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Sr-Diffusion in Ce0.8Gd0.2O2-δ Layers for SOFC Application

Published online by Cambridge University Press:  20 May 2013

Tabea Mandt ,
Carsten Korte ,
Uwe Breuer ,
Alexander Weber ,
Mirko Ziegner ,
Sven Uhlenbruck ,
Norbert Menzler  and
Detlef Stolten
Tabea Mandt
Affiliation:
Institut of Energy and Climate Research, IEK-3: Electrochemical Process Engineering; Forschungszentrum Jülich GmbH, Leo-Brandt Straße 1, 52425 Jülich, Germany
Carsten Korte
Affiliation:
Institut of Energy and Climate Research, IEK-3: Electrochemical Process Engineering; Forschungszentrum Jülich GmbH, Leo-Brandt Straße 1, 52425 Jülich, Germany
Uwe Breuer
Affiliation:
ZEA-3: Central Institute of Analytics; Forschungszentrum Jülich GmbH, Leo-Brandt Straße 1, 52425 Jülich, Germany
Alexander Weber
Affiliation:
Jülich Centre for Neutron Science JCNS / Peter Grünberg Institute PGI, JCNS-2/PGI-4: Scattering Methods; Forschungszentrum Jülich GmbH, Leo-Brandt Straße 1, 52425 Jülich, Germany
Mirko Ziegner
Affiliation:
IEK-2: Material Structure and Properties; Forschungszentrum Jülich GmbH, Leo-Brandt Straße 1, 52425 Jülich, Germany
Sven Uhlenbruck
Affiliation:
IEK-1: Material Synthesis and Manufacturing Processing; Forschungszentrum Jülich GmbH, Leo-Brandt Straße 1, 52425 Jülich, Germany
Norbert Menzler
Affiliation:
IEK-1: Material Synthesis and Manufacturing Processing; Forschungszentrum Jülich GmbH, Leo-Brandt Straße 1, 52425 Jülich, Germany
Detlef Stolten
Affiliation:
Institut of Energy and Climate Research, IEK-3: Electrochemical Process Engineering; Forschungszentrum Jülich GmbH, Leo-Brandt Straße 1, 52425 Jülich, Germany
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Abstract

In this study Sr2+ diffusion along Ce0.8Gd0.2O2-δ (CGO) grain boundaries is investigated. Model samples with different grain boundary densities were prepared by different thin film tech-niques. Diffusion experiments were performed by annealing and subsequent ToF-SIMS analysis. The activation energy of grain boundary diffusion is determined as 492 kJ/mol, which is 2/3 of the bulk diffusion activation energy 739 kJ/mol, deduced from literature data [1-5].

The formation of an electrical blocking SrZrO3 layer due to grain boundary diffusion of Sr2+ through a CGO barrier layer may limit the long term stability of Solid Oxide Fuel Cells based on Zr0.85Y0.15O2-δ electrolytes and La0.58Sr0.4Co0.2Fe0.8O3-δ cathodes. The grain boundary diffusivity and the CGO grain boundary density highly influence the kinetic of the SrZrO3 formation. Aim of this study is to gain data for a prediction of the maximum lifetime of a SOFC system, limited by the increasing cell resistivity due to SrZrO3 formation. Specifications for the CGO barrier layer preparation concerning grain boundary density are determined.

Keywords

barrier layerdiffusionenergy generation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1542: Symposium G – Electrochemical Interfaces for Energy Storage and Conversion— Fundamental Insights from Experiments to Computations , 2013 , mrss13-1542-g11-05
Copyright
Copyright © Materials Research Society 2013 

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References

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