Effect of reactant gas flow orientation on the current and temperature distribution in self-heating polymer electrolyte fuel cells

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Effect of reactant gas flow orientation on the current and temperature distribution in self-heating polymer electrolyte fuel cells

Rasha, L; Cho, JIS; Millichamp, J; Neville, TP; Shearing, PR; Brett, DJL; (2021) Effect of reactant gas flow orientation on the current and temperature distribution in self-heating polymer electrolyte fuel cells. International Journal of Hydrogen Energy , 46 (10) pp. 7502-7514. 10.1016/j.ijhydene.2020.11.223. Green open access

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Abstract

Fuel cell polarisation performance is typically reported under controlled/constant temperature conditions, as a sign of robust metrology. However, in practice, fuel cells self-heat as they generate current; which varies the temperature across the polarisation curve and affects performance. More detail regarding the internal cell operation can be gleaned by current and temperature distribution mapping. For the case of an unheated cell, ‘self-heating’ increases the cell temperature and improves performance, resulting in a ‘voltage recovery’ and a more homogeneous current and water distribution. For actively heated cells, a reduced current is observed in regions of high temperature and low humidity. The positioning of the gas manifolds also has a decisive impact on performance by affecting the reactant concentration, humidity and water distribution. Counter- and cross-flow orientations in a self-heating cell were studied, with a counter-flow orientation with air flowing with gravity producing the most uniform temperature distribution.

Type:	Article
Title:	Effect of reactant gas flow orientation on the current and temperature distribution in self-heating polymer electrolyte fuel cells
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1016/j.ijhydene.2020.11.223
Publisher version:	https://doi.org/10.1016/j.ijhydene.2020.11.223
Language:	English
Additional information:	This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.4
Keywords:	Self-heating, Non-isothermal, Voltage recovery, Current distribution mapping, Temperature distribution mapping, Flow orientation
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/10117961