In this paper, a 16-cell direct methanol fuel cell (called DMFC) stack was developed to power or charge a mobile phone without any voltage transformer. The various types of the performance decay of DMFCs are studied before a 16-cell DMFC stack is made. The decays due to improper storage are found and avoided. The influences of the MEA treatments on the performance are also studied. Eventually, we try to find the best storage and treatment methods to keep stacks in a good condition all the way.
In order to solve the problem of methanol crossover lead to the cathode poisoned, it is necessary to operate under the proper methanol concentration and to discharge before finishing the whole experiment. It is also necessary to maintain MEAs in proper wetness so that the performance will not decline during storage. Additionally, the catalyst in the cathode will use Pt/Ru to replace Pt.
This 16-cell DMFC stack is composed of two 8-banded MEAs and 16 carbon fiber bunches. Each MEA is made with 8 sets of electrodes on a piece of membrane. The stack with 16 cells will be connected in series outside of the reaction chamber. The weight and volume of this 16-cell DMFC stack are 55 g (not including 20 c.c. methanol solution) and 99 cm3. The total electrode is 50 cm2 (16-cell¡Ñ3.15 cm2 per cell). The power at voltage 4V is 1680mW when it is operating at room temperature and air breathing. The maximum power density can reach 33 mW/cm2. The specific power density is 22 mW/g and the volumetric power density is 16.9 mW/cm3. This stack can power or charge a mobile phone directly.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0911109-150644 |
| Date | 11 September 2009 |
| Creators | Huang, Yu-wei |
| Contributors | Inn-chyn Her, Chong-u Liou, Long-Jeng Chen, Ming-San Lee, Peng-sheng Wei |
| 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-0911109-150644 |
| Rights | not_available, Copyright information available at source archive |
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