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Improvement on performance and efficiency of direct methanol fuel cells using hydrocarbon-based membrane electrode assembly

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  • Kim, Joon-Hee
  • Yang, Min-Jee
  • Park, Jun-Young

Abstract

In order to improve the energy efficiency (fuel efficiency and electrical power) of direct methanol fuel cells (DMFCs), the hydrocarbon (HC) membrane-based membrane electrode assemblies (MEAs) are investigated under various operating conditions. The MEAs are then compared with the conventional Nafion-based MEA in terms of their efficiency and performance. The Faradaic efficiency and water transfer coefficient (WTC) are calculated based on mass balance measurements. The Faradaic efficiency of the HC-based MEAs is improved over the Nafion-based MEAs since methanol crossover decreased. The performance of HC-based MEAs shows strong dependency on the anode stoichiometry at high current densities probably because of the limited mass transport of fuel, which is not observed for the Nafion-based MEAs. The Nafion-based MEAs show a WTC of 3, whereas the HC-based MEAs show a very low WTC of −2, indicating the back-diffusion of water from the cathode to the anode. This may have limited mass transport by interrupting proton conduction at high current densities. The performance of HC-based MEAs at high current densities is improved as the fuel stoichiometry increases; High Faradaic efficiency is maintained by decreasing the cathode stoichiometry.

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  • Kim, Joon-Hee & Yang, Min-Jee & Park, Jun-Young, 2014. "Improvement on performance and efficiency of direct methanol fuel cells using hydrocarbon-based membrane electrode assembly," Applied Energy, Elsevier, vol. 115(C), pages 95-102.
    • Handle: RePEc:eee:appene:v:115:y:2014:i:c:p:95-102
    DOI: 10.1016/j.apenergy.2013.10.056
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    Cited by:

    1. Liu, Guicheng & Li, Xinyang & Wang, Hui & Liu, Xiuying & Chen, Ming & Woo, Jae Young & Kim, Ji Young & Wang, Xindong & Lee, Joong Kee, 2017. "Design of 3-electrode system for in situ monitoring direct methanol fuel cells during long-time running test at high temperature," Applied Energy, Elsevier, vol. 197(C), pages 163-168.
    2. Zainoodin, A.M. & Kamarudin, S.K. & Masdar, M.S. & Daud, W.R.W. & Mohamad, A.B. & Sahari, J., 2014. "Investigation of MEA degradation in a passive direct methanol fuel cell under different modes of operation," Applied Energy, Elsevier, vol. 135(C), pages 364-372.
    3. Youngseung Na & Federico Zenith & Ulrike Krewer, 2015. "Increasing Fuel Efficiency of Direct Methanol Fuel Cell Systems with Feedforward Control of the Operating Concentration," Energies, MDPI, vol. 8(9), pages 1-21, September.
    4. Calabriso, Andrea & Borello, Domenico & Romano, Giovanni Paolo & Cedola, Luca & Del Zotto, Luca & Santori, Simone Giovanni, 2017. "Bubbly flow mapping in the anode channel of a direct methanol fuel cell via PIV investigation," Applied Energy, Elsevier, vol. 185(P2), pages 1245-1255.
    5. An, Myung-Gi & Mehmood, Asad & Ha, Heung Yong, 2014. "Sensor-less control of the methanol concentration of direct methanol fuel cells at varying ambient temperatures," Applied Energy, Elsevier, vol. 129(C), pages 104-111.
    6. An, Myung-Gi & Mehmood, Asad & Ha, Heung Yong, 2014. "A sensor-less methanol concentration control system based on feedback from the stack temperature," Applied Energy, Elsevier, vol. 131(C), pages 257-266.
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    8. Mehmood, Asad & An, Myung-Gi & Ha, Heung Yong, 2014. "Physical degradation of cathode catalyst layer: A major contributor to accelerated water flooding in long-term operation of DMFCs," Applied Energy, Elsevier, vol. 129(C), pages 346-353.

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