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
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Anmerkungen
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Albert-Ludwigs-Universität Freiburg, Dissertation, 2016
- Klassifikation
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Chemie
- Schlagwort
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Elektrolyse
- Ereignis
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Veröffentlichung
- (wo)
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Freiburg
- (wer)
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Universität
- (wann)
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2016
- Urheber
- Beteiligte Personen und Organisationen
- DOI
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10.6094/UNIFR/10856
- URN
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urn:nbn:de:bsz:25-freidok-108563
- Rechteinformation
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Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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25.03.2025, 13:56 MEZ
Datenpartner
Deutsche Nationalbibliothek. Bei Fragen zum Objekt wenden Sie sich bitte an den Datenpartner.
Objekttyp
- Hochschulschrift
Beteiligte
- Lee, Seung Young
- Kurz, Philipp
- Universität
Entstanden
- 2016
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