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A study on the overall efficiency of direct methanol fuel cell by methanol crossover current

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  • Seo, Sang Hern
  • Lee, Chang Sik

Abstract

This paper was presented to determine the methanol crossover and efficiency of a direct methanol fuel cell (DMFC) under various operating conditions such as cell temperature, methanol concentration, methanol flow rate, cathode flow rate, and cathode backpressure. The methanol crossover measurements were performed by measuring crossover current density at an open circuit using humidified nitrogen instead of air at the cathode and applied voltage with a power supply. The membrane electrode assembly (MEA) with an active area of 5Â cm2 was composed of a Nafion 117 membrane, a Pt-Ru (4Â mg/cm2) anode catalyst, and a Pt (4Â mg/cm2) cathode catalyst. It was shown that methanol crossover increased by increasing cell temperature, methanol concentration, methanol flow rate, cathode flow rate and decreasing cathode backpressure. Also, it was revealed that the efficiency of the DMFC was closely related with methanol crossover, and significantly improved as the cell temperature and cathode backpressure increased and methanol concentration decreased.

Suggested Citation

  • Seo, Sang Hern & Lee, Chang Sik, 2010. "A study on the overall efficiency of direct methanol fuel cell by methanol crossover current," Applied Energy, Elsevier, vol. 87(8), pages 2597-2604, August.
    • Handle: RePEc:eee:appene:v:87:y:2010:i:8:p:2597-2604
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    References listed on IDEAS

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    1. Marsala, Giuseppe & Pucci, Marcello & Vitale, Gianpaolo & Cirrincione, Maurizio & Miraoui, Abdellatif, 2009. "A prototype of a fuel cell PEM emulator based on a buck converter," Applied Energy, Elsevier, vol. 86(10), pages 2192-2203, October.
    2. Prater, Daniel N. & Rusek, John J., 2003. "Energy density of a methanol/hydrogen-peroxide fuel cell," Applied Energy, Elsevier, vol. 74(1-2), pages 135-140, January.
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