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

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

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-δ (LSC) films were investigated by using in situ depth-re...

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Veröffentlicht in:ECS electrochemistry letters 2014-02, Vol.3 (4), p.F23-F26
Hauptverfasser: Orikasa, Yuki, Crumlin, Ethan J., Sako, Shinnosuke, Amezawa, Koji, Uruga, Tomoya, Biegalski, Michael D., Christen, Hans M., Uchimoto, Yoshiharu, Shao-Horn, Yang
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container_issue 4
container_start_page F23
container_title ECS electrochemistry letters
container_volume 3
creator Orikasa, Yuki
Crumlin, Ethan J.
Sako, Shinnosuke
Amezawa, Koji
Uruga, Tomoya
Biegalski, Michael D.
Christen, Hans M.
Uchimoto, Yoshiharu
Shao-Horn, Yang
description 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-δ (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 ∼ 2 nm, revealed that the surface regions of ∼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.
doi_str_mv 10.1149/2.006404eel
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title Surface Strontium Segregation of Solid Oxide Fuel Cell Cathodes Proved by In Situ Depth-Resolved X-ray Absorption Spectroscopy
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