Influence of initial powder morphology on polarization characteristics of Nickel/Gadolinium-Doped-Ceria Solid Oxide Fuel Cells electrode
Influence of initial powder morphology on polarization characteristics of Nickel/Gadolinium-Doped-Ceria Solid Oxide Fuel Cells electrode
复制标题
初始粉末形貌对镍/钆掺杂二氧化铈固体氧化物燃料电池电极极化特性的影响
DOI：
10.1149/2.0181902jes
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
N.
中科院分区：
文献类型：
--
作者：
Sciazko;A.;Miyahara;K.;Komatsu;Y.;Shimura;T.;Jiao;Z. and Shikazono;N.
镍-钆掺杂氧化铈（Ni-GDC）复合阳极作为中温固体氧化物燃料电池的一种新型阳极材料受到了广泛的关注。本文研究了Ni-GDC阳极的初始组织对阳极极化特性的影响及其在100 h运行中的劣化情况。所研究的阳极的初始微观结构由GDC粉末的不同尺寸和纵横比确定，但是所有阳极具有相同的初始组成NiO：GDC= 60：40体积%。研究发现，GDC颗粒最小的阳极具有最好的初始性能，但也经历了最严重的降解。采用聚焦离子束扫描电子显微镜（FIB SEM）对阳极的微观结构进行了研究，并对阳极的微观结构参数进行了定量分析。通过实验，讨论了Ni-GDC的微观结构对阳极极化特性的贡献。本文还讨论了手术后的形态演变，特别是GDC期的形态演变。由此得出结论，GDC的迁移率可能是决定极化电阻变化的影响因素。
Nickel-gadolinium doped ceria (Ni-GDC) composite anodes gain a lot of attention as they have potential to be a beneficial solution for the intermediate temperature solid oxide fuel cells. In this paper, the influence of the initial microstructure of Ni-GDC anode on the polarization characteristics and its deterioration in 100h operation are investigated. The initial microstructures of the investigated anodes are determined by the different sizes and aspect ratios of the GDC powders, but all anodes having the same initial compositions of NiO: GDC= 60: 40 vol.%. It was found that the anode with the smallest GDC particle had the best initial performance, but also underwent the most severe degradation. The microstructures of the fabricated anodes were investigated by focused ion beam-scanning electron microscopy (FIB-SEM), and microstructural parameters were quantified to relate the electrochemical performance. From the experimentation, contribution of the Ni-GDC microstructure to the anode polarization characteristics is discussed. The morphological evolution after the operation is also in discussion, especially those of the GDC phase. It was concluded that the mobility of GDC could be an influential factor determining the change in polarization resistance.