Coal syngas, a potential fuel for SOFCs, contains impurities like PH₃, which rapidly degrade Ni-based SOFC anodes. Past research showed significant reconstruction of Ni anodes in button cells with degradation rates of ∼0.5 mV∙h⁻¹. It is not evident that these rates correspond to actual stack applications due to major differences in fuel utilization and delivery. Herein, a single planar repeat unit with an active area of 32.64 cm² is constructed using a Haynes^® 242 manifold. The cell operates at 800 °C using dry H₂ with and without 10 ppm PH₃. The cell employs a co-flow configuration with a fuel utilization of 12.5%. The performance of the cell is evaluated over 440 h by voltage-current measurements and electrochemical impedance spectroscopy. The post-run analysis of the contaminated cell is conducted via XRD, XPS and SEM. The degradation rate for the cell is found to be 3×10⁻³ mV∙h⁻¹, which is far lower than that reported previously. The cell shows low evidence of significant PH₃ poisoning and there is no reconstruction of the Ni-anode microstructure, as seen in button cell testing. Some basic electrochemical and thermodynamic modeling, and microstructural/chemical characterization are presented and related to the cell's relatively stable performance observed in this work.

煤合成气（一种潜在的SOFC燃料）包含PH _3之类的杂质，这些杂质会迅速降解Ni基SOFC阳极。过去的研究表明纽扣电池中镍阳极的显着重建，其降解速率约为0.5 mV∙h ^-1。由于燃料利用和输送方面的重大差异，这些速率是否与实际的烟囱应用相对应尚不明显。这里，用的32.64厘米的有源区域中的单个平面重复单元²使用海恩斯构造^® 242歧管。电池在有和没有10 ppm PH _3的干燥H ₂下在800°C下运行。该电池采用并流配置，燃料利用率为12.5％。通过电压-电流测量和电化学阻抗谱，在440小时内评估了电池的性能。通过XRD，XPS和SEM进行污染细胞的运行后分析。发现该电池的降解速率为3×10 ^-3  mV∙h ^-1，远低于先前报道的降解速率。如纽扣电池测试所示，该电池显示出明显的PH ₃中毒证据，并且镍阳极微结构没有重建。提出了一些基本的电化学和热力学模型，以及微观结构/化学表征，并与在这项工作中观察到的电池的相对稳定性能有关。