Hochschulschrift
Manganese oxides as electrocatalyst for the water-oxidation reaction
Zusammenfassung: A mild screen-printing method was developed to coat conductive oxide surfaces (FTO) with μm-thick layers of pre-synthesised calcium manganese oxide (Ca-birnessite) particles. After optimization steps concerning printing process and layer thickness, electrodes were obtained which can be used as corrosion-stable water-oxidizing anodes at pH7 yielding current densities of 1mA·cm-2 at an overpotential of less than 500mV. Analyses of electrode coatings of optimal thickness (~10μm) indicated that composition, oxide phase and morphology of the synthetic Ca-birnessite particles are hardly affected by the screen-printing procedure. However, a more detailed analysis by X-ray absorption spectroscopy revealed small modifications of both Mn redox state and structure at the atomic level which could affect functional properties like proton conductivity.Furthermore, the versatile new screen-printing method was used for a comparative study of various transition metal oxides concerning electrochemical water oxidation at “artificial leaf conditions” (neutral pH, fairly low η and i), where a general activity ranking RuO2 > Co3O4~(Ca)MnOx~NiO was observed. Within the group of screened manganese oxides, Ca-birnessite performed better than “Mn-only materials” like Mn2O3 or MnO2
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Notes
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Albert-Ludwigs-Universität Freiburg, Dissertation, 2016
- Classification
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Chemie
- Keyword
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Elektrolyse
- Event
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Veröffentlichung
- (where)
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Freiburg
- (who)
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Universität
- (when)
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2016
- Creator
- Contributor
- DOI
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10.6094/UNIFR/10856
- URN
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urn:nbn:de:bsz:25-freidok-108563
- Rights
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Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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25.03.2025, 1:56 PM CET
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Object type
- Hochschulschrift
Associated
- Lee, Seung Young
- Kurz, Philipp
- Universität
Time of origin
- 2016
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