Impedance of solid oxide fuel cell LSM/YSZ composite cathodes
Impedance of solid oxide fuel cell LSM/YSZ composite cathodes
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DOI：
10.1149/1.1360203
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发表时间：
2001-05-01
影响因子：
3.9
通讯作者：
Mogensen, M
中科院分区：
文献类型：
--
作者：
Jorgensen, MJ;Mogensen, M
制备了不同成分和工艺参数的锰酸镧锶/钇稳定氧化锆（LSM/YSZ）复合电极。用阻抗谱法对复合材料进行了研究。从阻抗数据中提取出氧还原过程的一般趋势。综述了LSM/YSZ电极及其相关体系的动力学研究文献，并与新的实验数据进行了比较。由此发现，至少有五个过程影响阻抗。从高频到低频，这些过程是(i), （ii）两个几何相关的贡献，解释为跨LSM/YSZ界面和通过复合材料YSZ的输运，（iii）反映竞争性反应步骤的过程，如键断裂和表面扩散，（iv）电极结构上方停滞气体层中的气体扩散，(v)激活过程（感应）可能位于电极，电解质和气相的三相边界。(C) 2001电化学学会。
A number of lanthanum strontium manganate/yttria-stabilized zirconia (LSM/YSZ) composite electrodes are produced with varying composition and processing parameters. The composites are investigated using impedance spectroscopy. General trends related to the oxygen reduction process are extracted from the impedance data. Literature concerning kinetic studies of LSM/YSZ electrodes and related systems is reviewed and compared to new experimental data. From this it is found that at least five processes affect the impedance. Going from high to low frequency, these processes are (i), (ii) two geometry-related contributions interpreted as transport across LSM/YSZ interfaces and through the YSZ of the composite, (iii) a process reflecting competitive reaction steps such as bond breaking and surface diffusion, (iv) gas diffusion in a stagnant gas layer above the electrode structure, and (v) an activation process (inductive) presumably located at the triple phase boundary of electrode, electrolyte, and gas phase. (C) 2001 The Electrochemical Society.