{"id":{"repo_id":"greece","oai_identifier":"oai:10442/0552"},"canonical_url":"https://search.dev.ndltd.org/etd/greece/oai:10442/0552","repository":{"repo_id":"greece","name":"Greek National Archive of PhD Theses","base_url":"https://phdtheses.ekt.gr/eadd_oai/request"},"display":{"title":"ΜΕΛΕΤΗ ΤΗΣ ΦΩΤΟΧΗΜΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΩΝ ΒΟΛΦΡΑΜΙΟΥ ΚΑΙ ΜΟΛΥΒΔΑΙΝΙΟΥ ΣΧΕΤΙΚΑ ΜΕ ΤΗΝ ΕΦΑΡΜΟΓΗ ΤΟΥΣ ΣΕ ΦΩΤΟΗΛΕΚΤΡΟΧΗΜΙΚΑ ΣΤΟ...","abstract":"HETEROPOLYCOMPOUNDS OF THE KEGGIN-DAWSON STRUCTURES UNDERGO MULTIELECTRON PHOTOREDUCTION IN THE PRESENCE OF A GREAT VARIETY OF ORGANIC REAGENTS IN NEAR VISIBLE AND UV LIGHT WITH CONCOMITANT OXIDATION OF THE ORGANIC SPECIES, WHICH IS CONSUMED DURING THE REACTION. THE PHOTOREDUCED \"LIGHT\" HALF CELL AND A SIMILAR \"DARK\" CELL IS THE BASIS FOR THE PHOTOGALVANIC CELL STUDIED. CONNECTION BETWEEN THETWO HALF-CELLS BOTH WITH PT ELECTRODES, PRODUCES A CURRENT UNTIL EQUILIBRIUM IS ESTABLISHED. THE \"DARK\" CELL IS AIR OXIDIZED TO THE ORIGINAL NON REDUCED FORMWHEREAS LIGHT REGENERATES THE REDUCED \"LIGHT\" HALF-CELL. IT TURNED OUT THAT 1:12 HETEROPOLYTUNGSTATES WITH THE KEGGIN STRUCTURES WERE CAPABLE TO PRODUCE HYDROGEN WITH A PT CATALYST OR WITHOUT IT AS WELL. PHOTOREDUCTION PROCEEDS TO THE EXTENT THAT THE RATE OF PHOTOREDUCTION MATCHES THE BACK-REOXIDATION BY HYDROGEN.THE REDUCTION STEP AT WHICH THIS TAKES PLACE DEPENDS ON THE TUNGSTATE USED.","abstract_html":"HETEROPOLYCOMPOUNDS OF THE KEGGIN-DAWSON STRUCTURES UNDERGO MULTIELECTRON PHOTOREDUCTION IN THE PRESENCE OF A GREAT VARIETY OF ORGANIC REAGENTS IN NEAR VISIBLE AND UV LIGHT WITH CONCOMITANT OXIDATION OF THE ORGANIC SPECIES, WHICH IS CONSUMED DURING THE REACTION. THE PHOTOREDUCED "LIGHT" HALF CELL AND A SIMILAR "DARK" CELL IS THE BASIS FOR THE PHOTOGALVANIC CELL STUDIED. CONNECTION BETWEEN THETWO HALF-CELLS BOTH WITH PT ELECTRODES, PRODUCES A CURRENT UNTIL EQUILIBRIUM IS ESTABLISHED. THE "DARK" CELL IS AIR OXIDIZED TO THE ORIGINAL NON REDUCED FORMWHEREAS LIGHT REGENERATES THE REDUCED "LIGHT" HALF-CELL. IT TURNED OUT THAT 1:12 HETEROPOLYTUNGSTATES WITH THE KEGGIN STRUCTURES WERE CAPABLE TO PRODUCE HYDROGEN WITH A PT CATALYST OR WITHOUT IT AS WELL. PHOTOREDUCTION PROCEEDS TO THE EXTENT THAT THE RATE OF PHOTOREDUCTION MATCHES THE BACK-REOXIDATION BY HYDROGEN.THE REDUCTION STEP AT WHICH THIS TAKES PLACE DEPENDS ON THE TUNGSTATE USED.","abstract_has_math":false,"creators":["Ιωαννίδης, Αθανάσιος"],"institution":"Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1987,"date_issued":"1987","date_published":"1987","updated_at":"2026-07-24T02:25:21Z","subjects":["HETEROPOLYCOMPOUNDS","Hydrogen production","Molybdenum","PHOTOCHEMISTRY INORGANIC","PHOTOGALVANIC CELLS","Solar energy","Tungsten","Βολφράμιο","ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΙΣ","Ηλιακή ενέργεια","Μολυβδαίνιο","Υδρογόνο","ΦΩΤΟΓΑΛΒΑΝΙΚΑ ΣΤΟΙΧΕΙΑ","ΦΩΤΟΧΗΜΕΙΑ ΑΝΟΡΓΑΝΗ","Engineering and Technology","Chemical Engineering","Επιστήμες Μηχανικού και Τεχνολογία","Επιστήμη Χημικού Μηχανικού"],"languages":["gre"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["10.12681/eadd/0552"],"render_values":[{"text":"10.12681/eadd/0552","href":"https://doi.org/10.12681/eadd/0552","code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10442/hedi/0552","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Ιωαννίδης, Αθανάσιος"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1987"]},{"key":"dc:publisher","label":"Institution","values":["Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)","National Technical University of Athens (NTUA)"]},{"key":"dc:type","label":"Dc Type","values":["PhD Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["HETEROPOLYCOMPOUNDS","Hydrogen production","Molybdenum","PHOTOCHEMISTRY INORGANIC","PHOTOGALVANIC CELLS","Solar energy","Tungsten","Βολφράμιο","ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΙΣ","Ηλιακή ενέργεια","Μολυβδαίνιο","Υδρογόνο","ΦΩΤΟΓΑΛΒΑΝΙΚΑ ΣΤΟΙΧΕΙΑ","ΦΩΤΟΧΗΜΕΙΑ ΑΝΟΡΓΑΝΗ","Engineering and Technology","Chemical Engineering","Επιστήμες Μηχανικού και Τεχνολογία","Επιστήμη Χημικού Μηχανικού"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["gre"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["10.12681/eadd/0552","http://hdl.handle.net/10442/hedi/0552"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["HETEROPOLYCOMPOUNDS OF THE KEGGIN-DAWSON STRUCTURES UNDERGO MULTIELECTRON PHOTOREDUCTION IN THE PRESENCE OF A GREAT VARIETY OF ORGANIC REAGENTS IN NEAR VISIBLE AND UV LIGHT WITH CONCOMITANT OXIDATION OF THE ORGANIC SPECIES, WHICH IS CONSUMED DURING THE REACTION. THE PHOTOREDUCED \"LIGHT\" HALF CELL AND A SIMILAR \"DARK\" CELL IS THE BASIS FOR THE PHOTOGALVANIC CELL STUDIED. CONNECTION BETWEEN THETWO HALF-CELLS BOTH WITH PT ELECTRODES, PRODUCES A CURRENT UNTIL EQUILIBRIUM IS ESTABLISHED. THE \"DARK\" CELL IS AIR OXIDIZED TO THE ORIGINAL NON REDUCED FORMWHEREAS LIGHT REGENERATES THE REDUCED \"LIGHT\" HALF-CELL. IT TURNED OUT THAT 1:12 HETEROPOLYTUNGSTATES WITH THE KEGGIN STRUCTURES WERE CAPABLE TO PRODUCE HYDROGEN WITH A PT CATALYST OR WITHOUT IT AS WELL. PHOTOREDUCTION PROCEEDS TO THE EXTENT THAT THE RATE OF PHOTOREDUCTION MATCHES THE BACK-REOXIDATION BY HYDROGEN.THE REDUCTION STEP AT WHICH THIS TAKES PLACE DEPENDS ON THE TUNGSTATE USED.","ΟΙ ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΙΣ ΤΩΝ ΔΟΜΩΝ KEGGIN-DAWSON ΥΦΙΣΤΑΝΤΑΙ ΠΟΛΥΗΛΕΚΤΡΟΝΙΑΚΗ ΦΩΤΟΑΝΑΓΩΓΗ ΠΑΡΟΥΣΙΑ ΜΕΓΑΛΗΣ ΠΟΙΚΙΛΙΑΣ ΟΡΓΑΝΙΚΩΝ ΕΝΩΣΕΩΝ ΣΤΟ ΙΩΔΕΣ ΚΑΙ ΥΠΕΡΙΩΔΕΣ ΦΩΣ, ΥΠΟ ΣΥΓΧΡΟΝΗ ΟΞΕΙΔΩΣΗ ΚΑΙ ΚΑΤΑΝΑΛΩΣΗ ΤΗΣ ΟΡΓΑΝΙΚΗΣ ΟΥΣΙΑΣ. ΕΞΑΛΛΟΥ Η ΔΙΑΦΟΡΑ ΔΥΝΑΜΙΚΟΥ ΠΟΥ ΑΝΑΠΤΥΣΣΕΤΑΙ ΜΕΤΑΞΥ ΕΝΟΣ ΦΩΤΙΖΟΜΕΝΟΥ ΚΑΙ ΕΝΟΣ ΟΜΟΙΟΥ ΜΕ ΑΥΤΟ, ΣΚΟΤΕΙΝΟΥ ΗΜΙΣΤΟΙΧΕΙΟΥ ΑΠΟΤΕΛΕΙ ΤΗΝ ΚΕΝΤΡΙΚΗ ΙΔΕΑ ΤΟΥ ΦΩΤΟΓΑΛΒΑΝΙΚΟΥ ΣΤΟΙΧΕΙΟΥ ΠΟΥ ΜΕΛΕΤΗΘΗΚΕ. Η ΗΛΕΚΤΡΙΚΗ ΣΥΝΔΕΣΗ ΤΩΝ ΔΥΟ ΗΜΙΣΤΟΙΧΕΙΩΝ, ΕΦΟΔΙΑΣΜΕΝΩΝ ΜΕ ΗΛΕΚΤΡΟΔΙΑΛΕΥΚΟΧΡΥΣΟΥ ΟΔΗΓΕΙ ΣΤΗΝ ΡΟΗ ΡΕΥΜΑΤΟΣ ΜΕΧΡΙ ΤΗΝ ΑΠΟΚΑΤΑΣΤΑΣΗ ΙΣΟΡΡΟΠΙΑΣ. ΤΟ ΣΚΟΤΕΙΝΟ ΗΜΙΣΤΟΙΧΕΙΟ ΟΞΕΙΔΩΝΕΤΑΙ ΣΥΝΕΧΩΣ ΜΕ ΑΕΡΑ ΣΤΗΝ ΑΡΧΙΚΗ ΟΞΕΙΔΩΜΕΝΗ ΜΟΡΦΗ, ΕΝΩΤΟ ΦΩΣ ΑΝΑΓΕΝΝΑ ΤΗΝ ΑΝΗΓΜΕΝΗ ΜΟΡΦΗ ΣΤΟ ΦΩΤΕΙΝΟ ΗΜΙΣΤΟΙΧΕΙΟ. ΑΠΟΔΕΙΧΘΗΚΕ ΟΤΙ ΟΙΕΤΕΡΟΠΟΛΥΕΝΩΣΕΙΣ ΤΟΥ ΒΟΛΦΡΑΜΙΟΥ ΤΗΣ ΣΕΙΡΑΣ 1:12 ΜΕ ΔΟΜΗ KEGGIN ΗΤΑΝ ΙΚΑΝΕΣ, ΦΩΤΟΛΥΟΜΕΝΕΣ, ΝΑ ΠΑΡΑΓΟΥΝ ΥΔΡΟΓΟΝΟ ΤΟΣΟ ΠΑΡΟΥΣΙΑ ΚΑΤΑΛΥΤΗ ΡΤ ΟΣΟ ΚΑΙ ΧΩΡΙΣ ΑΥΤΟΝ.Η ΦΩΤΟΑΝΑΓΩΓΗ ΠΡΟΧΩΡΕΙ ΜΕΧΡΙ ΤΟ ΣΗΜΕΙΟ, ΠΟΥ Η ΤΑΧΥΤΗΤΑ ΤΗΣ ΕΞΙΣΟΡΡΟΠΕΙ ΤΗΝ ΤΑΧΥΤΗΤΑ ΑΝΑΓΩΓΗΣ ΤΩΝ ΠΡΩΤΟΝΙΩΝ (ΣΤΑΣΙΜΗ ΚΑΤΑΣΤΑΣΗ). Η ΕΚΤΑΣΗ ΤΗΣ ΑΝΑΓΩΓΗΣ ΣΤΗΝ ΣΤΑΣΙΜΗ ΚΑΤΑΣΤΑΣΗ ΕΞΑΡΤΑΤΑΙ ΑΠΟ ΤΗΝ ΕΤΕΡΟΠΟΛΥΕΝΩΣΗ ΠΟΥ ΧΡΗΣΙΜΟΠΟΙΕΙΤΑΙ."]},{"key":"dc:title","label":"Title","values":["ΜΕΛΕΤΗ ΤΗΣ ΦΩΤΟΧΗΜΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΩΝ ΒΟΛΦΡΑΜΙΟΥ ΚΑΙ ΜΟΛΥΒΔΑΙΝΙΟΥ ΣΧΕΤΙΚΑ ΜΕ ΤΗΝ ΕΦΑΡΜΟΓΗ ΤΟΥΣ ΣΕ ΦΩΤΟΗΛΕΚΤΡΟΧΗΜΙΚΑ ΣΤΟ...","A STUDY ON THE PHOTOCHEMICAL BEHAVIOUR OF HETEROPOLYTUNGSTATES AND MOLYBDATES IN RELATION WITH THEIR APPLICATION TO PHOTOELECTROCHEMICAL CELLS AND PHOTOCHEMICAL PRODUCTION OF HYDROGEN"]}]}],"canonical_facts":{"dc:creator":["Ιωαννίδης, Αθανάσιος"],"dc:date":["1987"],"dc:description":["HETEROPOLYCOMPOUNDS OF THE KEGGIN-DAWSON STRUCTURES UNDERGO MULTIELECTRON PHOTOREDUCTION IN THE PRESENCE OF A GREAT VARIETY OF ORGANIC REAGENTS IN NEAR VISIBLE AND UV LIGHT WITH CONCOMITANT OXIDATION OF THE ORGANIC SPECIES, WHICH IS CONSUMED DURING THE REACTION. THE PHOTOREDUCED \"LIGHT\" HALF CELL AND A SIMILAR \"DARK\" CELL IS THE BASIS FOR THE PHOTOGALVANIC CELL STUDIED. CONNECTION BETWEEN THETWO HALF-CELLS BOTH WITH PT ELECTRODES, PRODUCES A CURRENT UNTIL EQUILIBRIUM IS ESTABLISHED. THE \"DARK\" CELL IS AIR OXIDIZED TO THE ORIGINAL NON REDUCED FORMWHEREAS LIGHT REGENERATES THE REDUCED \"LIGHT\" HALF-CELL. IT TURNED OUT THAT 1:12 HETEROPOLYTUNGSTATES WITH THE KEGGIN STRUCTURES WERE CAPABLE TO PRODUCE HYDROGEN WITH A PT CATALYST OR WITHOUT IT AS WELL. PHOTOREDUCTION PROCEEDS TO THE EXTENT THAT THE RATE OF PHOTOREDUCTION MATCHES THE BACK-REOXIDATION BY HYDROGEN.THE REDUCTION STEP AT WHICH THIS TAKES PLACE DEPENDS ON THE TUNGSTATE USED.","ΟΙ ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΙΣ ΤΩΝ ΔΟΜΩΝ KEGGIN-DAWSON ΥΦΙΣΤΑΝΤΑΙ ΠΟΛΥΗΛΕΚΤΡΟΝΙΑΚΗ ΦΩΤΟΑΝΑΓΩΓΗ ΠΑΡΟΥΣΙΑ ΜΕΓΑΛΗΣ ΠΟΙΚΙΛΙΑΣ ΟΡΓΑΝΙΚΩΝ ΕΝΩΣΕΩΝ ΣΤΟ ΙΩΔΕΣ ΚΑΙ ΥΠΕΡΙΩΔΕΣ ΦΩΣ, ΥΠΟ ΣΥΓΧΡΟΝΗ ΟΞΕΙΔΩΣΗ ΚΑΙ ΚΑΤΑΝΑΛΩΣΗ ΤΗΣ ΟΡΓΑΝΙΚΗΣ ΟΥΣΙΑΣ. ΕΞΑΛΛΟΥ Η ΔΙΑΦΟΡΑ ΔΥΝΑΜΙΚΟΥ ΠΟΥ ΑΝΑΠΤΥΣΣΕΤΑΙ ΜΕΤΑΞΥ ΕΝΟΣ ΦΩΤΙΖΟΜΕΝΟΥ ΚΑΙ ΕΝΟΣ ΟΜΟΙΟΥ ΜΕ ΑΥΤΟ, ΣΚΟΤΕΙΝΟΥ ΗΜΙΣΤΟΙΧΕΙΟΥ ΑΠΟΤΕΛΕΙ ΤΗΝ ΚΕΝΤΡΙΚΗ ΙΔΕΑ ΤΟΥ ΦΩΤΟΓΑΛΒΑΝΙΚΟΥ ΣΤΟΙΧΕΙΟΥ ΠΟΥ ΜΕΛΕΤΗΘΗΚΕ. Η ΗΛΕΚΤΡΙΚΗ ΣΥΝΔΕΣΗ ΤΩΝ ΔΥΟ ΗΜΙΣΤΟΙΧΕΙΩΝ, ΕΦΟΔΙΑΣΜΕΝΩΝ ΜΕ ΗΛΕΚΤΡΟΔΙΑΛΕΥΚΟΧΡΥΣΟΥ ΟΔΗΓΕΙ ΣΤΗΝ ΡΟΗ ΡΕΥΜΑΤΟΣ ΜΕΧΡΙ ΤΗΝ ΑΠΟΚΑΤΑΣΤΑΣΗ ΙΣΟΡΡΟΠΙΑΣ. ΤΟ ΣΚΟΤΕΙΝΟ ΗΜΙΣΤΟΙΧΕΙΟ ΟΞΕΙΔΩΝΕΤΑΙ ΣΥΝΕΧΩΣ ΜΕ ΑΕΡΑ ΣΤΗΝ ΑΡΧΙΚΗ ΟΞΕΙΔΩΜΕΝΗ ΜΟΡΦΗ, ΕΝΩΤΟ ΦΩΣ ΑΝΑΓΕΝΝΑ ΤΗΝ ΑΝΗΓΜΕΝΗ ΜΟΡΦΗ ΣΤΟ ΦΩΤΕΙΝΟ ΗΜΙΣΤΟΙΧΕΙΟ. ΑΠΟΔΕΙΧΘΗΚΕ ΟΤΙ ΟΙΕΤΕΡΟΠΟΛΥΕΝΩΣΕΙΣ ΤΟΥ ΒΟΛΦΡΑΜΙΟΥ ΤΗΣ ΣΕΙΡΑΣ 1:12 ΜΕ ΔΟΜΗ KEGGIN ΗΤΑΝ ΙΚΑΝΕΣ, ΦΩΤΟΛΥΟΜΕΝΕΣ, ΝΑ ΠΑΡΑΓΟΥΝ ΥΔΡΟΓΟΝΟ ΤΟΣΟ ΠΑΡΟΥΣΙΑ ΚΑΤΑΛΥΤΗ ΡΤ ΟΣΟ ΚΑΙ ΧΩΡΙΣ ΑΥΤΟΝ.Η ΦΩΤΟΑΝΑΓΩΓΗ ΠΡΟΧΩΡΕΙ ΜΕΧΡΙ ΤΟ ΣΗΜΕΙΟ, ΠΟΥ Η ΤΑΧΥΤΗΤΑ ΤΗΣ ΕΞΙΣΟΡΡΟΠΕΙ ΤΗΝ ΤΑΧΥΤΗΤΑ ΑΝΑΓΩΓΗΣ ΤΩΝ ΠΡΩΤΟΝΙΩΝ (ΣΤΑΣΙΜΗ ΚΑΤΑΣΤΑΣΗ). Η ΕΚΤΑΣΗ ΤΗΣ ΑΝΑΓΩΓΗΣ ΣΤΗΝ ΣΤΑΣΙΜΗ ΚΑΤΑΣΤΑΣΗ ΕΞΑΡΤΑΤΑΙ ΑΠΟ ΤΗΝ ΕΤΕΡΟΠΟΛΥΕΝΩΣΗ ΠΟΥ ΧΡΗΣΙΜΟΠΟΙΕΙΤΑΙ."],"dc:identifier":["10.12681/eadd/0552","http://hdl.handle.net/10442/hedi/0552"],"dc:language":["gre"],"dc:publisher":["Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)","National Technical University of Athens (NTUA)"],"dc:subject":["HETEROPOLYCOMPOUNDS","Hydrogen production","Molybdenum","PHOTOCHEMISTRY INORGANIC","PHOTOGALVANIC CELLS","Solar energy","Tungsten","Βολφράμιο","ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΙΣ","Ηλιακή ενέργεια","Μολυβδαίνιο","Υδρογόνο","ΦΩΤΟΓΑΛΒΑΝΙΚΑ ΣΤΟΙΧΕΙΑ","ΦΩΤΟΧΗΜΕΙΑ ΑΝΟΡΓΑΝΗ","Engineering and Technology","Chemical Engineering","Επιστήμες Μηχανικού και Τεχνολογία","Επιστήμη Χημικού Μηχανικού"],"dc:title":["ΜΕΛΕΤΗ ΤΗΣ ΦΩΤΟΧΗΜΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΩΝ ΒΟΛΦΡΑΜΙΟΥ ΚΑΙ ΜΟΛΥΒΔΑΙΝΙΟΥ ΣΧΕΤΙΚΑ ΜΕ ΤΗΝ ΕΦΑΡΜΟΓΗ ΤΟΥΣ ΣΕ ΦΩΤΟΗΛΕΚΤΡΟΧΗΜΙΚΑ ΣΤΟ...","A STUDY ON THE PHOTOCHEMICAL BEHAVIOUR OF HETEROPOLYTUNGSTATES AND MOLYBDATES IN RELATION WITH THEIR APPLICATION TO PHOTOELECTROCHEMICAL CELLS AND PHOTOCHEMICAL PRODUCTION OF HYDROGEN"],"dc:type":["PhD Thesis"]},"updated_at":"2026-07-24T02:25:21Z"}