Kulikovsky Andrei
Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-14: Electrochemical Process Engineering, D-52425 Jülich, Germany.
Phys Chem Chem Phys. 2020 Sep 8;22(34):19131-19138. doi: 10.1039/d0cp02094j.
A simple numerical method for the calculation of the distribution of relaxation times (DRT) for PEM fuel cell impedance is developed. The method combines the Tikhonov regularization technique and projected gradient iterations. The method is illustrated by calculating DRT for the synthetic impedance of two parallel RC-circuits and for Warburg finite-length impedance. Finally, cathode catalyst layer (CCL) impedance is calculated using the exact analytical solution and the method discussed is applied to understand the behavior of the DRT peak due to oxygen transport in the CCL. The position of the oxygen transport peak on the frequency scale exhibits non-monotonic behavior as the oxygen diffusion coefficient in the CCL decreases, which may serve as an indicator of CCL flooding. The Python code for DRT calculation is available for download.
开发了一种用于计算质子交换膜燃料电池阻抗弛豫时间分布（DRT）的简单数值方法。该方法结合了蒂霍诺夫正则化技术和投影梯度迭代。通过计算两个并联RC电路的合成阻抗以及沃伯格有限长度阻抗的DRT来说明该方法。最后，使用精确的解析解计算阴极催化剂层（CCL）阻抗，并应用所讨论的方法来理解CCL中氧传输导致的DRT峰的行为。随着CCL中氧扩散系数的降低，频率尺度上氧传输峰的位置呈现非单调行为，这可能作为CCL水淹的一个指标。可下载用于DRT计算的Python代码。
