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          Institute: MPI für bioanorganische Chemie     Collection: MPI für bioanorganische Chemie     Display Documents

ID: 733904.0, MPI für bioanorganische Chemie / MPI für bioanorganische Chemie
High-Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts
Authors:Massue, Cyriac; Pfeifer, Verena; Huang, Xing; Noack, Johannes; Tarasov, Andrey; Cap, Sebastien; Schlögl, Robert
Date of Publication (YYYY-MM-DD):2017
Title of Journal:ChemSusChem
Journal Abbrev.:ChemSusChem
Issue / Number:9
Start Page:1943
End Page:1957
Review Status:Internal review
Audience:Experts Only
Abstract / Description: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 Ir-III/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 20g(Ir)cm(-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 Ir-III/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.
Comment of the Author/Creator:Date: 2017, MAY 9 2017
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:N. N.
Affiliations:MPI für bioanorganische Chemie
Identifiers:ISI:000401165900011 [ID No:1]
ISSN:1864-5631 [ID No:2]
DOI:10.1002/cssc.201601817 [ID No:3]
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