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Electro-thermal impedance spectroscopy applied to an open-cathode polymer electrolyte fuel cell

Engebretsen, E; Robinson, JB; Obeisun, O; Mason, T; Finegan, D; Hinds, G; Shearing, PR; (2016) Electro-thermal impedance spectroscopy applied to an open-cathode polymer electrolyte fuel cell. Journal Of Power Sources , 302 pp. 210-214. 10.1016/j.jpowsour.2015.10.047. Green open access

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Abstract

The development of in-situ diagnostic techniques is critical to ensure safe and effective operation of polymer electrolyte fuel cell systems. Infrared thermal imaging is an established technique which has been extensively applied to fuel cells; however, the technique is limited to measuring surface temperatures and is prone to errors arising from emissivity variations and reflections. Here we demonstrate that electro-thermal impedance spectroscopy can be applied to enhance infrared thermal imaging and mitigate its limitations. An open-cathode polymer electrolyte fuel cell is used as a case study. The technique operates by imposing a periodic electrical stimulus to the fuel cell and measuring the consequent surface temperature response (phase and amplitude). In this way, the location of heat generation from within the component can be determined and the thermal conduction properties of the materials and structure between the point of heat generation and the point of measurement can be determined. By selectively ‘locking-in’ to a suitable modulation frequency, spatially resolved images of the relative amplitude between the current stimulus and temperature can be generated that provide complementary information to conventional temporal domain thermograms.

Type: Article
Title: Electro-thermal impedance spectroscopy applied to an open-cathode polymer electrolyte fuel cell
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jpowsour.2015.10.047
Publisher version: http://dx.doi.org/10.1016/j.jpowsour.2015.10.047
Language: English
Additional information: Copyright © 2016 Elsevier Inc. 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 http://creativecommons.org/ licenses/by/4.0. Access may be initially restricted by the publisher.
Keywords: Electro-thermal impedance spectroscopy, Lock-in thermography, Transfer function analysis, Polymer electrolyte fuel cell, Thermal imaging, Electra-thermography
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/1478259
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