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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/21461

Title: An impedance model for analysis of EIS of polymer electrolyte fuel cells under platinum oxidation and hydrogen peroxide formation in the cathode
Authors: Cruz-Manzo, Samuel
Perezmitre-Cruz, Cesar
Greenwood, Paul S.
Chen, Rui
Keywords: EIS
Fuel cell
Impedance model
Oxygen reduction reaction
Hydrogen peroxide
Platinum oxide
Issue Date: 2016
Publisher: © Elsevier
Citation: CRUZ-MANZO, S. ... et al., 2016. An impedance model for analysis of EIS of polymer electrolyte fuel cells under platinum oxidation and hydrogen peroxide formation in the cathode. Journal of Electroanalytical Chemistry, 771, pp.94-105.
Abstract: In this study, an impedance model based on electrochemical theory of platinum oxide formation has been developed and combined with the impedance model based on hydrogen peroxide formation during the oxygen reduction reaction (ORR) and reported in a previous study to characterise inductive loops in impedance spectra of polymer electrolyte fuel cells (PEFCs). To validate the theoretical treatment, the simulated frequency response predicted by the theoretical model is compared against electrochemical impedance spectroscopy (EIS) measurements carried out in an open-cathode 16 cm2 H2/air PEFC stack at three different current densities. The results show that neither model in isolation (hydrogen peroxide nor platinum oxide models) can accurately reproduce the inductive loops in the EIS measurements at low frequencies. By deriving a model considering kinetics of hydrogen peroxide and platinum oxide formation, it is possible to reproduce the inductive loops at low frequencies and to estimate the DC polarisation resistance related to the slope of the polarisation curve as frequency reaches zero during EIS. This study demonstrates that different mechanisms that cause PEFC degradation and low performance could be manifested in EIS measurements simultaneously. The resulting model could support other electrochemical techniques to quantify the rates of hydrogen peroxide and platinum oxide formation during the ORR that limit the performance of PEFCs.
Description: This item will remain closed access until 20/04/2017.
Version: Accepted for publication
DOI: 10.1016/j.jelechem.2016.02.046
URI: https://dspace.lboro.ac.uk/2134/21461
Publisher Link: http://dx.doi.org/10.1016/j.jelechem.2016.02.046
ISSN: 1572-6657
Appears in Collections:Closed Access (Aeronautical and Automotive Engineering)

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