J. Fleig, P. Pham, P. Sztulzaft, J. Maier:
"Inhomogeneous current distributions at grain boundaries and electrodes and their impact on the impedance";
Solid State Ionics, 113-115 (1998), S. 739 - 747.

Kurzfassung englisch:
By using the finite element method two cases are treated for which inhomogeneous current distributions and their frequency dependence is of crucial importance: (i) the impedance of different microstructures is calculated and compared with the brick layer model; (ii) the interplay of current constriction at the three-phase boundary and the electrode polarization of porous gas electrodes as used in solid oxide fuel cells (SOFC) is investigated. The impact for a quantitative equivalent circuit analysis is discussed.

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