The influence of anode microstructural parameters on the electrochemical performance of plasma sprayed solid oxide fuel cells with metal supports has been investigated. Electrochemical impedance spectroscopy (EIS) was used to correlate the measured polarization resistances associated with both the three‐phase boundary length density and gas diffusivity of porous nickel/yttria‐stabilized zirconia (YSZ) anodes. Each anode was deposited in atmospheric conditions using solution precursor plasma spraying (SPPS), dry‐powder plasma spraying (DPPS), or suspension plasma spraying (SPS). The high‐frequency (> 1 kHz) part of the impedance spectrum was found to correlate with the three‐phase boundary length per unit volume of each anode. The low‐frequency part of the impedance spectrum was found to correlate with diffusive transport of gases through the porous anode. Gas transport measurements in the context of the dusty gas model were used to extract microstructure‐dependent parameters that provided a quantitative comparison among the distinct microstructures obtained using the three plasma spray methods. These results were compared to measurements using Darcy's law, which yielded similar trends and provided an efficient method to more rapidly compare gas transport rates in porous electrodes having different structures.

中文翻译：

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微观结构对等离子喷涂Ni-YSZ阳极SOFCs电化学性能的影响

研究了阳极微结构参数对带有金属载体的等离子喷涂固体氧化物燃料电池电化学性能的影响。电化学阻抗谱（EIS）用于关联与多孔镍/氧化钇稳定的氧化锆（YSZ）阳极的三相边界长度密度和气体扩散率相关的极化电阻。使用溶液前驱体等离子喷涂（SPPS），干粉等离子喷涂（DPPS）或悬浮等离子喷涂（SPS）在大气条件下沉积每个阳极。发现阻抗谱的高频（> 1 kHz）部分与每个阳极每单位体积的三相边界长度相关。发现阻抗谱的低频部分与气体通过多孔阳极的扩散传输有关。在含尘气体模型的背景下进行的气体传输测量被用来提取微结构相关的参数，这些参数提供了使用三种等离子体喷涂方法获得的不同微结构之间的定量比较。将这些结果与使用达西定律的测量结果进行了比较，该定律产生了相似的趋势，并提供了一种有效的方法来更快速地比较具有不同结构的多孔电极中的气体传输速率。