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Electrochemical Characterization of La2-xPrxNiO4+x for Application as Cathodes in Intermediate Temperature SOFCs

Published online by Cambridge University Press:  26 February 2011

Gun Tae Kim  and
Allan J Jacobson
Gun Tae Kim
Affiliation:
[email protected], University of Houston, Chemistry, 136 Fleming Building, Houston, TX, 77204-5003, United States
Allan J Jacobson
Affiliation:
[email protected], University of Houston, Department of Chemistry, 136 Fleming Bldg., Houston, TX, 77204-5003, United States
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Abstract

The electrochemical properties of perovskite-type materials, Ln2NiO4+δ (Ln = La, Pr) as cathodes on Ce0.9Gd0.1O3 (CGO) and YSZ electrolytes were studied from 400 to 700 °C under different oxygen partial pressures (pO2 = 0.01-1 atm) by using AC impedance spectroscopy. These oxide electrodes yielded lower area specific resistance (ASR) compared to manganite perovskites. Ln2NiO4+δ (Ln = La, Pr) on CGO showed similar electrochemical performance though La2NiO4 (LNO) has a smaller ASR than Pr2NiO4 (PNO). The polarization resistance of LNO on YSZ was 2 orders higher than that on CGO. The interfacial resistance between the electrode and electrolyte was much smaller for LNO on CGO than for LNO on YSZ.

Keywords

oxideelectrical propertiesceramic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA11-04
Copyright
Copyright © Materials Research Society 2007

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