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  Electrocatalytic Oxygen Evolution on Iridium Oxide: Uncovering Catalyst-Substrate Interactions and Active Iridium Oxide Species

Reier, T., Teschner, D., Lunkenbein, T., Bergmann, A., Selve, S., Kraehnert, R., et al. (2014). Electrocatalytic Oxygen Evolution on Iridium Oxide: Uncovering Catalyst-Substrate Interactions and Active Iridium Oxide Species. Journal of the Electrochemical Society, 161(9), F876-F882. doi:10.1149/2.0411409jes.

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Reier_Strasser_manuscript_Ir_oxide_revised_final.pdf (Any fulltext), 1022KB
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 Creators:
Reier, T.1, Author
Teschner, Detre2, Author           
Lunkenbein, Thomas2, Author           
Bergmann, A.1, Author
Selve, S.3, Author
Kraehnert, R.1, Author
Schlögl, Robert2, Author           
Strasser, P.1, Author
Affiliations:
1The Electrochemical Energy, Catalysis, and Materials Science Laboratory, Technical University Berlin, Department of Chemistry, D-10623 Berlin, Germany , ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
3Zentraleinrichtung Elektronenmikroskopie, Technische Universität Berlin, D-10623 Berlin, Germany , ou_persistent22              

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 Abstract: The morphology, crystallinity, and chemical state of well-defined Ir oxide nanoscale thin-film catalysts prepared on Ti substrates at various calcination temperatures were investigated. Special emphasis was placed on the calcination temperature-dependent interaction between Ir oxide film and Ti substrate and its impact on the electrocatalytic oxygen evolution reaction (OER) activity. The Ir oxide films were characterized by scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and cyclic voltammetry. Furthermore, temperature programmed reduction was applied to study the Ir oxide species formed as a function of calcination temperature and its interaction with the Ti substrate. A previously unachieved correlation between the electrocatalytic OER activity and the nature and structural properties of the Ir oxide film was established. We find that the crystalline high temperature Ir oxide species is detrimental, whereas low temperature amorphous Ir oxy-hydroxides are highly active and efficient catalysts for the OER. Moreover, at the highest applied calcination temperature (550°C), Ti oxides, originating from the substrate, strongly affect chemical state and electrocatalytic OER activity of the Ir oxide film.

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Language(s): eng - English
 Dates: 2014-05-212014-04-072014-06-072014-06-07
 Publication Status: Issued
 Pages: 7
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1149/2.0411409jes
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Title: Journal of the Electrochemical Society
Source Genre: Journal
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Publ. Info: New York, NY : Electrochemical Society
Pages: - Volume / Issue: 161 (9) Sequence Number: - Start / End Page: F876 - F882 Identifier: ISSN: 0013-4651
CoNE: https://pure.mpg.de/cone/journals/resource/991042748197686