Modeling the in Situ Ionic and Electronic Conductivity of the Porous Electrodes Linked to the Oxidation-Reduction Reactions in Solid Oxide Fuel Cells

Monday, 2 October 2017: 15:00
National Harbor 4 (Gaylord National Resort and Convention Center)
T. L. Cheng (National Energy Technology Laboratory, AECOM, P.O. Box 1959, Albany, OR, 97321, USA), Y. Lei (National Energy Technology Laboratory), and Y. H. Wen (U.S. Department of Energy - NETL)
The ionic conductivity is essential to the performance of a solid oxide fuel cell (SOFC). While the effective conductivity of a porous electrode is frequently involved in SOFC models, the concept of the real (in situ) conductivity in a working electrode is yet to be clarified. To model the in situ ionic and electronic conductivity, the microstructure/geometry and the associated spatial property distribution, as well as the chemical reactions have to be explicitly considered. Here we present a theoretical framework together with phase field modeling to approach this issue. In addition, a recently developed spectral method is used to solve the transport problem in media with complex microstructure.