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Evaluate the validity of electrochemical impedance measurements of polymer electrolyte fuel cells using a computational algorithm based on Fast Fourier Transform

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journal contribution
posted on 26.01.2016 by Samuel Cruz-Manzo, Rui Chen, Paul S. Greenwood
The validity of electrochemical impedance measurements of polymer electrolyte fuel cells (PEFCs) have to be evaluated before an attempt is made to interpret the electrochemical mechanisms represented in the Nyquist plot. This evaluation can be carried out by data transformation of impedance measurements using Kramers-Kronig (K-K) relations. However, this evaluation has been commonly neglected in the fuel cell area due to the complexity of applying the mathematical K-K relations to real-world impedance measurements. In this study a computational algorithm, based on the Fast Fourier Transform (FFT) theory, the Hilbert transformation of impedance data, and a validated impedance model for PEFCs, for evaluating data transformation (real to imaginary Z’→Z’’ and imaginary to real Z’’→Z’) and hence validity of impedance measurements of PEFCs has been developed in Matlab®. With this computational algorithm it is possible to identify the factors that lead to incorrect EIS measurements of PEFCs such as inductance effect from the electrical cables of the measurement system, incorrect AC amplitude signal, and instability during EIS measurements. The computational algorithm developed in this study enables more accurate impedance results to be obtained to study the performance and state of health of PEFCs.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Insights in Analytical Electrochemistry

Volume

1

Issue

1:3

Pages

1 - 13

Citation

CRUZ-MANZO, S., CHEN, R. and GREENWOOD, P.S., 2015. Evaluate the validity of electrochemical impedance measurements of polymer electrolyte fuel cells using a computational algorithm based on Fast Fourier Transform. Insights in Analytical Electrochemistry, 1(1:3), pp. 1-13.

Publisher

iMedPub Journals

Version

VoR (Version of Record)

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

Notes

This paper was accepted for publication in the journal Insights in Analytical Electrochemistry and the definitive published version is available at http://electroanalytical.imedpub.com/evaluate-the-validity-of-electrochemical-impedancemeasurements-of-polymer-electrolyte-fuel-cells-using-acomputational-algorithm-based-on-fast-fourier-transform.php?aid=7202

Language

en

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