|
|
| Κωδικός Πόρου |
000428737 |
| Τίτλος |
Design of bulky substituted porphyrin arrays for light harvesting applications |
| Άλλος τίτλος |
Σχεδιασμός πορφυρινικών συστημάτων με ογκώδειες υποκαταστάτες για εφαρμογές εκμετάλλευσης της ηλιακής ακτινοβολίας |
|
Συγγραφέας
|
Χαρισιάδης, Αστέριος Δ
|
|
Σύμβουλος διατριβής
|
Κουτσολέλος, Αθανάσιος Γ.
|
|
Μέλος κριτικής επιτροπής
|
Αγγαρίδης, Παναγιώτης
Δημάδης, Κωνσταντίνος
Κιτσόπουλος, Θεοφάνης
Μήλιος, Κωνσταντίνος
Ταγματάρχης, Νικόλαος
Τρικαλίτης, Παντελής
|
| Περίληψη |
This Doctoral Thesis describes the development of novel porphyrin conjugates and
their investigation as photosensitizers in numerous solar energy harvesting applications.
Particularly, several appropriately designed porphyrin entities are presented herein that
were either functionalized with appropriate bulky peripheral substituents or other units,
such as fullerenes, cobalt-catalyst or boron dipyrromethene (BODIPY) compounds.
These newly formed porphyrin-based entities were comprehensively examined as lightharnessers
in artificial photosynthetic schemes, in dye-sensitized solar cells, in photoelectrochemical
hydrogen evolving devices and in light-emitting electrochemical cells.
In order to achieve the formation of the different reported hybrids, various synthetic
approaches were applied.
In the third chapter of this dissertation, steady-state and time-resolved photophysical
investigations of the energy/electron transfer processes in artificial photosynthetic
models are reported. Particularly, these systems are comprised of molecules that act as
energy donors, fullerene-derivatives as electron acceptors and electron donating
porphyrin entities. For the successful construction of these supramolecucar assemblies,
two different types of non-covalent interactions were employed, namely electrostatic
interactions and metal to ligand coordination. Various parameters that determine the
efficacy of such arrays were thoroughly investigated, such as the association constant
and the lifetime of the charge-separated state.
The next section deals with the synthesis of various porphyrin-based derivatives and
their application as photosensitizers in photovoltaic devices. Specifically, two modified
porphyrin derivatives bearing different anchoring groups, a new porphyrin-fullerene
dyad and four porphyrin-ruthenium polypyridyl complex dyads have been prepared and
studied as sensitizers in n- and p-type dye-sensitized solar cells. Bulky substituents were
inserted in the peripheries of all synthesized compounds, in order to eliminate the
formation of aggregates onto the semiconductor surface that is one of the major limiting
factors of such devices. Depending on the features that each derivative possesses, they
were incorporated and studied in the corresponding configuration of solar cells.
Furthermore, we connected a zinc-porphyrin to a cobalt catalytic unit, and the produced
dyad was incorporated in a dye-sensitized photo-electrochemical solar cell toward
hydrogen production. This system was fully characterized and fluorescence
spectroscopic measurements, in particular, revealed that an electron transfer possibly
occurs from the porphyrin sensitizer to the catalyst. This indication was confirmed by
the catalytic experiments conducted, since hydrogen evolution was detected upon
device operation.
Last but not least, four triazole-linked porphyrin-BODIPY polyads were prepared, in
which an increasing number of BODIPY chromophores were connected to the
periphery of the central platinum-porphyrinic core. The photo-physical and
electrochemical characterization of the novel polyads are presented in this part of the
thesis. These hybrids will be used as red-emitters in light-emitting electrochemical cells
and these measurements are still in progress.
|
| Φυσική περιγραφή |
xxxi, 277 σ. : πίν., σχήμ., εικ. ; 30 εκ. |
| Γλώσσα |
Αγγλικά |
| Θέμα |
BODIPY |
|
Cobalt catalyst |
|
Dye-sensitized photo-electrochemical solar cell |
|
Dye-sensitized solar cells |
|
Energy/electron transfer |
|
Fullerene |
|
H2 evolution |
|
Light-emitting electrochemical cells |
|
Ηλεκτροχημικά κελιά εκπομπής φωτός |
|
Ηλιακές κυψελίδες |
|
Καταλύτης κοβαλτίου |
|
Μεταφορά ενέργειας/ηλεκτρονίων |
|
Παραγωγή H2 |
|
Πορφυρίνη |
|
Φουλερένιο |
|
Φωτο-ηλεκτροχημικά κελιά φωτοευαισθητοποιούμενης χρωστικής |
|
Φωτοευαισθητοποιούμενης χρωστικής |
| Ημερομηνία έκδοσης |
2020-01-10 |
| Συλλογή
|
Σχολή/Τμήμα--Σχολή Θετικών και Τεχνολογικών Επιστημών--Τμήμα Χημείας--Διδακτορικές διατριβές
|
|
|
Τύπος Εργασίας--Διδακτορικές διατριβές
|
| Εμφανίσεις |
799 |
Design of bulky substituted porphyrin arrays for light harvesting applications
