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Near-Ambient Pressure XPS of High-Temperature Surface Chemistry in Sr2Co2O5 Thin Films

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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 Sr2Co2O5 (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 La0.8Sr0.2CoO3−δ thin films by SCO surface particles observed previously.

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Acknowledgments

We give many thanks to Andrey Shavorskiy and Hendrik Bluhm for assistance with NAP-XPS measurements. This work was supported in part by the MRSEC Program of the National Science Foundation under award number DMR-0819762 and the Skoltech-MIT Center for Electrochemical Energy. The Advanced Light Source was supported by the Director, Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy under Contracts DE-AC02-06CH11357 and DE-AC02-05CH11231, respectively. The synthesis work at ORNL was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. K.A.S. acknowledges support by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1122374.

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    Authors and Affiliations

    1. Department of Materials Science Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA

      Wesley T. Hong, Kelsey A. Stoerzinger & Yang Shao-Horn

    2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

      Ethan J. Crumlin

    3. BASF SE, Ludwigshafen am Rhein, Germany

      Eva Mutoro

    4. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

      Hyoungjeen Jeen & Ho Nyung Lee

    5. Department of Physics, Pusan National University, Busan, Korea

      Hyoungjeen Jeen

    6. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA

      Yang Shao-Horn

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    1. Wesley T. Hong
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    Correspondence to Yang Shao-Horn.

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    Wesley T. Hong and Kelsey A. Stoerzinger have contributed equally to this manuscript.

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    Hong, W.T., Stoerzinger, K.A., Crumlin, E.J. et al. Near-Ambient Pressure XPS of High-Temperature Surface Chemistry in Sr2Co2O5 Thin Films. Top Catal 59, 574–582 (2016). https://doi.org/10.1007/s11244-015-0532-4

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    • DOI: https://doi.org/10.1007/s11244-015-0532-4

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