Analysis of proton and electron transport impedance of a PEM fuel cell in H2/N2 regime

Electrochemical Science Advances

Andrei Kulikovsky¹ 

[1] Forschungszentrum Jülich GmbH Institute of Energy and Climate Research IEK–14: Electrochemical Process Engineering Jülich D–52425 Germany;

关键词: electron conductivity;    impedance;    modeling;    PEM fuel cell;    proton conductivity;   

DOI  :  10.1002/elsa.202000023

来源: DOAJ

【 摘 要 】

Abstract Analytical expressions for impedance of proton and electron transport in the cathode catalyst layer of a PEM fuel cell operating in H2/N2 regime are derived. In the high–frequency range, the dependence of imaginary part of impedance on 1/ω is a straight line with the slope depending on the cathode catalyst layer (CCL) proton and electron conductivity. The characteristic frequencies of proton fp and electron fe transport associated with the double layer charging are close to each other (denoted below as fpe). The frequency fpe in the cathodes of various type may differ by three orders of magnitude. DRT spectrum of CCL impedance in H2/N2 regime shows two peaks located at the frequencies fpe and fe∗. The second frequency fe∗ of electron transport in the CCL is about four times higher than fpe. Analytical results can be used for simultaneous measurement of proton and electron conductivity of PEMFC cathodes using electrochemical impedance spectroscopy.

【 授权许可】

Unknown