical composition of the prepared materials were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energydispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and N2 porosimetry. Also, the electronic band structure of the Zn1-xCuxS heterostructures was investigated by UV-vis/NIR optical absorption and electrochemical impedance spectroscopy (EIS). Moreover, we highlight the impact of Cu doping on the photochemical behavior and visible-light photocatalytic H2 production activity of the Zn1-xCuxS nanocrystal assemblies. An important aspect of this study is also the further improvement of the photocatalytic performance of Zn1-xCuxS catalysts by sulfur treatment.
Language English
Issue date 2019-11-29
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
  Type of Work--Post-graduate theses
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