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Ni_(0.75)Co_(0.25)/(Gd_2O_3-CeO_2) Anodes for Solid Oxide Fuel Cells

机译:用于固体氧化物燃料电池的Ni_(0.75)CO_(0.25)/(GD_2O_3-CEO_2)阳极

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Electrochemical performance of solid oxide fuel cells based on Ni_(0.75)Co_(0.25)-GDC (Gd_(0.1)Ce_(0.9)O_(1.95)) and Ni-GDC anodes were investigated and compared in order to understand the effects of (i) alloying Ni with Co and (ii) anode microstructure on the cell performance under hydrogen fuel. At the sintering temperature of 1300°C for 5 h, the Ni_(0.75)Co_(0.25)-GDC anode showed a superior distribution and connection of grains to the Ni-GDC anode which had grain clustering structure in general. Grain growth and connection were found in both anodes when the sintering temperature was increased to 1350°C for 3 h. This resulted in significant improvement of the anodic polarization resistance for the Ni-GDC anode but only minor change for the Ni_(0.75)Co_(0.25)-GDC anode. This research, however, showed that the Ni-GDC anode had higher anodic polarization resistance than the Ni_(0.75)Co_(0.25)-GDC anode, resulting in the better cell power density at all sintering conditions. The maximum power density obtained at 800°C for the cell with the Ni_(0.75)Co_(0.25)-GDC anode was 118 mW-cm~(-2). Impedance spectroscopy analysis showed that the total cell resistance of both cell types became progressively larger when the operation time was prolonged to 10 h at 800°G, while the microstructure change was not observable by the SEM. The reason for the fast degradation will thus require further investigation.
机译:基于Ni_(0.75)CO_(0.25)-GDC(GD_(0.1)CE_(0.9)CE_(0.9)O_(1.95))和Ni-GDC阳极的电化学性能,并比较,以了解( i)用CO和(II)氢燃料下电池性能的合金Ni和(II)阳极微观结构。在1300℃的烧结温度下5小时,Ni_(0.75)CO_(0.25)-GDC阳极显示出具有谷物聚类结构的谷粒的优异分布和连接。当烧结温度升至1350℃时,在两个阳极中发现谷物生长和连接3小时。这导致Ni-GDC阳极的阳极偏振电阻的显着改善,但仅对Ni_(0.75)CO_(0.25)-GDC阳极进行微小变化。然而,该研究表明,Ni-GDC阳极具有比Ni_(0.75)CO_(0.25)-GDC阳极更高的阳极偏振电阻,导致所有烧结条件下的细胞功率密度更好。具有Ni_(0.75)CO_(0.25)-GDC阳极的电池为800℃获得的最大功率密度为118mW-cm〜(-2)。阻抗光谱分析显示,当操作时间在800°G延长到10小时时,两种细胞类型的总细胞抗性变得逐渐变大,而微观结构变化不会被SEM观察到。因此需要进一步调查快速退化的原因。

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