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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