Periyannan, Shanmugapriya (2020)
Metal oxide heterostructured films with controlled architecture for enhanced photocatalytic properties.
Technische Universität Darmstadt
doi: 10.25534/tuprints-00014103
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
Photocatalytic processes possess favourable features that could address the various issues concerning environmental pollution. Among these issues, treatment of polluted water and water splitting for renewable hydrogen production are extensively studied but are still confronted to limitations for achieving high photocatalytic efficiencies that could be suc- cessfully commercialized. Investigations on powder materials have been widely reported for pollutant degradation/water treatment, but difficulties are prevailing in the re-usability of the material. Moreover, there is the need for finding a suitable heterostructured photo- catalyst that could provide better charge kinetics, an ultimate goal in photocatalyst design. Therefore, in this work, we have investigated thin-film based heterostructure photocatalysts, for improving the photocatalytic activity, especially towards pollutant degradation. For this purpose, we have investigated the surface and interfacial properties of semiconductor/semiconductor (p-n type, NiO/ZnO) and metal/semiconductor (metal/n- type, RuO2/ZnO) heterostructures using systematic (step-by-step) interface studies, in order to gain knowledge regarding the influence of ZnO surface cleaning in the interfacial band bending, thereby analyzing the possibilities of their use as photocatalysts. Furthermore, we have explored the electrical, optical and interfacial properties of ZnO nanorods (n-type) with NiO coating (p-type) by varying the NiO deposition parame- ters, to identify an optimized heterostructure. We examined the photocatalytic performance of these films for pollutant (Rhodamine B) degradation. In parallel, we explored the inter- action of water with heterostructured (NiO/ZnO) photocatalysts, to interpret the surface reactions and their influence on interfacial band bending, a strategy for understanding the heterostructured photocatalysts, which was not explored before. Finally, we tested the ZnO nanorod film in an industrial research context for Rho- damine B degradation, to investigate the upscaling perspectives of the materials developed in this project.
Typ des Eintrags: | Dissertation | ||||
---|---|---|---|---|---|
Erschienen: | 2020 | ||||
Autor(en): | Periyannan, Shanmugapriya | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Metal oxide heterostructured films with controlled architecture for enhanced photocatalytic properties | ||||
Sprache: | Englisch | ||||
Referenten: | Jaegermann, Prof. Dr. Wolfram ; Cloots, Prof. Dr. Rudi | ||||
Publikationsjahr: | 2020 | ||||
Ort: | Darmstadt | ||||
Datum der mündlichen Prüfung: | 1 Juli 2019 | ||||
DOI: | 10.25534/tuprints-00014103 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/14103 | ||||
Kurzbeschreibung (Abstract): | Photocatalytic processes possess favourable features that could address the various issues concerning environmental pollution. Among these issues, treatment of polluted water and water splitting for renewable hydrogen production are extensively studied but are still confronted to limitations for achieving high photocatalytic efficiencies that could be suc- cessfully commercialized. Investigations on powder materials have been widely reported for pollutant degradation/water treatment, but difficulties are prevailing in the re-usability of the material. Moreover, there is the need for finding a suitable heterostructured photo- catalyst that could provide better charge kinetics, an ultimate goal in photocatalyst design. Therefore, in this work, we have investigated thin-film based heterostructure photocatalysts, for improving the photocatalytic activity, especially towards pollutant degradation. For this purpose, we have investigated the surface and interfacial properties of semiconductor/semiconductor (p-n type, NiO/ZnO) and metal/semiconductor (metal/n- type, RuO2/ZnO) heterostructures using systematic (step-by-step) interface studies, in order to gain knowledge regarding the influence of ZnO surface cleaning in the interfacial band bending, thereby analyzing the possibilities of their use as photocatalysts. Furthermore, we have explored the electrical, optical and interfacial properties of ZnO nanorods (n-type) with NiO coating (p-type) by varying the NiO deposition parame- ters, to identify an optimized heterostructure. We examined the photocatalytic performance of these films for pollutant (Rhodamine B) degradation. In parallel, we explored the inter- action of water with heterostructured (NiO/ZnO) photocatalysts, to interpret the surface reactions and their influence on interfacial band bending, a strategy for understanding the heterostructured photocatalysts, which was not explored before. Finally, we tested the ZnO nanorod film in an industrial research context for Rho- damine B degradation, to investigate the upscaling perspectives of the materials developed in this project. |
||||
Alternatives oder übersetztes Abstract: |
|
||||
URN: | urn:nbn:de:tuda-tuprints-141032 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften | ||||
Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung |
||||
Hinterlegungsdatum: | 26 Okt 2020 10:00 | ||||
Letzte Änderung: | 03 Nov 2020 06:09 | ||||
PPN: | |||||
Referenten: | Jaegermann, Prof. Dr. Wolfram ; Cloots, Prof. Dr. Rudi | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 1 Juli 2019 | ||||
Export: | |||||
Suche nach Titel in: | TUfind oder in Google |
Frage zum Eintrag |
Optionen (nur für Redakteure)
Redaktionelle Details anzeigen |