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Design Innovation

Design and Performance Test of the Direct Methanol Fuel Cell System

[+] Author and Article Information
Shinn-Dar Wu1

Department of Mechanical Engineering, National Chiao Tung University, HsinChu, Taiwan 300, R.O.C.sd9514812.me95g@nctu.edu.tw

Chang-Pin Chou

Department of Mechanical Engineering, National Chiao Tung University, HsinChu, Taiwan 300, R.O.C.

Ay Su

Department of Mechanical Engineering, Yuan Ze University, Chung-Li, Taiwan 32003, R.O.C.

Jenn-Jiang Hwang

Department of Greenergy Technology, National University of Tainan, Tainan 700, Taiwan, R.O.C.

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(2), 025001 (Nov 22, 2010) (8 pages) doi:10.1115/1.4002582 History: Received April 10, 2008; Revised August 25, 2010; Published November 22, 2010; Online November 22, 2010

This paper aims to analyze the membrane electrode assembly (MEA) of the direct methanol fuel cell (DMFC) in order to provide a reference for the design of DMFC. The slow kinetics of methanol oxidation and whether the anode should be hydrophobic or hydrophilic were seldom discussed in previous research. Therefore, this paper focuses on the electrode of the anode. The anodic gas diffusion layer (GDL) is treated with different hydrophilic degrees. Then, the microstructure of GDL is examined using SEM. The water content and water droplet contact angle of GDL were measured. The results are then compared with each other to determine the optimal treatment procedure of the anode. The second part of this paper proposed a new design of the DMFC system. After choosing the appropriate MEAs for the DMFC stack, the stack was combined with the water circulatory system, air circulatory system, and electricity controller to complete the DMFC system. The efficiency of the whole system is discussed.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Process procedure

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Figure 2

System circulation diagram: air circulation direction shown as blue, and methanol circulation direction shown as red

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Figure 3

Internal circulation system image

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Figure 4

Circulation system internal control diagram

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Figure 5

Circulation system control internal image

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Figure 6

Schematic of scraper

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Figure 7

Schematic of single cell configuration diagram

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Figure 8

Methanol-water flow field

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Figure 10

Structure of cooper tinsel on rib

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Figure 11

Planar fuel cell assembly configuration

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Figure 12

Planar fuel cell image shot

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Figure 13

Fuel cell connection diagram

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Figure 14

I-V curve (gas: H2/O2; P: back pressure (kPa); F: flow (SCCM))

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Figure 15

I-V curve (gas: H2/air; P: back pressure (kPa); F: flow (SCCM))

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Figure 16

I-V curve of renewed processing method methanol under various temperature; 941027 is GDL-0, 950111 is GDL-4; P: back pressure (kPa); F: flow (SCCM)

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Figure 17

GDL water content diagram

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Figure 18

Hydrophilia and nonhydrophilia comparison

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Figure 19

Thickness measuring under constant voltage experiment data comparison

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Figure 20

Four probe method measuring in plane resistivity comparison

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Figure 21

Methanol concentration suitable for DMFC diagram

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Figure 22

Anode through H2SO4 processing diagram using water pump and air pump in system P: back pressure (kPa); F: flow (SCCM)

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Figure 23

System I-V curve diagram

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Figure 24

System and single cell I-V curve performance comparison

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Figure 25

Single cell and system I-V curve performance comparison

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Figure 26

Motor driving voltage variation

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Figure 27

Motor driving and operating power

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Figure 28

Motor durability test variation and fail diagram

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