Near-Ambient Pressure XPS of High-Temperature Surface Chemistry in Sr2Co2O5 Thin Films
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- 作者：Wesley T. Hong ; Kelsey A. Stoerzinger ; Ethan J. Crumlin ; Eva Mutoro…
- 关键词：Ambient pressure XPS ; Strontium cobaltite ; Solid oxide fuel cells ; Oxygen reduction ; Electrocatalysis
- 刊名：Topics in Catalysis
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：59
- 期：5-7
- 页码：574-582
- 全文大小：1,738 KB
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Kelsey A. Stoerzinger (1)
Ethan J. Crumlin (2)
Eva Mutoro (3)
Hyoungjeen Jeen (4) (5)
Ho Nyung Lee (4)
Yang Shao-Horn (1) (6)
1. Department of Materials Science Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
3. BASF SE, Ludwigshafen am Rhein, Germany
4. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
5. Department of Physics, Pusan National University, Busan, Korea
6. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA - 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
- 出版者：Springer US
- ISSN：1572-9028
文摘
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.