NDLI: Near-Ambient Pressure XPS of High-Temperature Surface Chemistry in Sr$_{2}$Co$_{2}$O$

Content Provider	Springer Nature Link
Author	Hong, Wesley T. Stoerzinger, Kelsey A. Crumlin, Ethan J. Mutoro, Eva Jeen, Hyoungjeen Lee, Ho Nyung Shao Horn, Yang
Copyright Year	2016
Abstract	Transition metal perovskite oxides are promising electrocatalysts for the oxygen reduction reaction (ORR) in fuel cells, but a lack of fundamental understanding of oxide surfaces impedes the rational design of novel catalysts with improved device efficiencies. In particular, understanding the surface chemistry of oxides is essential for controlling both catalytic activity and long-term stability. Thus, elucidating the physical nature of species on perovskite surfaces and their catalytic enhancement would generate new insights in developing oxide electrocatalysts. In this article, we perform near-ambient pressure XPS of model brownmillerite Sr$_{2}$Co$_{2}$O$_{5}$ (SCO) epitaxial thin films with different crystallographic orientations. Detailed analysis of the Co 2p spectra suggests that the films lose oxygen as a function of temperature. Moreover, deconvolution of the O 1s spectra shows distinct behavior for (114)-oriented SCO films compared to (001)-oriented SCO films, where an additional bulk oxygen species is observed. These findings indicate a change to a perovskite-like oxygen chemistry that occurs more easily in (114) SCO than (001) SCO, likely due to the orientation of oxygen vacancy channels out-of-plane with respect to the film surface. This difference in surface chemistry is responsible for the anisotropy of the oxygen surface exchange coefficient of SCO and may contribute to the enhanced ORR kinetics of La$_{0.8}$Sr$_{0.2}$CoO$_{3−δ }$ thin films by SCO surface particles observed previously.
Starting Page	574
Ending Page	582
Page Count	9
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	59
Issue Number	5-7
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2016-02-11
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ambient pressure XPS Strontium cobaltite Solid oxide fuel cells Oxygen reduction Electrocatalysis Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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