Reshetenko Tatyana, Kulikovsky Andrei
Hawaii Natural Energy Institute, University of Hawaii Honolulu Hawaii 96822 USA
Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-14: Electrochemical Process Engineering D-52425 Jülich Germany
RSC Adv. 2019 Nov 27;9(66):38797-38806. doi: 10.1039/c9ra07794d. eCollection 2019 Nov 25.
Unexpected over-linear transport loss in low-Pt PEM fuel cells has been a subject of numerous studies and discussions in literature. Most of the authors agree that these losses are due to oxygen transport in the Nafion film covering Pt/C agglomerates in the cathode catalyst layer (CCL). We develop a model for PEM fuel cell impedance, which takes into account oxygen transport through the film. The model is fitted to experimental impedance spectra of a low-Pt PEM fuel cell. Fitting gives the film thickness in the range of 10 to 13 nm, and the film transport resistivity decreasing from 1.2 s cm to 0.2 s cm as the cell current density increases from 50 to 800 mA cm. Fitting returns low value of the through-plane oxygen diffusivity in the CCL, indicating that the low-Pt electrode is partially flooded.
低铂质子交换膜燃料电池中意外的超线性传输损失一直是文献中众多研究和讨论的主题。大多数作者认为，这些损失是由于覆盖在阴极催化剂层（CCL）中Pt/C团聚体上的Nafion膜中的氧传输所致。我们开发了一个质子交换膜燃料电池阻抗模型，该模型考虑了通过该膜的氧传输。该模型与低铂质子交换膜燃料电池的实验阻抗谱相拟合。拟合得出膜厚度在10至13纳米范围内，并且随着电池电流密度从50 mA/cm²增加到800 mA/cm²，膜传输电阻率从1.2 s·cm降至0.2 s·cm。拟合得到CCL中平面内氧扩散率的低值，表明低铂电极部分被淹没。
