In this thesis, a long-term operation direct methanol fuel cell (DMFC) stack with no performance decay is developed. In a passive DMFC, its performance will decay after a short period, if the weak methanol solution is supplied. Although the strong methanol solution may slightly increase the operating time, it tends to crossover leading to cathode Pt particle poisoned, and it is still unable to maintain long-term operation stably.
In our passive DMFC, there are two chambers in the anode. They are a pure methanol chamber and a 2~3M methanol solution chamber. By adjusting the diffusion gate outlet of the pure methanol chamber to control the diffusion rate of pure methanol, the appropriate pure methanol deliver to maintain methanol concentration in the anode reaction chamber stably.
If the anode reaction chamber is initially filled with 0.8 c.c., 3M methanol solution and without additional fuel supply, experimental results show that the performance of the DMFC begin decay after about 30 minutes. If the appropriate amount of methanol is supplied, the cell can maintain a long-term operation with no performance decay. The methanol concentration between 1.5 and 3M only has a little impact on the current output. Experimental results also show that the initial methanol concentration 2M is able to maintain a cell operation more stable than it in 3M. However, the initial methanol concentration and appropriate methanol supply is also important to maintain a DMFC for a long-term operation stably.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0906110-174341 |
| Date | 06 September 2010 |
| Creators | Chen, Chien-ming |
| Contributors | Peng-sheng Wei, Ming-San Lee, Long-Jeng Chen, Chung-Fu Liu |
| 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-0906110-174341 |
| Rights | not_available, Copyright information available at source archive |
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