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Morphology and electrochemical activity of SOFC composite electrodes: I. experimental analysis

机译：SOFC复合电极的形貌和电化学活性：I。实验分析

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This paper describes the first part of an exper- imental and theoretical study performed on composite Lanthanum Strontium Manganite (LSM) and Yttria-stabi- lized Zirconia (YSZ) electrodes. Cathode electrocatalytic activity was investigated using different cell configurations and carrying out potentiodynamic polarisation and elec- trochemical impedance spectroscopy measurements (EIS). Measurements were carried out at different oxygen partial pressures, overpotentials, temperatures and electrode geometries. In order to identify the main steps involved in cathodic oxygen reduction, the NLLS-Fit procedure was used. The results for different cell geometries agree with each other, suggesting a transition in the overall reaction mechanism, from charge transfer to mass transfer control, at a critical temperature of about 750 °C. The experimental results also show a remarkable effect of electrode thickness on the overall reaction rate, throughout the temperature range tested. A grey level gradient along the thickness of the thicker electrodes were detected by analyzing micro- scopic images of the cells. These results, together with electrochemical measurements on cathodes with different thickness, confirm that morphology plays a key role in determining the performance of Solid Oxide Fuel Cells (SOFC) composite cathodes.
机译：本文介绍了对镧锶锰锰合金（LSM）和氧化钇稳定的氧化锆（YSZ）复合电极进行的实验和理论研究的第一部分。使用不同的电池配置并进行了电位动力学极化和电化学阻抗谱测量（EIS），研究了阴极的电催化活性。在不同的氧气分压，超电势，温度和电极几何形状下进行测量。为了确定涉及阴极氧还原的主要步骤，使用了NLLS-Fit程序。不同细胞几何结构的结果彼此吻合，表明在约750°C的临界温度下，整个反应机理从电荷转移到质量转移控制发生了转变。实验结果还表明，在整个测试温度范围内，电极厚度对总反应速率有显着影响。通过分析细胞的显微图像，可以检测出沿较厚电极厚度的灰度梯度。这些结果，再加上对不同厚度阴极的电化学测量，证实了形态在确定固体氧化物燃料电池（SOFC）复合阴极性能方面起着关键作用。

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