To ran a DMFC without methanol crossover is the aim of this study.It is done by supplying fuel no more than what the anode can consume.
The first is to explore the factors that may affect the time constant of vapor feed DMFC. In order to reduce the time constant of current decline, first, we decrease store tank¡¦s space of methanol with different structure of unipolar plate. Second, we reduce the thickness of anode stack and the space above the air bleed valve. Using slide plate instead of air bleed valve can shorten the diffuse distance effectively and reduce the time constant of current rise curve.
The second is to explore the impact of supply of methanol on steady-state current of system. Using air bleed valve, because of its high gas tightness, the utilization rate of methanol can exceed 94% without crossover. It was found that in the slide plant experiment, steady-state current value depends mainly on the pore size of slide plate, and resistance value has nothing to do. However, the resistance value is lower, the time required to reach steady-state current is shorter.
The third is to explore if the performance decay after long time test of steady-state current. It was found that the performance of MEA will decay while the water content of membrane decreased.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-1118110-172023 |
| Date | 18 November 2010 |
| Creators | Fong, Sheng-jie |
| Contributors | Peng-sheng Wei, Long-jheng Chen, Ming-san Li, Chong-fu Liou |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1118110-172023 |
| Rights | not_available, Copyright information available at source archive |
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