In-situ diagnosis and assessment of longitudinal current variation by electrode-segmentation method in anode-supported microtubular solid oxide fuel cells
In-situ diagnosis and assessment of longitudinal current variation by electrode-segmentation method in anode-supported microtubular solid oxide fuel cells
复制标题
阳极支撑微管固体氧化物燃料电池中电极分段法纵向电流变化的原位诊断和评估
DOI：
10.1016/j.jpowsour.2014.12.156
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发表时间：
2015
影响因子：
9.2
通讯作者：
Tatsumi Kitahara
中科院分区：
文献类型：
--
作者：
Ozgur Aydin;Takahiro Koshiyama;Hironori Nakajima;Tatsumi Kitahara
固体氧化物燃料电池（SOFC）的电化学性能高度依赖于反应物和产物物种的空间分布。结构退化过程也与空间量有关。事实上，空间测量的电流变化提供了关于局部过程的深刻信息。由于微管SOFC（mt-SOFC）的几何形状，显著的电流变化可沿电池沿着发展并引起温度变化。通过应用电极分段方法，实验研究了阳极支撑的mt-SOFC在不同电池电压和燃料流量下的纵向电流变化。其结果是，一个显着的电流变化之间的段中的各种流量。下游段的电流随着电池电压的下降而迅速减小，这意味着燃料饥饿，而其他段继续增加它们的电流。为整个电池绘制的常规极化曲线与中游极化曲线重叠，与其他部分有很大不同。在相同的H2流量下，较高的N2流量提高了整体性能。在与估计的实际发电容量的整个电池，一个显着的性能损失，发现由于不均匀性。
Electrochemical performance of Solid Oxide Fuel Cells (SOFC) is highly dependent on the spatial distribution of the reactant and product species. The structure degradation processes are also associated with the spatial quantities. In fact, spatially measured current variations provide profound information about the local processes. Due to the geometry of microtubular SOFCs (mt-SOFC), notable current variations can develop along the cells and cause temperature variations. By applying the electrode-segmentation method, the longitudinal current variation is thus experimentally investigated in an anode-supported mt-SOFC for various cell voltage and fuel flow rates. As a result, a remarkable current variation is shown among the segments for various flow rates. The current of the downstream segment rapidly decreases with the declining cell voltage implying the fuel starvation while the other segments continue to increase their currents. The conventional polarization curve drawn for the whole cell overlaps with the midstream polarization curve, considerably differing from the other segments. The higher N2flow rate with the identical H2flow enhances the overall performance. In comparison with the estimated practical power generation capacity of the whole cell, a notable performance-loss is found due to the inhomogeneity.