National Synchrotron Light Source Seminar

"Measurements of solid oxide fuel cell electrode microstructure and correlation with electrochemical performance and degradation"

Presented by Scott Barnett, Northwestern University

Monday, January 9, 2012, 11:00 am — Seminar Room, Bldg. 725

Quantitative analysis of solid oxide fuel cell (SOFC) electrode microstructure is a key element in connecting materials processing with microstructure and electrode performance, as well as understanding degradation mechanisms. This paper will describe the application of focused ion beam – scanning electron microscopy (FIB-SEM) for analyzing electrodes using both two-dimensional images and three-dimensional image reconstruction. The analysis yields a number of structural parameters needed for use in electrochemical models, including solid and pore volume fractions, interface areas, three-phase boundary lengths, connectivities, and tortuosities. The discussion will focus on the widely-used SOFC electrodes Ni-YSZ and LSM-YSZ (YSZ = Y-stabilized Zirconia; LSM = (La,Sr)MnO3). The effect of varying the volume fractions of the electronically-conducting and ionically-conducting phases will be described. Effects of varying the firing temperature of LSM-YSZ will be described. Initial results on the time evolution of Ni-YSZ structure will be discussed.

Hosted by: Jun Wang

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