The performance of a membraneless laminar flow micro fuel cell was evaluated under different operating conditions. The fuel cell was microfabricated in poly-dimethyl-siloxane using standard soft-lithography techniques. It used methanol solution as the fuel for the anode side, and oxygen saturated sulfuric acid for the cathode. The parameters studied were the methanol concentration and the concentration of sulfuric acid in the anode stream. The performance was characterized by V-I plots, stability of open circuit potential, and anode polarization curves. Our results show that the power output of the device decreases with increase in the methanol concentration. It is shown that these trends are caused by the cell’s internal resistance to proton transport. The addition of sulfuric acid to the fuel significantly decreases this resistance. The device open circuit potential was not stable over extended operation, and could drop by more than 150 mV in 72 hours.

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