Chemical Epitaxy of Iridium Oxide on Tin Oxide Enhances Stability of Supported OER Catalyst Article Swipe
Melisande Kost
,
Matthias Kornherr
,
Peter M. Zehetmaier
,
Hannah Illner
,
D.S. Jeon
,
Hubert A. Gasteiger
,
Markus Döblinger
,
Dina Fattakhova‐Rohlfing
,
Thomas Bein
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1002/smll.202404118
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1002/smll.202404118
Significantly reducing the iridium content in oxygen evolution reaction (OER) catalysts while maintaining high electrocatalytic activity and stability is a key priority in the development of large‐scale proton exchange membrane (PEM) electrolyzers. In practical catalysts, this is usually achieved by depositing thin layers of iridium oxide on a dimensionally stable metal oxide support material that reduces the volumetric packing density of iridium in the electrode assembly. By comparing two support materials with different structure types, it is shown that the chemical nature of the metal oxide support can have a strong influence on the crystallization of the iridium oxide phase and the direction of crystal growth. Epitaxial growth of crystalline IrO 2 is achieved on the isostructural support material SnO 2 , both of which have a rutile structure with very similar lattice constants. Crystallization of amorphous IrO x on an SnO 2 substrate results in interconnected, ultrasmall IrO 2 crystallites that grow along the surface and are firmly anchored to the substrate. Thereby, the IrO 2 phase enables excellent conductivity and remarkable stability of the catalyst at higher overpotentials and current densities at a very low Ir content of only 14 at%. The chemical epitaxy described here opens new horizons for the optimization of conductivity, activity and stability of electrocatalysts and the development of other epitaxial materials systems.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1002/smll.202404118
- https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/smll.202404118
- OA Status
- hybrid
- Cited By
- 10
- References
- 63
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4401728758
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https://openalex.org/W4401728758Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1002/smll.202404118Digital Object Identifier
- Title
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Chemical Epitaxy of Iridium Oxide on Tin Oxide Enhances Stability of Supported OER CatalystWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2024Year of publication
- Publication date
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2024-08-21Full publication date if available
- Authors
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Melisande Kost, Matthias Kornherr, Peter M. Zehetmaier, Hannah Illner, D.S. Jeon, Hubert A. Gasteiger, Markus Döblinger, Dina Fattakhova‐Rohlfing, Thomas BeinList of authors in order
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https://doi.org/10.1002/smll.202404118Publisher landing page
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https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/smll.202404118Direct link to full text PDF
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YesWhether a free full text is available
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hybridOpen access status per OpenAlex
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https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/smll.202404118Direct OA link when available
- Concepts
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Iridium, Oxide, Materials science, Catalysis, Epitaxy, Crystallization, Chemical engineering, Inorganic chemistry, Metal, Tin oxide, Nanotechnology, Chemistry, Layer (electronics), Metallurgy, Organic chemistry, EngineeringTop concepts (fields/topics) attached by OpenAlex
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10Total citation count in OpenAlex
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2025: 8, 2024: 2Per-year citation counts (last 5 years)
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63Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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