The interest in polymer electrolyte membrane fuel cells for automotive applications is nowadays increasing. To run such systems efficiently, the operating strategy relies on information about the stacks operational conditions. The cell capacitance, in most cases, contains such information and it can be measured in real‐time using electrochemical impedance spectroscopy. However, the influence of the operating conditions on the cell capacitance is poorly understood so far. Therefore, this work analyses the influence of the oxygen content and cell voltage. Cyclic voltammetry and impedance spectroscopy data show equal hydrogen adsorption charges in oxygen‐free operation. In oxygen‐saturated atmosphere, the adsorption capacitance below 0.40 V is suppressed, probably owing to the fast adsorption of OH^*. However, this allows distinction between the oxygen‐free and oxygen‐saturated conditions, as in the first case the total capacitance is significantly larger. Thus, an impedance‐based operation strategy could detect oxygen undersupply in the fuel cells in real‐time.

中文翻译：

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聚合物电解质膜燃料电池运行过程中的电容行为分析

如今，对用于汽车应用的聚合物电解质膜燃料电池的兴趣正在增加。为了有效地运行这样的系统，操作策略依赖于有关堆栈操作条件的信息。在大多数情况下，电池电容包含此类信息，可以使用电化学阻抗谱实时测量。但是，到目前为止，对电池电容的工作条件的影响知之甚少。因此，这项工作分析了氧含量和电池电压的影响。循环伏安法和阻抗谱数据显示在无氧操作中氢吸附电荷相等。在氧饱和的气氛中，低于0.40 V的吸附电容受到抑制，这可能是由于OH ^*的快速吸附^*。但是，这可以区分无氧和氧饱和条件，因为在第一种情况下，总电容要大得多。因此，基于阻抗的运行策略可以实时检测燃料电池中的氧气供应不足。