Nafion film transport properties in a low-Pt PEM fuel cell: impedance spectroscopy study

被引：12

作者：

Reshetenko, Tatyana ^{[1
]}

Kulikovsky, Andrei ^{[2
]}

机构：

[1] Univ Hawaii, Hawaii Nat Energy Inst, Honolulu, HI 96822 USA

[2] Forschungszentrum Julich, Inst Energy & Climate Res, IEK14 Electrochem Proc Engn, D-52425 Julich, Germany

来源：

RSC ADVANCES | 2019年 / 9卷 / 66期

关键词：

CATHODE CATALYST LAYER; OXYGEN-TRANSPORT; PERFORMANCE; MODEL; PARAMETERS; SPECTRUM;

D O I：

10.1039/c9ra07794d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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(-1) to 0.2 s cm(-1) as the cell current density increases from 50 to 800 mA cm(-2). Fitting returns low value of the through-plane oxygen diffusivity in the CCL, indicating that the low-Pt electrode is partially flooded.

引用

页码：38797 / 38806

页数：10

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