In this study, planar anode‐supported solid oxide fuel cells (5 × 5 cm²) were fabricated with cathode segmentations and tested in a channel type setup. The in‐plane performance variation became significant with an increasing current density (fuel utilization), and impedance analysis on each segment indicated that the poor performance in the outlet region was due to gas conversion overpotential combined with gas concentration overpotential. Pt reference electrodes were embedded in the electrolyte layers of the segments so that the anode and cathode overpotential could be separated for each segment. It was found that the cathode overpotential was dominant for both segments, which suggested that the cathode overpotential determined the overall cell performance. On the other hand, the anode overpotential was responsible for the in‐plane performance variation. Post‐analysis revealed that the Ni anode was partially oxidized and its layer was delaminated in the outlet region. Thus, this study suggests that the anode overpotential related to gas conversion is a critical factor in determining Ni anode stability as well as overall cell performance in planar anode supported cells with a gas channel setup.

中文翻译：

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使用分段阴极和参比电极的阳极支撑固体氧化物燃料电池的面内性能变化的实验研究

在这项研究中，采用平面阳极支撑的固体氧化物燃料电池（5×5 cm ²用阴极分段制造），并在通道类型设置中进行测试。平面内性能变化随着电流密度（燃料利用率）的增加而变得显着，并且每个段上的阻抗分析表明，出口区域的性能较差是由于气体转化超电势和气体浓度超电势所致。铂参比电极嵌入段的电解质层中，因此每个段的阳极和阴极过电势可以分开。发现阴极过电势在两个区段中都是主要的，这表明阴极过电势决定了整个电池的性能。另一方面，阳极超电势是造成平面内性能变化的原因。分析后发现，镍阳极被部分氧化，其阳极层在出口区域分层。因此，这项研究表明，与气体转化相关的阳极超电势是确定Ni阳极稳定性以及带有气体通道设置的平面阳极支撑电池整体电池性能的关键因素。