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The Electrochemical Society, ECS Electrochemistry Letters, 4(3), p. F23-F26

DOI: 10.1149/2.006404eel

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Surface Strontium Segregation of Solid Oxide Fuel Cell Cathodes Proved by In Situ Depth-Resolved X-ray Absorption Spectroscopy

Journal article published in 2014 by Yuki Orikasa, Ethan J. Crumlin, Shinnosuke Sako, Koji Amezawa, Tomoya Uruga, Michael D. Biegalski, Hans M. Christen, Yoshiharu Uchimoto ORCID, Yang Shao-Horn
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Little is known about the structures and chemistry of perovskites, occurring from the surface to the bulk, at high temperatures and ambient oxygen pressures. Changes in the composition and electronic structure of (001)-oriented La0.8Sr0.2CoO3-delta (LSC) films were investigated by using in situ depth-resolved X-ray adsorption (XAS) under practical operating conditions of solid oxide fuel cells. Depth-resolved XAS spectra of LSC films, with a depth resolution of similar to 2 nm, revealed that the surface regions of similar to 10 nm were considerably different from the film bulk. The surface regions were enriched in strontium, which can play an important role in governing the oxygen exchange kinetics at the surface.