Fuel Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Department of Mechanical & Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Molecules. 2022 Apr 14;27(8):2549. doi: 10.3390/molecules27082549.
Cathode thickness plays a major role in establishing an active area for an oxygen reduction reaction in energy converter devices, such as solid oxide fuel cells. In this work, we prepared SrFeTiO-CeSmO composite cathodes with different layers (1×, 3×, 5×, 7×, and 9× layer). The microstructural and electrochemical performance of each cell was then explored through scanning electron microscopy and electrochemical impedance spectroscopy (EIS). EIS analysis showed that the area-specific resistance (ASR) decreased from 0.65 Ωcm to 0.12 Ωcm with the increase in the number of layers from a 1× to a 7×. However, the ASR started to slightly increase at the 9× layer to 2.95 Ωcm due to a higher loss of electrode polarization resulting from insufficient gas diffusion and transport. Therefore, increasing the number of cathode layers could increase the performance of the cathode by enlarging the active area for the reaction up to the threshold point.
在能量转换设备（如固体氧化物燃料电池）中，阴极厚度对于建立氧还原反应的活性区域起着重要作用。在这项工作中，我们制备了具有不同层数（1×、3×、5×、7×和 9×层）的 SrFeTiO-CeSmO 复合阴极。然后通过扫描电子显微镜和电化学阻抗谱（EIS）研究了每个电池的微观结构和电化学性能。EIS 分析表明，随着层数从 1×增加到 7×，比表面积电阻（ASR）从 0.65 Ωcm 降低到 0.12 Ωcm。然而，在 9×层，ASR 开始略微增加到 2.95 Ωcm，这是由于电极极化损耗增加，导致气体扩散和传输不足。因此，通过增加阴极层的数量，可以通过扩大反应的活性区域来提高阴极的性能，直到达到阈值点。
