Journal
SURFACE SCIENCE
Volume 642, Issue -, Pages 33-38Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2015.08.001
Keywords
XPS; SOFC; Oxygen vacancy; Thin film; Lanthanum strontium cobalt ferrite; Fuel cell cathode
Categories
Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DEAC02-98CH10886]
- U.S. National Science Foundation [CHE-1213381]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1213381] Funding Source: National Science Foundation
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We present a systematic synchrotron radiation photoemission spectroscopy study of the interaction of O-2 with defective La0.8Sr0.2Co0.2Fe0.8O3 - delta(100) surfaces at low temperatures. First, the surface chemical evolution during low energy Ar+ ion sputtering is investigated and is found to create oxygen vacancies. Subsequently, the interaction of the O-2 molecules with La0.8Sr0.2Co0.2Fe0.8O3 - delta(100) surface is observed to create an insulating phase. We performed a detailed core-level peak-fitting analysis to identify the chemical nature of this phase and to probe the role of vacancies in the formation of this phase. (C) 2015 Elsevier B.V. All rights reserved.
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