55
Investigation of Electrochemical Reaction Mechanism with LSC-GDC Composite Cathode Based on 3D Reconstructed Microstructures

Monday, 24 July 2017
Grand Ballroom East (The Diplomat Beach Resort)
Y. T. Kim and N. Shikazono (Institute of Industrial Science, The University of Tokyo)
In the present study, electrochemical reaction mechanisms of La0.6Sr0.4CoO3 (LSC)-Gd0.1Ce0.9O1.95 (GDC) composite cathodes were investigated by a Lattice Boltzmann Method (LBM) based on 3D reconstructed cathode microstructures with different volume ratios. In the simulation, the exchange current density for the surface reaction was fitted using an experimental data of pure LSC cathode. On the other hand, the exchange current density for the TPB reaction was fitted using composite cathodes. Overpotentials and potential distributions were quantified. Then, the results were compared with those of LSCF-GDC composites reported in our previous work (Y.T. Kim, Z. Jiao, N. Shikazono, J. Power Sources, 342, pp. 787-795, 2017). LSC surface area density was 1.4 μm2/μm3, which was smaller than the LSCF cathode. Compared with the LSCF-GDC composite cathode, it is considered that TPB reaction is more contributed for the LSC-GDC composite cathodes.