Electrochemical impedance spectroscopy data of a polymer electrolyte membrane fuel cell are compiled across a wide range of operating conditions. In all cases, homogeneous operating conditions are applied over the entire cell area to set a clearly defined operating point and to derive unambiguous parameter dependencies. As a novelty, this diverse set of impedance spectra is deconvoluted by the distribution of relaxation times (DRT) method in the frequency range from 0.5 Hz to 60 kHz. In H₂/air-operation five polarization contributions with different time constants are registered. The assignment to gas diffusion in the gas diffusion layer and catalyst layer, the oxygen reduction reaction at the Pt-catalyst and proton transport processes in the cathode catalyst layer is supported by a systematic analysis of parameter dependencies.

Furthermore, DRT deconvolution in H₂/H₂-operation reveals three “new” anode contributions, usually hidden by the dominating cathode contributions. They are assigned to gas diffusion and hydrogen oxidation, including charge-transfer and proton transport in the anode catalyst layer. It is confirmed that the polarization contributions at the cathode side sum up to 96% for typical operating conditions, but the share changes to 80% cathode and 20% anode at low hydrogen partial pressure.

聚合物电解质膜燃料电池的电化学阻抗谱数据是在很宽的操作条件范围内编制的。在所有情况下，均等的工作条件会应用于整个单元区域，以设置明确定义的工作点并得出明确的参数依赖性。作为一种新颖性，通过在0.5 Hz至60 kHz频率范围内的弛豫时间（DRT）分布方法，可以对这套多样化的阻抗谱进行反卷积处理。在H _2中/空中操作记录了五个具有不同时间常数的极化贡献。通过参数相关性的系统分析，可以确定气体扩散层和催化剂层中的气体扩散，Pt催化剂上的氧还原反应以及阴极催化剂层中的质子传输过程。

此外，在H ₂ / H ₂操作中的DRT反卷积揭示了三个“新”阳极贡献，通常被主要的阴极贡献所掩盖。它们被分配给气体扩散和氢氧化，包括阳极催化剂层中的电荷转移和质子传输。可以确定的是，在典型的工作条件下，阴极侧的极化贡献总计为96％，但在低氢分压下，份额变为80％的阴极和20％的阳极。