The electronic conductivity of Sm-doped ceria is very low in air but increases substantially in H₂ gas. Conventional models can explain the equilibration processes of yttria-stabilized zirconia electrolytes and thin mixed ionic-electronic conducting electrolytes in response to variations in the fuel composition. However, the equilibration processes of thick samaria-doped ceria electrolytes have not yet been explained. We measured and attempted to explain the equilibration process of a very thick (6.6 mm) samaria-doped ceria electrolyte in response to a change in the anode gas. The measured open-circuit voltage gradually increased to an equilibrium voltage of 0.80 V within 5 min. However, based on the chemical diffusion coefficient equation for the electron diffusion current, the equilibrium time should have been much longer than 5 min. When we assumed a current-independent constant anode voltage loss (0.35 V), the calculations were substantially improved for determining the experimental results.

中文翻译：

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固体氧化物燃料电池中使用浓Sm掺杂二氧化铈电解质对阳极气体变化的响应平衡过程

掺Sm的二氧化铈在空气中的电子电导率很低，但在H _2中却显着增加气体。常规模型可以解释氧化钇稳定的氧化锆电解质和稀薄的混合离子电子导电电解质响应于燃料成分变化的平衡过程。但是，尚未解释厚的掺杂samaria的二氧化铈电解质的平衡过程。我们测量并试图解释响应阳极气体变化而非常厚（6.6毫米）的掺杂samaria的二氧化铈电解质的平衡过程。测得的开路电压在5分钟内逐渐增加到0.80 V的平衡电压。但是，基于电子扩散电流的化学扩散系数方程式，平衡时间应该比5分钟长得多。当我们假设与电流无关的恒定阳极电压损耗（0.35 V）时，