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A Comparison of Electrochemical Performance of Double Perovskite REBaCo2O5+x Cathodes in Symmetrical Solid Oxide Fuel Cells

Published online by Cambridge University Press:  01 February 2011

Wenquan Gong ,
Manoj Yadav  and
Allan J. Jacobson
Wenquan Gong
Affiliation:
wenquang.gong@mail.uh.edu, University of Houston, Chemistry, Houston, Texas, United States
Manoj Yadav
Affiliation:
manoj.yadav@yahoo.com, University of Houston, Chemistry, Houston, Texas, United States
Allan J. Jacobson
Affiliation:
ajjacob@uh.edu, University of Houston, Chemistry, Houston, Texas, United States
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Abstract

The segregated vacancies in the A site-ordered oxygen-deficient double perovskites REBaCo2O5+x (RE = La, Pr, Nd, Sm, Eu) (RBCO) are thought to greatly enhance the diffusivity of oxide ions in the bulk of these materials and possibly supply surface defect sites with enhanced reactivity towards molecular oxygen. Some materials in this family of REBaCo2O5+x compounds, such as PrBaCo2O5+x, (PBCO), have already demonstrated high electronic conductivity, rapid oxygen ion diffusion and surface exchange kinetics. Therefore, the family of REBaCo2O5+x compounds were synthesized and evaluated as cathode materials for intermediate temperature solid oxide fuel cells (SOFCs) based on gadolinium doped ceria (CGO) electrolytes. The electrochemical performance of symmetrical cells (REBaCo2O5+x + CGO composite cathodes on the CGO electrolytes) was evaluated by using AC impedance spectroscopy. The area specific resistance (ASR) performance was measured as a function of temperature as well as oxygen partial pressure.

Keywords

energy generationlanthanidediffusion
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1126: Symposium S – Solid-State Ionics–2008 , 2008 , 1126-S08-07
Copyright
Copyright © Materials Research Society 2009

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