| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 92 === Direct Methanol Fuel Cell (DMFC) working based on the reactants of methanol liquid and oxygen. It provide an advantage of convenience of use and no danger of a hydrogen explosion and has extended itself as a part of the portable electronic products for individuals. Its largely potential application in the future has made it very popular in research and development in recent years.
The main purpose of this experiment is to raise the performance of DMFC through change the factors of flow variables and screw torque from observation of the voltage-current curve varying and recording of the limiting current. Flow variables cover concentration, volume flow rate, and pressure of methanol liquid and oxygen, and screw torque indicates the tightness pressure of fuel cell stack that is the contact pressure between MEA and graphite channel board. This experimental study is also to explore the influence of different variables on DMFC and the relationship between them.
The outcome of experiment shows that the concentration and volume flow rate of anodic methanol liquid will have an effect on DMFC only at the time while the concentration of oxygen is declining, but the concentration and volume flow rate of cathode oxygen will have a direct and large effect on DMFC. It will raise the performance of DMFC through an increase of concentration of oxygen. An unidirectional increase of pressure to cathode oxygen will make the performance of DMFC become weak because the contact resistance will possibly become large. And the soaring but limited screw torque (tightness pressure) has a great influence on the performance of DMFC.
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