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Operando Raman Spectroscopy of Transition Metal Oxide Catalysts in Regard to the Oxygen Evolution Reaction

Radinger, Hannes (2023)
Operando Raman Spectroscopy of Transition Metal Oxide Catalysts in Regard to the Oxygen Evolution Reaction.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00023374
Masterarbeit, Erstveröffentlichung, Verlagsversion

Kurzbeschreibung (Abstract)

Transition metal oxides (NiO x , MnO x) have been synthesized by reactive magnetron sputtering and analysed regarding their chemical composition with XPS to develop active catalysts for the oxygen evolution reaction in alkaline media. NiO x was investigated towards its temperature dependent deficient structure and the enhancement of the catalytic activity through these defects. The catalytic activity was evaluated with the help of operando Raman spectroscopy to monitor the active surface intermediates of NiO x and investigate a temperature dependent Ni III /Ni IV redox transition. The defect structure was concluded to greatly improve catalytic activity, capacitive charge storage, and redox processes. MnO x was deposited in three different oxidation states (Mn II , Mn III , and Mn IV) as concluded with XPS and investigated towards its suitability as OER catalyst. With Raman spectroscopy, all MnO x revealed δ-MnO 2 structure when in contact with the alkaline electrolyte. Their catalytic activity was detected to differ based on their degree of charging with an applied potential, i.e. the coexistence of Mn III and MnIV species, and an increased distance between layers of MnO 6 octahedra. With a combination of reduction and activation processes, the activity of Mn II was altered greatly, to receive a by more than 100 mV reduced overpotential at 5 mA cm −2 , and a low Tafel slope of 44 mV dec −1 .

Typ des Eintrags: Masterarbeit
Erschienen: 2023
Autor(en): Radinger, Hannes
Art des Eintrags: Erstveröffentlichung
Titel: Operando Raman Spectroscopy of Transition Metal Oxide Catalysts in Regard to the Oxygen Evolution Reaction
Sprache: Englisch
Referenten: Kaiser, PD Dr. Bernhard ; Jaegermann, Prof. Dr. Wolfram ; Stark, Prof. Dr. Robert
Publikationsjahr: 2023
Ort: Darmstadt
Kollation: 91, IX Seiten
DOI: 10.26083/tuprints-00023374
URL / URN: https://tuprints.ulb.tu-darmstadt.de/23374
Kurzbeschreibung (Abstract):

Transition metal oxides (NiO x , MnO x) have been synthesized by reactive magnetron sputtering and analysed regarding their chemical composition with XPS to develop active catalysts for the oxygen evolution reaction in alkaline media. NiO x was investigated towards its temperature dependent deficient structure and the enhancement of the catalytic activity through these defects. The catalytic activity was evaluated with the help of operando Raman spectroscopy to monitor the active surface intermediates of NiO x and investigate a temperature dependent Ni III /Ni IV redox transition. The defect structure was concluded to greatly improve catalytic activity, capacitive charge storage, and redox processes. MnO x was deposited in three different oxidation states (Mn II , Mn III , and Mn IV) as concluded with XPS and investigated towards its suitability as OER catalyst. With Raman spectroscopy, all MnO x revealed δ-MnO 2 structure when in contact with the alkaline electrolyte. Their catalytic activity was detected to differ based on their degree of charging with an applied potential, i.e. the coexistence of Mn III and MnIV species, and an increased distance between layers of MnO 6 octahedra. With a combination of reduction and activation processes, the activity of Mn II was altered greatly, to receive a by more than 100 mV reduced overpotential at 5 mA cm −2 , and a low Tafel slope of 44 mV dec −1 .

Status: Verlagsversion
URN: urn:nbn:de:tuda-tuprints-233745
Sachgruppe der Dewey Dezimalklassifikatin (DDC): 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
500 Naturwissenschaften und Mathematik > 540 Chemie
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung
Hinterlegungsdatum: 23 Mär 2023 10:38
Letzte Änderung: 24 Mär 2023 07:37
PPN:
Referenten: Kaiser, PD Dr. Bernhard ; Jaegermann, Prof. Dr. Wolfram ; Stark, Prof. Dr. Robert
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