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  Assessing Optical and Electrical Properties of Highly Active IrOx Catalysts for the Electrochemical Oxygen Evolution Reaction via Spectroscopic Ellipsometry

Sachse, R., Pflüger, M., Velasco Vélez, J., Sahre, M., Radnik, J., Bernicke, M., et al. (2020). Assessing Optical and Electrical Properties of Highly Active IrOx Catalysts for the Electrochemical Oxygen Evolution Reaction via Spectroscopic Ellipsometry. ACS Catalysis, 10(23), 14210-14223. doi:10.1021/acscatal.0c03800.

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acscatal.0c03800.pdf (Verlagsversion), 4MB
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2020
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 Urheber:
Sachse, René1, 2, Autor
Pflüger, Mika3, Autor
Velasco Vélez, Juan4, 5, Autor           
Sahre, Mario1, Autor
Radnik, Jörg1, Autor
Bernicke, Michael2, Autor
Bernsmeier, Denis2, Autor
Hodoroaba, Vasile-Dan1, Autor
Krumrey, Michael3, Autor
Strasser, Peter6, Autor
Kraehnert, Ralph2, Autor
Hertwig, Andreas1, Autor
Affiliations:
1Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 44-46, Berlin, 12203, Germany, ou_persistent22              
2Faculty II Mathematics and Natural Sciences, Institute of Chemistry, Technische Universität Berlin, Straße des 17. Juni 135, Berlin, 10623, Germany, ou_persistent22              
3Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, Berlin, 10587, Germany, ou_persistent22              
4Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
5Department of Heterogenous Reactions, Max Planck Institute for Chemical Energy Conversion, Mülheim and der Ruhr, 45470, Germany, ou_persistent22              
6Faculty II Mathematics and Natural Sciences, Department of Chemistry, Technical University Berlin, Berlin, 10623, Germany, ou_persistent22              

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 Zusammenfassung: Efficient water electrolysis requires highly active electrodes. The activity of corresponding catalytic coatings strongly depends on material properties such as film thickness, crystallinity, electrical conductivity, and chemical surface speciation. Measuring these properties with high accuracy in vacuum-free and non-destructive methods facilitates the elucidation of structure–activity relationships in realistic environments. Here, we report a novel approach to analyze the optical and electrical properties of highly active oxygen evolution reaction (OER) catalysts via spectroscopic ellipsometry (SE). Using a series of differently calcined, mesoporous, templated iridium oxide films as an example, we assess the film thickness, porosity, electrical resistivity, electron concentration, electron mobility, and interband and intraband transition energies by modeling of the optical spectra. Independently performed analyses using scanning electron microscopy, energy-dispersive X-ray spectroscopy, ellipsometric porosimetry, X-ray reflectometry, and absorption spectroscopy indicate a high accuracy of the deduced material properties. A comparison of the derived analytical data from SE, resonant photoemission spectroscopy, X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy with activity measurements of the OER suggests that the intrinsic activity of iridium oxides scales with a shift of the Ir 5d t2g sub-level and an increase of p–d interband transition energies caused by a transition of μ1-OH to μ3-O species.

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Sprache(n): eng - English
 Datum: 2020-08-312020-11-202020-12-04
 Publikationsstatus: Erschienen
 Seiten: 14
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1021/acscatal.0c03800
 Art des Abschluß: -

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Titel: ACS Catalysis
  Kurztitel : ACS Catal.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Washington, DC : ACS
Seiten: 14 Band / Heft: 10 (23) Artikelnummer: - Start- / Endseite: 14210 - 14223 Identifikator: ISSN: 2155-5435
CoNE: https://pure.mpg.de/cone/journals/resource/2155-5435