2005 Fiscal Year Final Research Report Summary
Development of Wick Type Cell Structure for Direct Dimetylether Fuel Cell
| Project/Area Number |
16560172
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Ibaraki University |
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Principal Investigator |
HARAGUCHI Tadao Ibaraki University, College of Engineering, Associate Professor, 工学部, 助教授 (00091728)
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| Project Period (FY) |
2004 – 2005
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| Keywords | DME / Fuel Cell / Wick Cell Type / Separator / MEA |
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| Research Abstract |
Until now, research of direct dimetylether fuel cell (DDFC), gases used for it have been needed to be humidified over 100%R.H. because the water molecules have been used on the anode electrode to generate electricity. But to excessively supply water in a cell have occurred flooding. Also, because cell temperature distribution perhaps has not uniformed during generation of electricity, electrolyte membrane has been dry at high temperature regions, and water droplets have accumulated in the separator ducts at low temperature regions.
Then, in this study, wicks that have a capillary force have been inserted to the anode and cathode separator ducts. Results got have been summarized, and they have been shown in the following.
(1) In the DME gas supply test, the I-V performance with the wicks has not improved.
(2) In the DMEaq supply test, with the wicks, the maximum power density has not improved, but limiting current density has improved.
(3) In the DME gas and liquid water supply test, internal resistance with the wicks has reduced at the cathode oxygen flow rate 200ml/min.
(4) In the pressure drop distribution test using DME gas as the anode fuel, pressure drop in the all the sections have increased as the current has increased.
(5) In the pressure drop distribution test using hydrogen gas as the anode fuel, pressure drop in the all the sections have decreased as the current has increased.
(6) We make the visualization cell. Which we can observe the cell watercourse directly. We try to observe the electrode surface in the power generation of DDFC. We can confirm the first time dew condensation in the watercourse center edge cathode plane at 0.12A/cm^2.
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