Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 9, Pages 1512-1518Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz400250t
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Funding
- DOE [SISGR DESC0002633]
- King Abdullah University of Science and Technology
- King Fahd University of Petroleum and Minerals in Dharam, Saudi Arabia through the Center for Clean Water and Clean Energy at MIT
- King Fahd University of Petroleum and Minerals in Dharam, Saudi Arabia through the Center for Clean Water and Clean Energy at KFUPM
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-06CH11357, DE-AC02-05CH11231]
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
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Perovskites are used to promote the kinetics of oxygen electrocatalysis in solid oxide fuel cells and oxygen permeation membranes. Little is known about the surface structure and chemistry of perovskites at high temperatures and partial oxygen pressures. Combining in situ X-ray reflectivity (XRR) and in situ ambient pressure X-ray photoelectron spectroscopy (APXPS), we report, for the first time, the evolution of the surface structure and chemistry of (001)-oriented perovskite La0.8Sr0.2CoO3-delta (LSC113) and (La0.5Sr0.5)(2)CoO4+delta (LSC214)-decorated LSC113 (LSC113/214) thin films as a function of temperature. Heating the (001) oriented LSC113 surface leads to the formation of surface LSC214-like particles, which is further confirmed by ex situ Auger electron spectroscopy (AES). In contrast, the LSC113/214 surface, with activities much higher than that of LSC113, is stable upon heating. Combined in situ x RR and AMPS measurements support that Sr enrichment may occur at the LSC113 and LSC214 interface, which can be responsible for its markedly enhanced activities.
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