| Summary: | 碩士 === 國立勤益科技大學 === 冷凍空調系 === 99 === In this study, the material of polydimethylsiloxane (PDMS) with hydrophobic property was used to be the anode channels of the direct methanol fuel cells (DMFCs), In order to enhance the performance of the Direct Methanol Fuel Cell (DMFC), the product of CO2 bubble has to be efficiently removed from the anode channel during the electrochemical reaction. In this study, different anode channel widths of 2mm, 1.75mm, 1.5mm, 1.25mm, 1mm, 0.8mm and 0.6mm were fabricated used the PMMS material in order to investigate the effect of the anode channel width on the performance of the DMFCs. In this study, it was found that for the DMFCs with smaller anode channel width (0.8mm), the performance of the DMFCs can be enhanced under low operating temperature and low supplied fuel flow rate due to the uniform distributions of the fuel upon the anode collectors and longer retention periods of the fuel within the anode channels. However, while the width of the anode channel is less than 0.6mm, the hydro-resistant from the CO2 bubbles producing within the anode channels seriously increases, which hinders the fuel from moving into the anode channels through the wriggle pump. Consequently, the outputs of the DMFCs decrease obviously. Furthermore, under higher operating temperature and higher supplied fuel flow rate, the performance of the DMFCs with wider anode channel (1.8mm) is better than that with smaller anode channel.
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