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  High-Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts

Massué, C., Pfeifer, V., Huang, X., Noack, J., Tarasov, A., Cap, S., et al. (2017). High-Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts. ChemSusChem, 10(9), 1943-1957. doi:10.1002/cssc.201601817.

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Massué, Cyriac1, 2, Author              
Pfeifer, Verena1, Author              
Huang, Xing1, Author              
Noack, Johannes1, Author              
Tarasov, Andrey1, Author              
Cap, Sébastien1, Author              
Schlögl, Robert1, 2, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Department of Heterogenous Reactions Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34–36, 45470 Melheim-an-der-Ruhr (Germany), ou_persistent22              

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 Abstract: The synthesis of a highly active and yet stable electrocatalyst for the anodic oxygen evolution reaction (OER) remains a major challenge for acidic water splitting on an industrial scale. To address this challenge, we obtained an outstanding high-performance OER catalyst by loading Ir on conductive antimony-doped tin oxide (ATO)-nanoparticles by a microwave (MW)-assisted hydrothermal route. The obtained Ir phase was identified by using XRD as amorphous (XRD-amorphous), highly hydrated IrIII/IV oxohydroxide. To identify chemical and structural features responsible for the high activity and exceptional stability under acidic OER conditions with loadings as low as 20 µgIrcm-2, we used stepwise thermal treatment to gradually alter the XRD-amorphous Ir phase by dehydroxylation and crystallization of IrO2. This resulted in dramatic depletion of OER performance, indicating that the outstanding electrocatalytic properties of the MW-produced IrIII/IV oxohydroxide are prominently linked to the nature of the produced Ir phase. This finding is in contrast with the often reported stable but poor OER performance of crystalline IrO2-based compounds produced through more classical calcination routes. Our investigation demonstrates the immense potential of Ir oxohydroxide- based OER electrocatalysts for stable high-current water electrolysis under acidic conditions.

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Language(s): eng - English
 Dates: 2017-01-272016-12-092017-02-052017-03-30
 Publication Status: Published online
 Pages: 15
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/cssc.201601817
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Title: ChemSusChem
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: 15 Volume / Issue: 10 (9) Sequence Number: - Start / End Page: 1943 - 1957 Identifier: ISSN: 1864-5631
CoNE: https://pure.mpg.de/cone/journals/resource/1864-5631