Functional Role of Fe-Doping in Co-Based Perovskite Oxide Catalysts for Oxygen Evolution Reaction

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

DOI

  • Author: Kim, Bae-Jung

    Paul Scherrer Institute, Switzerland

  • Author: Fabbri, Emiliana

    Paul Scherrer Institute, Switzerland

  • Author: Abbott, Daniel F.

    Paul Scherrer Institute, Switzerland

  • Author: Cheng, Xi

    Paul Scherrer Institute, Switzerland

  • Author: Clark, Adam H

    Paul Scherrer Institute

  • Author: Nachtegaal, Maarten

    Paul Scherrer Institute, Switzerland

  • Author: Borlaf, Mario

    Swiss Federal Laboratories for Materials Science and Technology (Empa), Switzerland

  • Author: Castelli, Ivano E.

    Atomic Scale Materials Modelling, Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, 2800, Kgs. Lyngby, Denmark

  • Author: Graule, Thomas

    Swiss Federal Laboratories for Materials Science and Technology (Empa), Switzerland

  • Author: Schmidt, Thomas J.

    Paul Scherrer Institute, Switzerland

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Perovskite oxides have been at the forefront among catalysts for the oxygen evolution reaction (OER) in alkaline media offering a higher degree of freedom in cation arrangement. Several highly OER active Co-based perovskites have been known to show extraordinary activities and stabilities when the B-site is partially occupied by Fe. At the current stage, the role of Fe in enhancing the OER activity and stability is still unclear. In order to elucidate the roles of Co and Fe in the OER mechanism of cubic perovskites, two prospective perovskite oxides, La0.2Sr0.8Co1- xFexO3-δ and Ba0.5Sr0.5Co1-xFexO3-δ with x = 0 and 0.2, were prepared by flame spray synthesis as nanoparticles. This study highlights the importance of Fe in order to achieve high OER activity and stability by drawing relations between their physicochemical and electrochemical properties. Ex situ and operando X-ray absorption spectroscopy (XAS) was used to study the local electronic and geometric structure under oxygen evolving conditions. In parallel, density function theory computational studies were conducted to provide theoretical insights into our findings. Our findings show that the incorporation of Fe into Co-based perovskite oxides alters intrinsic properties rendering efficient OER activity and prolonged stability.
Original languageEnglish
JournalJournal of the American Chemical Society
Volume141
Issue number13
Pages (from-to)5231-5240
ISSN0002-7863
DOIs
Publication statusPublished - 3 Apr 2019
CitationsWeb of Science® Times Cited: No match on DOI
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