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Main Title: IrOx core-shell nanocatalysts for cost- and energy-efficient electrochemical water splitting
Author(s): Nong, Hong Nhan
Gan, Lin
Willinger, Elena
Teschner, Detre
Strasser, Peter
Type: Article
Language Code: en
Abstract: A family of dealloyed metal–oxide hybrid (M1M2@M1Ox) core@shell nanoparticle catalysts is demonstrated to provide substantial advances toward more efficient and less expensive electrolytic water splitting. IrNi@IrOx nanoparticles were synthesized from IrNix precursor alloys through selective surface Ni dealloying and controlled surface oxidation of Ir. Detailed depth-resolved insight into chemical structure, composition, morphology, and oxidation state was obtained using spectroscopic, diffraction, and scanning microscopic techniques (XANES, XRD, STEM-EDX, XPS), which confirmed our structural hypotheses at the outset. A 3-fold catalytic activity enhancement for the electrochemical oxygen evolution reaction (OER) over IrO2 and RuO2 benchmark catalysts was observed for the core-shell catalysts on a noble metal mass basis. Also, the active site-based intrinsic turnover frequency (TOF) was greatly enhanced for the most active IrNi@IrOx catalyst. This study documents the successful use of synthetic dealloying for the preparation of metal-oxide hybrid core-shell catalysts. The concept is quite general, can be applied to other noble metal nanoparticles, and points out a path forward to nanostructured proton-exchange-electrolyzer electrodes with dramatically reduced noble metal content.
Issue Date: 2014
Date Available: 22-Jun-2016
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Sponsor/Funder: DFG, STR 596/3-1, Nanostructured mixed metal oxides for the electrocatalytic oxidation of water
BMBF, 03SF0433A, Verbundvorhaben MEOKATS: Effiziente edelmetallfreie Katalysatorsysteme basierend auf Mangan und Eisen für flexible Meerwasserelektrolyseure
Journal Title: Chemical science
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 5
Issue: 8
Publisher DOI: 10.1039/c4sc01065e
Page Start: 2955
Page End: 2963
EISSN: 2041-6520
Appears in Collections:FG Technische Chemie » Publications

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