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Updated: May 9, 2026
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Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
Published on: September 20, 2012
Extraction of quantitative parameters for describing the microstructure of solid oxide fuel cells
Seung-Muk Bae1, Yong-Hoon Kim, Yil-Hwan You
1Department of Materials Science and Engineering, Hongik University 72-1 Sangsu-Dong, Mapo-Gu, Seoul 121-791, Korea.
Summary
This study quantifies microstructures in gadolinium-doped ceria (GDC)/lanthanum strontium manganite (LSM) composite cathodes for solid oxide fuel cells. Results show GDC/LSM interconnectivity varies with composition, crucial for optimizing cathode performance.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Solid oxide fuel cells (SOFCs) require optimized cathode materials for efficient performance.
- Gadolinium-doped ceria (GDC) and lanthanum strontium manganite (LSM) are key components in SOFC cathodes.
- Understanding the microstructure of GDC/LSM composites is vital for enhancing electrochemical properties.
Purpose of the Study:
- To digitally quantify the two-dimensional microstructure of GDC/LSM composite cathodes.
- To determine the relationship between composite composition and microstructural factors like volume fraction, size distribution, and interconnectivity.
- To provide insights for designing improved SOFC cathode materials.
Main Methods:
- Application of digital quantification techniques to GDC/LSM composite structures.
- Utilizing high-resolution secondary and backscattered electron imaging.
- Employing image processing tools with the line intercept method for binary file conversion.
- Performing statistical and metallurgical analysis to extract microstructural parameters.
Main Results:
- The volume fractions of GDC and LSM phases show a clear dependence on the composite composition.
- Interconnectivity of LSM within the composite cathode increases with higher LSM content.
- Interconnectivity of GDC decreases significantly when LSM content reaches 50 wt%.
Conclusions:
- Digital quantification provides valuable microstructural data for GDC/LSM SOFC cathodes.
- The observed trends in volume fraction and interconnectivity offer a basis for material optimization.
- Tailoring the GDC/LSM composition can significantly influence cathode performance through microstructural control.
