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Extraction of Quantitative Parameters for Describing the Microstructure of Solid Oxide Fuel Cells

Published online by Cambridge University Press:  06 August 2013

Seung-Muk Bae ,
Yong-Hoon Kim ,
Yil-Hwan You  and
Jin-Ha Hwang
Seung-Muk Bae
Affiliation:
Department of Materials Science and Engineering, Hongik University 72-1 Sangsu-Dong, Mapo-Gu, Seoul 121-791, Korea
Yong-Hoon Kim
Affiliation:
Department of Materials Science and Engineering, Hongik University 72-1 Sangsu-Dong, Mapo-Gu, Seoul 121-791, Korea
Yil-Hwan You
Affiliation:
Department of Materials Science and Engineering, Hongik University 72-1 Sangsu-Dong, Mapo-Gu, Seoul 121-791, Korea
Jin-Ha Hwang*
Affiliation:
Department of Materials Science and Engineering, Hongik University 72-1 Sangsu-Dong, Mapo-Gu, Seoul 121-791, Korea
*
*Corresponding author. E-mail: jhwang@wow.hongik.ac.kr
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Abstract

Digital quantification of a two-dimensional structure was applied to a GDC(Gd2O3-doped CeO2)/LSM(La0.85Sr0.15MnO3) composite cathode employed for solid oxide fuel cells. With the aid of high-resolution imaging capability based on secondary and backscattered electron images, two-dimensional electron micrographs were converted to digital binary files using an image processing tool combined with the line intercept method. Statistical analysis combined with a metallurgical tool was employed to determine microstructural factors, i.e., volume fraction, size distribution, and interconnectivity. The current work reports the quantification of the two-dimensional structural images of GDC/LSM composites applicable to solid oxide fuel cells, with the aim of obtaining the volume fraction, size distribution, and interconnectivity as functions of composite composition. The volume fractions of the solid constituent phases exhibit compositional dependence in cathodes; however, LSM interconnectivity increases gradually as a function of LSM composition, whereas that of GDC decreases significantly at 50 wt% LSM.

Keywords

image processingdigital processingmicrostructural factorssolid oxide fuel cellscathodesline intercepts
Type
Research Article
Information
Microscopy and Microanalysis , Volume 19 , Supplement S5: IUMAS , August 2013 , pp. 140 - 144
Copyright
Copyright © Microscopy Society of America 2013 

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