Evaluation and modeling of the cell resistance in anode-supported solid oxide fuel cells

被引：547

作者：

Leonide, A. ^{[1
]}

Sonn, V. ^{[1
]}

Weber, A. ^{[1
]}

Ivers-Tiffee, E. ^{[1
]}

机构：

[1] Univ Karlsruhe, Inst Werkstoffe Elek, Karlsruhe, Germany

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2008年 / 155卷 / 01期

关键词：

D O I：

10.1149/1.2801372

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The impedance of anode-supported single cells [Ni/8 yttria-stabilized zirconia (YSZ) anode; La0.58Sr0.4Co0.2Fe0.8O3-delta cathode; 8YSZ electrolyte; area 1 cm(2)] was characterized in a broad measuring range of temperature and air/fuel gas composition. The data has been analyzed by calculating the distribution function of relaxation times (DRTs). DRT computations enabled us to separate five different loss mechanisms occurring inside the cathode and anode without the need of an equivalent circuit. Two processes exhibit a systematic dependency on changes in the oxygen partial pressure of the cathode gas and thus can be attributed to diffusional and electrochemical losses on the cathode side. The remaining three processes are very sensitive to changes in the fuel gas but are not affected by variations of the cathode gas. These resistances are classified as a gas diffusion polarization within the anode-substrate and as an electro-oxidation reaction at the triple-phase boundary, respectively. (c) 2007 The Electrochemical Society.

引用

页码：B36 / B41

页数：6

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