Post-graduate theses
Current Record: 55 of 124
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Identifier |
000425456 |
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h |
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
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Δασκαλάκης, Ιωάννης
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Thesis advisor
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Αρματάς, Γεράσιμος
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Reviewer
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Κιοσέογλου, Γεώργιος
Μήλιος, Κωνσταντίνος
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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.
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Language |
English |
Issue date |
2019-11-29 |
Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/3/9/f/metadata-dlib-1572519161-750458-28481.tkl
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Views |
301 |