Chemically Driven Enhancement of Oxygen Reduction Electrocatalysis in Supported Perovskite Oxides

Daehee Lee, Jeiwan Tan, Keun Hwa Chae, Beomgyun Jeong, Aloysius Soon, Sung Jin Ahn, Joosun Kim, Jooho Moon

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3 Citations (Scopus)

Abstract

Perovskite oxides have the capacity to efficiently catalyze the oxygen reduction reaction (ORR), which is of fundamental importance for electrochemical energy conversion. While the perovskite catalysts have been generally utilized with a support, the role of the supports, regarded as inert toward the ORR, has been emphasized mostly in terms of the thermal stability of the catalyst system and as an ancillary transport channel for oxygen ions during the ORR. We demonstrate a novel approach to improving the catalytic activity of perovskite oxides for solid oxide fuel cells by controlling the oxygen-ion conducting oxide supports. Catalytic activities of (La0.8Sr0.2)0.95MnO3 perovskite thin-film placed on different oxide supports are characterized by electrochemical impedance spectroscopy and X-ray absorption spectroscopy. These analyses confirm that the strong atomic orbital interactions between the support and the perovskite catalyst enhance the surface exchange kinetics by ∼2.4 times, in turn, improving the overall ORR activity.

Original languageEnglish
Pages (from-to)235-242
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume8
Issue number1
DOIs
Publication statusPublished - 2017 Jan 5

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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