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An impedance model for analysis of EIS of polymer electrolyte fuel cells under hydrogen peroxide formation in the cathode

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journal contribution
posted on 19.05.2015 by Samuel Cruz-Manzo, Rui Chen, Paul S. Greenwood
Abstract In this study, an impedance model based on electrochemical theory considering hydrogen peroxide formation during a two-step oxygen reduction reaction (ORR) in polymer electrolyte fuel cells (PEFCs) has been developed. To validate the theoretical treatment, electrochemical impedance spectroscopy (EIS) measurements were carried out in an open-cathode 16 cm2 H2/air PEFC stack. The results show that inductive loops at low frequencies of the impedance spectra are attributed to mechanisms related to hydrogen peroxide formation during ORR. The results also demonstrate that the mechanisms during consumption of hydrogen peroxide to form water (second-step in ORR) can be the dominating process for losses in the PEFC compared to the mechanisms during oxygen consumption to form hydrogen peroxide (first-step in ORR). Oxygen transport limitations can be a result of hydrogen peroxide adsorbed onto the surface of the electrode which reduces the number of active sites in the cathode catalyst layer for oxygen to react. This study could support results from other experimental techniques to identify hydrogen peroxide formation during the ORR that limit the performance of PEFCs.

Funding

The authors thank the Mexican National Council for Science and Technology (CONACYT) for the sponsorship of the Ph.D research study of S. Cruz-Manzo (Grant No. 183195).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Journal of Electroanalytical Chemistry

Volume

745

Pages

28 - 36

Citation

CRUZ-MANZO, S., CHEN, R. and GREENWOOD, P.S., 2015. An impedance model for analysis of EIS of polymer electrolyte fuel cells under hydrogen peroxide formation in the cathode. Journal of Electroanalytical Chemistry, 745, pp. 28-36

Publisher

© Elsevier B.V.

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

ISSN

1572-6657

Language

en

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