A micro methanol fuel cell operating at near room temperature

Yen, T.J.; Fang, N.; Zhang, X.; Lu, G.Q.; Wang, C.Y.
November 2003
Applied Physics Letters;11/10/2003, Vol. 83 Issue 19, p4056
Academic Journal
We present a bipolar micro direct methanol fuel cell (μDMFC) with high-power density and simple device structure. A proton exchange membrane-electrode assembly was integrated in a Si-based μDMFC with micro channels 750 μm wide and 400 μm deep, fabricated using silicon micromachining. The μDMFC has been characterized at near room temperature, showing a maximum power density of 47.2 mW/cm[sup 2] when 1 M methanol was fed at 60 °C. The cell voltage dependence on the current density agrees well with the modified Tafel model, in which regimes of kinetic polarization and ohmic polarization are observed without significant presence of the concentration polarization. © 2003 American Institute of Physics.


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