Long-Term Stability of Composite Cathode at High Current Densities

被引：2

作者：

Kusnezoff, M. ^{[1
]}

Trofimenko, N. ^{[1
]}

Mosch, S. ^{[1
]}

Beckert, W. ^{[1
]}

Graff, A.

Altmann, F.

机构：

[1] Fraunhofer Inst Ceram Technol & Syst, D-01277 Dresden, Germany

来源：

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2 | 2007年 / 7卷 / 01期

关键词：

D O I：

10.1149/1.2729199

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The durability tests were carried out on substrate supported cells based on yttria and scandia stabilized zirconia(YSZ and ScSZ) with conventional A-site deficient lanthanum strontium manganite(uLSM)/YSZ and Ni/YSZ electrodes. The cells were operated at 850 degrees C in air/H-2:H2O (1:1) for more than 1000 h at current densities >450 mA/cm(2). The reduction of the cathode polarization resistance is observed from the analysis of the impedance spectra. Microstructure investigations of the composite cathode using FESEM and TEM revealed that the composite cathode undergoes morphology changes during the first 200-500h of the operation creating some nano-porosity at the uLSM/YSZ interface. Furthermore it was found that the change of the microstructure is strongly affected by the magnitude of the current density. The depth of the electrochemically structured zone as well as the change of the uLSM-composition at the uLSM/YSZ-interface was investigated using transmission electron microscopy.

引用

页码：1033 / 1040

页数：8

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