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Effect of the Structure Design on the Performance of a Passive Vapor-Feed DMFC Fed With Concentrated Methanol

[+] Author Affiliations
Chao Xu, Amir Faghri, Xianglin Li

University of Connecticut, Storrs, CT

Paper No. FuelCell2010-33094, pp. 51-57; 7 pages
doi:10.1115/FuelCell2010-33094
From:
  • ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology
  • ASME 2010 8th International Fuel Cell Science, Engineering and Technology Conference: Volume 1
  • Brooklyn, New York, USA, June 14–16, 2010
  • Conference Sponsors: Advanced Energy Systems Division
  • ISBN: 978-0-7918-4404-5 | eISBN: 978-0-7918-3875-4
  • Copyright © 2010 by ASME

abstract

A passive vapor-feed direct methanol fuel cell (DMFC), which has a membrane vaporizer and a hydrophobic vapor transport layer (VTL), was investigated experimentally to improve its performance when fed with highly concentrated or neat methanol. DMFCs with different structure parameters, such as the VTL thickness, open area ratio of the vaporizer, and thickness of the water management layer, were tested using different methanol concentrations varying from 6 M to neat methanol. The results showed that the performance of the passive vapor-feed DMFC mainly depended on the trade-off between the methanol vapor supply to the anode and methanol crossover through the membrane. Thickening the VTL, or decreasing the open area ratio of the vaporizer, were found to effectively decrease the transport rate of methanol vapor to the anode, leading to an increase in the concentration of the optimum methanol feeding. The hydrophobic water management layer in the cathode was also found to be useful to lower the methanol crossover.

Copyright © 2010 by ASME

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