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Early interaction between Fe–Cr alloy metallic interconnect and Sr-doped LaMnO3 cathodes of solid oxide fuel cells

Published online by Cambridge University Press:  01 March 2005

S.P. Jiang ,
Sam Zhang  and
Y.D. Zhen
S.P. Jiang*
Affiliation:
Fuel Cells Strategic Research Program, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
Sam Zhang
Affiliation:
Fuel Cells Strategic Research Program, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
Y.D. Zhen
Affiliation:
Fuel Cells Strategic Research Program, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
*
a) Address all correspondence to this author. e-mail: mspjiang@ntu.edu.sg
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Abstract

The initial stages of the interaction between the Fe–Cr alloy metallic interconnect and Sr-doped LaMnO3 (LSM) electrode of solid oxide fuel cells (SOFC) were investigated under cathodic polarization at the temperature range of 700–900 °C. Cr deposits on the Y2O3–ZrO2 (YSZ) electrolyte surface increased with the polarization time. However, it was observed that at the early stages of the reaction, there is no preferential Cr deposition at the three-phase boundary areas at the LSM electrode/YSZ electrolyte interface region. With the decrease of the temperature the Cr deposition reduced significantly, probably due to the significant reduction in the partial pressure of the gaseous Cr species and the cationic diffusivities in the LSM electrode. The results clearly demonstrated that the deposition of Cr species at the LSM electrode/YSZ electrolyte is basically a chemical reaction and kinetically controlled by the nucleation reaction between the gaseous Cr species and the Mn2+ species generated under cathodic polarization.

Keywords

AlloyCoatingScanning electron microscopy (SEM)
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 3 , March 2005 , pp. 747 - 758
Copyright
Copyright © Materials Research Society 2005

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