Engebretsen, E;
Mason, TJ;
Shearing, PR;
Hinds, G;
Brett, DJL;
(2017)
Electrochemical pressure impedance spectroscopy applied to the study of polymer electrolyte fuel cells.
Electrochemistry Communications
, 75
pp. 60-63.
10.1016/j.elecom.2016.12.014.
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Abstract
The development of novel in-situ diagnostic techniques allows new insight into the internal working of polymer electrolyte fuel cells (PEFCs) so that improved performance can be realised. Electrochemical impedance spectroscopy (EIS) is a widely used characterisation technique that takes advantage of the dynamic relationship between current and voltage to deconvolute critical mechanisms and sources of performance loss occurring with different time constants. Here, we apply electrochemical pressure impedance spectroscopy (EPIS) which examines the transfer function relating reactant gas pressure modulation to the electrical response of the fuel cell. A sinusoidally oscillating perturbation is applied to the cathode backpressure using a loudspeaker arrangement and the resulting voltage perturbation is monitored. It is shown that the technique can be used to separate the explicit effect of water management from reactant starvation when a PEFC is operated under different reactant humidification conditions.
| Type: | Article |
|---|---|
| Title: | Electrochemical pressure impedance spectroscopy applied to the study of polymer electrolyte fuel cells |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.elecom.2016.12.014 |
| Publisher version: | http://dx.doi.org/10.1016/j.elecom.2016.12.014 |
| Language: | English |
| Additional information: | © 2016 Elsevier B.V. All rights reserved. This manuscript version is made available under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International license (CC BY-NC-ND 4.0). This license allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licenses are available at https://creativecommons.org/licenses/. Access may be initially restricted by the publisher. |
| Keywords: | Electrochemical pressure impedance, spectroscopy Polymer electrolyte fuel cell, Backpressure, Transfer function analysis, Water management, Mass transport limitation, Lock-in Thermography, Performance, Batteries Polymer electrolyte fuel cell, Backpressure, Transfer function analysis, Water management, Mass transport limitation |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1545042 |
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