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Phase- and Surface Composition-Dependent Electrochemical Stability of Ir-Ru Nanoparticles during Oxygen Evolution Reaction

Escalera-López, Daniel; Czioska, Steffen 1; Geppert, Janis ORCID iD icon 2; Boubnov, Alexey 1,3; Röse, Philipp ORCID iD icon 2; Saraçi, Erisa 1,3; Krewer, Ulrike ORCID iD icon 2; Grunwaldt, Jan-Dierk ORCID iD icon 1,3; Cherevko, Serhiy
1 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)
2 Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST), Karlsruher Institut für Technologie (KIT)
3 Institut für Katalyseforschung und -technologie (IKFT), Karlsruher Institut für Technologie (KIT)


The increasing scarcity of iridium (Ir) and its rutile-type oxide (IrO$_{2}$), the current state-of-the-art oxygen evolution reaction (OER) catalysts, is driving the transition toward the use of mixed Ir oxides with a highly active yet inexpensive metal (Ir$_{x}$M$_{1-x}$O$_{2}$). Ruthenium (Ru) has been commonly employed due to its high OER activity although its electrochemical stability in Ir-Ru mixed oxide nanoparticles (Ir$_{x}$Ru$_{1-x}$O$_{2}$ NPs), especially at high relative contents, is rarely evaluated for long-term application as water electrolyzers. In this work, we bridge the knowledge gap by performing a thorough study on the composition- and phase-dependent stability of well-defined Ir$_{x}$Ru$_{1-x}$O$_{2}$ NPs prepared by flame spray pyrolysis under dynamic operating conditions. As-prepared NPs (Ir$_{x}$Ru$_{1-x}$O$_{y}$) present an amorphous coral-like structure with a hydrous Ir-Ru oxide phase, which upon post-synthetic thermal treatment fully converts to a rutile-type structure followed by a selective Ir enrichment at the NP topmost surface. It was demonstrated that Ir incorporation into a RuO$_{2}$ matrix drastically reduced Ru dissolution by ca. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000135459
Veröffentlicht am 25.11.2021
DOI: 10.1021/acscatal.1c01682
Zitationen: 79
Zitationen: 84
Cover der Publikation
Zugehörige Institution(en) am KIT Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST)
Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1)
Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2155-5435, 2155-5435
KITopen-ID: 1000135459
HGF-Programm 38.03.02 (POF IV, LK 01) Power-based Fuels and Chemicals
Erschienen in ACS catalysis
Verlag American Chemical Society (ACS)
Band 11
Heft 15
Seiten 9300–9316
Projektinformation SPP 2080; DynaKat-OER (DFG, DFG KOORD, GR 3987/15-1)
Vorab online veröffentlicht am 12.07.2021
Schlagwörter electrocatalysis, iridium, oxide, stability, oxygen evolution, composition, ICP-MS
Nachgewiesen in Dimensions
Web of Science
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