A simple equation for in situ measurement of the catalyst layer oxygen diffusivity in PEM fuel cell

被引：16

作者：

Kulikovsky, A. A. ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Energy & Climate Res, IEK Electrochem Proc Engn 3, D-52425 Julich, Germany

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2014年 / 720卷

关键词：

PEM fuel cell; Catalyst layer; Oxygen diffusion; Modeling; MASS-TRANSPORT LIMITATIONS; ELECTROCHEMICAL IMPEDANCE; TRANSIENT TECHNIQUES; CATHODE; ELECTRODES;

D O I：

10.1016/j.jelechem.2014.03.005

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We report a method for in situ determination of the oxygen diffusion coefficient D in the cathode catalyst layer (CCL) of a PEM fuel cell. The method is based on our recent model equation for the CCL polarization potential. Two low-current impedance spectra of the CCL should be measured for the same cell current and different oxygen concentrations. We show that D is given by D = (k - 1)bl(t)/(k12F delta R(ccl)c), where b is the Tafel slope, l(t) is the CCL thickness, delta R-ccl is the difference of the low-frequency CCL resistivities, c is the smallest oxygen concentration used in experiments, and k > 1 is the ratio of two concentrations. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：47 / 51

页数：5

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