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RESEARCH PAPERS

Design and Performance Analysis of Innovative Bipolar Direct Methanol Fuel Cell Stacks with 2D Planar Configuration

[+] Author and Article Information
Guo-Bin Jung1

Fuel Cell Centerbin@saturn.yzu.edu.tw

Fang-Bor Weng, Ay Su, Shih-Hung Chan

Fuel Cell Center and Department of Mechanical Engineering, Yuan Ze University, Chung-Li, Taoyuan 32026, Taiwan

Chen-Chung Chung, Cheng-Hsin Tu

Department of Mechanical Engineering, Yuan Ze University, Chung-Li, Taoyuan 32026, Taiwan

1

To whom correspondence should be addressed.

J. Fuel Cell Sci. Technol 3(1), 8-12 (Aug 19, 2005) (5 pages) doi:10.1115/1.2133800 History: Received April 06, 2004; Revised August 19, 2005

In this study, an innovative planar stack design employing graphite plate with bipolar structure on the same side to replace current stainless steel is investigated. The design, fabrication, and performance evaluation of a 25cm2, air-breathing, room-temperature, direct methanol fuel cell are described. The cell is completely passive with external pumps for controlling the methanol flow rate. This planar design consists of an open cathode side which allows a completely passive, self-breathing operation of the stack. Single cells with active area of 25cm2 showed a maximum power density of 2540mW. A three-cell stack was constructed in an innovative planar configuration and it produced a power output of 110mW at 3M of methanol concentration at room temperature. In addition, the performance gives rise to 280mW at 3M under air-forced mode. The more concentrated methanol solution attains higher power due to instant take away of the methanol crossover through the membrane while the oxygen within the air is ready to react with the proton from the membrane with an appropriate rate and current output.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Construction principles of planar stack: (a) traditional design; (b) innovative design

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Figure 2

Planar three-cell stack with air-breathing

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Figure 3

Polarization characters of three individual cells

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Figure 4

Polarization characters of single-, two-, and three-cell stacks

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Figure 5

Effect of the methanol concentration on the performance of DMFC stack

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Figure 6

Effect of the temperature on the performance of DMFC stack

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Figure 7

Planar three-cell stack with air-forced mode

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Figure 8

Effect of the methanol concentration on the performance of planar three-cell stack with air-forced mode

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