Chen_evaluate-the-validity-ofelectrochemical-impedancemeasurements-of-polymerelectrolyte-fuel-cells-using-acomputational-algorithm-basedon-fast-fourier-tra.pdf (812.39 kB)
Evaluate the validity of electrochemical impedance measurements of polymer electrolyte fuel cells using a computational algorithm based on Fast Fourier Transform
journal contribution
posted on 2016-01-26, 09:27 authored by Samuel Cruz-Manzo, Rui Chen, Paul S. GreenwoodThe 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 ElectrochemistryVolume
1Issue
1:3Pages
1 - 13Citation
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 JournalsVersion
- 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
2015Notes
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=7202Language
- en