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), 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.