Microstructure and Polarization characteristics of LSCF-GDC Composite Cathode with Different Volume Fractions

Monday, 27 July 2015
Hall 2 (Scottish Exhibition and Conference Centre)
Y. T. Kim, A. Ohi, A. He, Z. Jiao, T. Shimura (Institute of Industrial Science, The University of Tokyo), D. Klotz (Karlsruhe Institute of Technology), S. Hara, and N. Shikazono (Institute of Industrial Science, The University of Tokyo)
In the present study, La0.6Sr0.4Co0.2Fe0.8O3(LSCF)-Gd0.1Ce0.9O1.95(GDC) composite cathodes with different volume fractions were fabricated by the screen printing method, and their polarization characteristic and microstructure parameters are evaluated. Cathode overpotentials were evaluated at 700 oC and 100% O2. Microstructures were reconstructed by focused ion beam-scanning electron microscope (FIB-SEM). In addition, current and potential distributions inside the reconstructed microstructures were calculated by a Lattice Boltzmann method. The relationship between polarization characteristics and microstructure is quantitatively investigated.