کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1285188 | 973124 | 2009 | 5 صفحه PDF | دانلود رایگان |
We demonstrate a monolithic polymer electrolyte membrane fuel cell by integrating a narrow (200 μm) Nafion strip in a molded polydimethylsiloxane (PDMS) structure. We propose two designs, based on two 200 μm-wide and two 80 μm-wide parallel microfluidic channels, sandwiching the Nafion strip, respectively. Clamping the PDMS/Nafion assembly with a glass chip that has catalyst-covered Au electrodes, results in a leak-tight fuel cell with stable electrical output. Using 1 M CH3OH in 0.5 M H2SO4 solution as fuel in the anodic channel, we compare the performance of (I) O2-saturated 0.5 M H2SO4 and (II) 0.01 M H2O2 in 0.5 M H2SO4 oxidant solutions in the cathodic channel. For the 200 μm channel width, the fuel cell has a maximum power density of 0.5 mW cm−2 and 1.5 mW cm−2 at room temperature, for oxidants I and II, respectively, with fuel and oxidant flow rates in the 50–160 μL min−1 range. A maximum power density of 3.0 mW cm−2 is obtained, using oxidant II for the chip with 80 μm-wide channel, due to an improved design that reduces oxidant and fuel depletion effects near the electrodes.
Journal: Journal of Power Sources - Volume 193, Issue 2, 5 September 2009, Pages 761–765