Variation of PEM Fuel Cell Physical Parameters with Current: Impedance Spectroscopy Study

被引：35

作者：

Reshetenko, Tatyana ^{[1
]}

Kulikovsky, Andrei ^{[2
,3
]}

机构：

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

[2] Res Ctr Juelich, Inst Energy & Climate Res, Electrochem Proc Engn IEK 3, D-52425 Julich, Germany

[3] Moscow MV Lomonosov State Univ, Ctr Res Comp, Moscow 119991, Russia

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2016年 / 163卷 / 09期

关键词：

CATHODE CATALYST LAYER; GAS-DIFFUSION ELECTRODES; MASS-TRANSPORT; MODEL; PLATINUM; PERFORMANCE; SPECTRA; FLOW; OSCILLATIONS; DEGRADATION;

D O I：

10.1149/2.0981609jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Experimental impedance spectra of a segmented PEM fuel cell are fitted using a numerical impedance model based on the transient macrohomogeneous equations for the cathode side. Dependence of the cell transport and kinetic parameters on the current density is reported in the range from 50 to 400 mA cm(-2). The largest variation (growth by an order of magnitude) exhibit the cathode catalyst layer proton conductivity sp and oxygen diffusivity. Moreover, sp exhibits a stepwise change at the current density similar or equal to 200 mA cm(-2). This jump could lead to formation of current-carrying and current-free zones over the cell surface. Recent experimental data (JES, 156, B301 (2009)) show that this configuration is indeed realized in PEMFCs with the high-and low-current density zones under the channel and rib, respectively. (C) The Author(s) 2016. Published by ECS. All rights reserved.

引用

页码：F1100 / F1106

页数：7

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