平板型固体酸化物燃料電池の流路内ガス分圧変動に起因する交流インピーダンスの数値解析

概要

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For research and development of the solid oxide fuel cell (SOFC), it is very important to develop diagnostic tools that can grasp detailed cell performance characteristics. The a.c. impedance analysis is one of the indispensable methods for this purpose. The authors, therefore, perform time-dependent numerical simulations for a planar SOFC, and investigate its a.c. impedance characteristics caused by the variation of fuel gas partial pressure. It is made clear that the fuel gas flow in the SOFC works as a virtual capacitance and the Cole-Cole plot takes a form of almost perfect semicircle. The diameter of the semicircle in the Cole-Cole plot is the equivalent resistance originated in the change of the Nernst potential caused by the current change. In the case of the counter-flow type cell, this diameter is smaller in comparison with the co-flow type cell. The a.c. impedance characteristics also change depending upon the inlet gas temperature.
社団法人電気学会の論文
2006-09-01