Naslov
Modeling of inductive phenomena at low frequencies in electrochemical impedance spectroscopy of PEM fuel cell

Autori
Pivac, Ivan ; Barbir, Frano

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts 14th Symposium on Fuel Cell and Battery Modelling and Experimental Validation, Modval 2017 / - Karlsruhe : KIT Karlsruhe, 2017, 27-27

Skup
14th Symposium on Fuel Cell and Battery Modelling and Experimental Validation, Modval 2017

Mjesto i datum
Karlsruhe, Njemačka, 02.03.2017. - 03.03.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
PEM Fuel Cell, electrochemical impedance sprectroscopy, inductance, equivalent circuit model

Sažetak
Inductive phenomena at low frequencies have been already noticed in the results of electrochemical impedance spectroscopy (EIS) of proton exchange membrane (PEM) fuel cells as an additional loop crossing on the positive side of the Im(Z) axis in the Nyquist plot. In literature, two generalized explanations with their variations have been imposed as possible causes of inductive phenomena at low frequencies: side reactions with intermediate species and water transport characteristics. Additionally, carbon monoxide poisoning can also be a cause when reactant gases are not used rated ultrapure. However, different interpretations and diverse models of this phenomena have given us a new motivation to use EIS for a better understanding and identification of inductive loop processes, which are obviously occurring within the fuel cell, but are apparently still missing. In this paper, a novel 11-element impedance model with two resonant loops, has been validated via detailed EIS measurements at different current densities, cell temperatures, gas humidities, air flow stoichiometries and backpressures. The simulation results show very good agreement with those from the experimental measurement data, including the low-frequency capacitive loop followed by the inductive loop and the trends of changes of the extracted model element values are mainly consistent with the expectations based on their physical interpretation.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA