期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 10, 页码 7502-7514出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.11.223
关键词
Self-heating; Non-isothermal; Voltage recovery; Current distribution mapping; Temperature distribution mapping; Flow orientation
资金
- EPSRC [EP/L015277/1, EP/P009050/1, EP/M014371/1, EP/M009394/1, EP/M023508/1, EP/L015749/1, EP/N022971/1]
- Digital Engineering and Test Centre (APC Spoke) Virtually Connected Hybrid Vehicle (VCHV) project
- EPSRC [EP/M023508/1, EP/P009050/1, EP/M014371/1] Funding Source: UKRI
The polarisation performance of fuel cells is typically reported under controlled temperature conditions, but in practice, self-heating of the fuel cells can affect performance. Mapping current and temperature distribution provides more insight into internal cell operation. Gas manifold positioning also plays a key role in performance, with counter-flow orientation showing the most uniform temperature distribution.
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. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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