Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Influence of Porous Cathode Microstructure on Overpotential Characteristics of Solid Oxide Fuel Cells

Get access (open in a dialog) DOI: 10.1615/IHTC15.pmd.009617
pages 6803-6811

Abstrakt

This paper demonstrates the microstructure-performance relationships in the lanthanum strontium manganite (LSM) cathodes used for solid oxide fuel cells (SOFCs). Three-dimensional microstructure of LSM cathodes is directly imaged using focused ion beam scanning electron microscopy (FIB-SEM) to obtain microstructural information such as tortuosity factor, triple-phase boundary (TPB) density and particle/pore size. The effect of the cathode microstructure on the performance is experimentally investigated using cathodes with different microstructures. Numerical simulation of the cathodes is also carried out by applying the obtained structural information in order to discuss further details of the phenomena in the porous cathodes. The numerical results successfully reproduce the overpotential characteristics observed in the experiment. The relationships between the obtained microstructural information and the electrochemical performance of the cathodes are discussed and guidelines for optimizing the cathode microstructure are proposed.