Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 5, Issue 3, Pages 6081-6088Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ee03397f
Keywords
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Funding
- DOE (SISGR) [DE-SC0002633]
- King Abdullah University of Science and Technology
- German Research Foundation (DFG)
- King Fahd University of Petroleum and Minerals in Dharam, Saudi Arabia
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0001284]
- U.S. Department of Energy (DOE) [DE-SC0001284] Funding Source: U.S. Department of Energy (DOE)
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Perovskite oxides have high catalytic activities for oxygen electrocatalysis competitive to platinum at elevated temperatures. However, little is known about the oxide surface chemistry that influences the activity near ambient oxygen partial pressures, which hampers the design of highly active catalysts for many clean-energy technologies such as solid oxide fuel cells. Using in situ synchrotron-based, ambient pressure X-ray photoelectron spectroscopy to study the surface chemistry changes, we show that the coverage of surface secondary phases on a (001)-oriented La0.8Sr0.2CoO3-delta (LSC) film becomes smaller than that on an LSC powder pellet at elevated temperatures. In addition, strontium (Sr) in the perovskite structure enriches towards the film surface in contrast to the pellet having no detectable changes with increasing temperature. We propose that the ability to reduce surface secondary phases and develop Sr-enriched perovskite surfaces of the LSC film contributes to its enhanced activity for O-2 electrocatalysis relative to LSC powder-based electrodes.
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