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Kim, Guntae
GUNS Lab
Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, metal-air batteries, ceramic membranes, PEMFC

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Impedance studies of dense polycrystalline thin films of La 2NiO4+δ

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Title
Impedance studies of dense polycrystalline thin films of La 2NiO4+δ
Author
Kim, GuntaeWang, ShuangyanJacobson, Allan J.Yuan, ZhengChen, Chonglin
Keywords
TRANSPORT-PROPERTIES; IONIC TRANSPORT; OXYGEN; KINETICS; CONDUCTIVITY; ELECTRODES; DIFFUSION; EXCHANGE; OXIDES; MASS
Issue Date
2007
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY, v.17, no.13, pp.1316 - 1320
Abstract
The cathodic kinetics of 3000 A thick La2NiO 4+δ (LNO) films were studied using AC impedance spectroscopy at 400-620 °C and in 0.01-1.0 atm O2. The dense polycrystalline LNO films were deposited on both sides of yttrium stabilized zirconia (YSZ) (100) single crystal substrates by pulsed laser deposition (PLD). Three distinct features were observed in their AC impedance spectra. The high frequency (HF) feature is assigned to the oxygen ion conduction of the YSZ electrolyte, the medium frequency (MF) feature to the interfacial resistance between the film and the electrolyte, and the low frequency (LF) feature to the oxygen reduction reaction at the film surface. For the LNO film, we conclude that the electrode reaction is limited by the surface exchange reaction. The surface exchange coefficient, ki, is calculated from the LF resistance. The values of ki agree well with those obtained previously for a ceramic sample.
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DOI
http://dx.doi.org/10.1039/b616101d
ISSN
0959-9428
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