NDLI: Enhanced oxygen reduction activity on surface-decorated perovskite thin films for solid oxide fuel cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Christen, Hans M. Shao-Horn, Yang Mutoro, Eva Crumlin, Ethan J. Biegalski, Michael D.
Copyright Year	2011
Abstract	Surface-decoration of perovskites can strongly affect the oxygen reduction activity, and therefore is a new and promising approach to improve SOFC cathode materials. In this study, we demonstrate that a small amount of secondary phase on a (001) La0.8Sr0.2CoO3−δ (LSC) surface can either significantly activate or passivate the electrode. LSC (001) microelectrodes prepared by pulsed laser deposition on a (001)-oriented yttria-stabilized zirconia (YSZ) substrate were decorated with La-, Co-, and Sr-(hydr)oxides/carbonates. “Sr”-decoration with nanoparticle coverage in the range from 50% to 80% of the LSC surface enhanced the surface exchange coefficient, kq, by an order of magnitude while “La”-decoration and “Co”-decoration led to no change and reduction in kq, respectively. Although the physical origin for the enhancement is not fully understood, results from atomic force microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy suggest that the observed kq enhancement for “Sr”-decorated surfaces can be attributed largely to catalytically active interface regions between surface Sr-enriched particles and the LSC surface.
Starting Page	3689
Ending Page	3696
Page Count	8
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	4
Issue Number	9
Journal	Energy & Environmental Science
DOI	10.1039/c1ee01245b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SOFC LSC Oxygen Solid oxide fuel cell Cathode Electrode Pulsed laser deposition Yttria-stabilized zirconia Nanoparticle Atomic-force microscopy X-ray crystallography X-ray photoelectron spectroscopy Photoemission spectroscopy
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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