Meyer, Q;
Ashton, S;
Torija, S;
Gurney, C;
Boillat, P;
Cochet, M;
Engebretsen, E;
... Brett, DJL; + view all
(2016)
Nitrogen Blanketing and Hydrogen Starvation in Dead-Ended-Anode Polymer Electrolyte Fuel Cells Revealed by Hydro-Electro-Thermal Analysis.
Electrochimica Acta
, 203
pp. 198-205.
10.1016/j.electacta.2016.04.018.
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Abstract
Dead-ended anode operation has a number of practical advantages that simplify system complexity and lower cost for polymer electrolyte fuel cells. However, dead-ended mode leads to performance loss over time which can only be reversed by performing intermittent purge events. This work applies a combined hydro-electro-thermal analysis to an air-cooled open-cathode fuel cell, presenting experimental functional maps of water distribution, current density and temperature. This approach has allowed the identification of a 'nitrogen blanketing' effect due to nitrogen cross-over from the cathode and a 'bypass' effect where a peripheral gap between the gasket and the GDL offers a hydrogen flow 'short circuit' to the border of the electrode. A consequence of high local current density at the margin of the electrode, and resulting high temperatures, may impact the lifetime of the cell in dead-end mode.
| Type: | Article |
|---|---|
| Title: | Nitrogen Blanketing and Hydrogen Starvation in Dead-Ended-Anode Polymer Electrolyte Fuel Cells Revealed by Hydro-Electro-Thermal Analysis |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.electacta.2016.04.018 |
| Publisher version: | http://dx.doi.org/10.1016/j.electacta.2016.04.018 |
| Language: | English |
| Additional information: | Copyright © 2016 Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Keywords: | Dead-ended anode; bypass effect; neutron imaging; nitrogen blanketing; current and temperature mapping |
| 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/1498675 |
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