Kulikovsky Andrei
Theory and Computation of Energy Materials (IEK-13), Institute of Energy and Climate Research, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
Membranes (Basel). 2022 Mar 24;12(4):356. doi: 10.3390/membranes12040356.
In this study, a model for concentration/pressure impedance ζ of the cathode catalyst layer of a low-Pt PEM fuel cell is developed. The model is based on transient oxygen mass transport equations through the cathode catalyst layer modeled as a single pore with a thin Nafion film covering the pore surface. This structure is used to simulate oxygen transport through the catalyst layer depth and through the ionomer film covering Pt/C agglomerates in low-Pt cells. Analytical solution for zeta-impedance at high cell current is derived; this solution can be used for fast fitting of experimental zeta-spectra. Optimal conditions for measuring the zeta-spectra of a low-Pt cell are discussed. Zeta impedance is not affected by faradaic processes in the cell, which makes this technique a useful alternative to standard EIS.
在本研究中，开发了一种用于低铂质子交换膜燃料电池阴极催化剂层的浓度/压力阻抗ζ模型。该模型基于通过阴极催化剂层的瞬态氧气质量传输方程，该催化剂层被建模为单个孔隙，孔隙表面覆盖有薄的Nafion膜。这种结构用于模拟低铂电池中氧气通过催化剂层深度以及通过覆盖Pt/C团聚体的离聚物膜的传输。推导了高电池电流下ζ阻抗的解析解；该解可用于快速拟合实验ζ谱。讨论了测量低铂电池ζ谱的最佳条件。ζ阻抗不受电池中法拉第过程的影响，这使得该技术成为标准电化学阻抗谱的一种有用替代方法。
