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Effects of Ambient Conditions on the Cell Performance of a Passive Air-Breathing DMFC

[+] Author Affiliations
Xiaowei Zhu, Jun Li, Qiang Liao, Xun Zhu, Dingding Ye

Chongqing University, Chongqing, China

Paper No. FuelCell2008-65039, pp. 751-756; 6 pages
doi:10.1115/FuelCell2008-65039
From:
  • ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology
  • ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology
  • Denver, Colorado, USA, June 16–18, 2008
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4318-1 | eISBN: 0-7918-3822-6
  • Copyright © 2008 by ASME

abstract

In the present study, a passive air-breathing direct methanol fuel cell (DMFC) with an active area of 4.41 cm2 and a built-in methanol solution reservoir of 8 ml was used to investigate the effects of relative humidity (RH) and temperature of ambient atmosphere on cell performance and cathodic flooding. The experimental results indicate that the effects of RH on cell performance are dependent upon temperature. When the temperature is below 10 °C, RH shows no effect on the cell performance. At the temperature of 20 °C and 35 °C, the cell performance is quite similar at low to medium current densities, and the cell performance increases with the decrease of RH at high current densities. In the case of 50 °C, it seems that RH has a greater effect on the cell performance than those at lower temperature: the cell performance is improved at low to medium current densities, whereas it is depraved at high current densities with the increase of RH. Furthermore, it is found that water flooding at the cathode was strongly dependent on the competition of water evaporation and production. High RH and low temperature led to more serious water flooding at the cathode. A better long-term discharge performance can be obtained under the condition of high temperature and low RH.

Copyright © 2008 by ASME

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