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Research Papers

A Novel Design of a Cylindrical Portable Direct Methanol Fuel Cell

[+] Author and Article Information
Ming-San Lee

Fuel Cell Laboratory, Department of Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424, R.O.C.mslee@mail.nsysu.edu.tw

Long-Jeng Chen, Min-Fa Hung, Ming-Yuan Lo, Shan-Jay Sue, Chin-Hung Lo, Yung-Pin Wang

Fuel Cell Laboratory, Department of Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424, R.O.C.

J. Fuel Cell Sci. Technol 5(3), 031004 (May 22, 2008) (8 pages) doi:10.1115/1.2894463 History: Received January 07, 2006; Revised June 04, 2007; Published May 22, 2008

Novel designs of a cylindrical and a flat portable direct methanol fuel cell (DMFC) have been proposed in this research. Experimental cells have also been fabricated. Their maximum power output reached 12mWcm2 when operating at room temperature and with naturally breathed air. The weight and the volume of the experimental cylindrical cell are 27g and 30cm3, respectively, with 7.5cm3 of methanol inside. Its specific power and volumetric power density are 6.67mWg and 6.25mWcm3, respectively. The membrane electrode assembly was fabricated by hot pressing the electrodes purchased from E-Tek Co. The catalyst contents are 4.0mgcm2 of PtRu (80wt.% carbon supported) and 4.0mgcm2 of Pt (black) for anode and cathode, respectively. The new and compact design will make the portable DMFC lighter and cheaper, and bring it one step closer to be marketable.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

“Banded” stacking methods: (a) banded structure and (b) banded structure stack with two membrane having four-cell units (bands) each (15)

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Figure 2

A curled banded MEA

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Figure 3

A carbon-fiber-made electron collector bunch with embedded conducting wires

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Figure 4

The fabrication processes of a carbon fiber bunch

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Figure 5

The contact resistance comparisons among graphite plate, stainless plate, and carbon fiber bunch

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Figure 6

The structure of the handmade cylindrical portable DMFC-a frame made of acrylic

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Figure 7

Schematic drawing of the new cylindrical portable PEMFC

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Figure 8

A handmade experimental cylindrical fuel cell

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Figure 9

The performance of the experimental cylindrical portable DMFC

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Figure 10

The performance of the experimental cylindrical portable HFC

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Figure 11

Schematic drawing of a banded flat-type stack (18)

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Figure 12

A handmade experimental portable flat fuel cell

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Figure 13

Schematic drawing of a “multiple-layer” banded-type stack

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