| Summary: | 碩士 === 淡江大學 === 航空太空工程學系碩士班 === 97 === The main objective of this paper is to apply the polydimethylsiloxane(PDMS) on a disc type direct methanol fuel cell(DMFC).There are two parts of this paper, the first part is to adopt the PDMS on a substitute material of the gasket and flow board. The performance of the DMFC with PDMS materials are compared with the DMFC which contains Teflon(PTFE) gaskets and acrylic flow boards. The effect of the surface treatment on the anode and cathode flow boards is also studied.
The second part of this paper is to apply the PDMS materials on the design and fabrication of the disc type DMFC .The current collectors are bounded with a circular PDMS thin film before the DMFC assembly. Then the anode and cathode flow boards and the PDMS thin film with current collectors are assembled together. A single layer disc type DMFC with 3 MEAs is designed and fabricated first. The performances of the individual cell and overall DMFC module are measured. The effect of the screw torque is also discussed. Furthermore, a double-layer disc type DMFC with 3 MEAs at each layer is designed and fabricated. The performances of individual cell as well as overall DMFC module are also measured. At the end of this thesis, the developed double–layers DMFC is combined with one liquid pump, one air pump, and a DC-DC converter to accomplish as a small portable charger.
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