Ni/8 mol% Y2O3-stabilized zirconia cermets are used in thin-film electrolyte solid-oxide fuel cells as support substrates. Rapid oxidation of the metallic Ni can cause failure of the substrate and of the whole system. The rate of Ni oxidation in air and in an inert atmosphere containing water vapor was determined as a function of temperature between 500 and 950 °C. A logarithmic rate law describes the oxidation kinetics in air, whereas a linear rate law fits the first branch of the curve of the experimental data in a humidified inert atmosphere. The substrate exhibits no significant mechanical degradation after uniform oxidation under moderate conditions. However, the observed bending of the samples after oxidation in humidified argon, due to the nonuniform oxidation, can cause damage to fuel cell
在薄膜电解质固态氧化物燃料电池中,镍/8 mol% Y2O3 稳定氧化锆金属陶瓷被用作支撑基板。金属镍的快速氧化会导致衬底和整个系统失效。我们测定了镍在空气和含有水蒸气的惰性气氛中的氧化速率与 500 至 950 °C 温度之间的函数关系。对数速率法则描述了空气中的氧化动力学,而线性速率法则则符合加湿惰性气氛中实验数据曲线的第一分支。在中等条件下均匀氧化后,基底没有出现明显的机械降解。但是,在加湿氩气中氧化后,由于氧化不均匀,观察到样品出现弯曲,这可能会对燃料电池造成损坏。