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RESEARCH PAPERS

Dynamic Characteristics of a Direct Methanol Fuel Cell

[+] Author and Article Information
Maohai Wang1

Enhanced Heat Transfer and Energy Conservation Key Lab of Ministry of Education, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China and Heat Transfer and Energy Conversion Key Lab of Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China

Hang Guo, Chongfang Ma

Enhanced Heat Transfer and Energy Conservation Key Lab of Ministry of Education, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China and Heat Transfer and Energy Conversion Key Lab of Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China

1

Corresponding author. e-mail: maohaiwang@gmail.com

J. Fuel Cell Sci. Technol 3(2), 202-207 (Oct 19, 2005) (6 pages) doi:10.1115/1.2174070 History: Received August 11, 2005; Revised October 19, 2005

The detailed dynamic characteristics of direct methanol fuel cells need to be known if they are used for transportable power sources. The dynamic response of a direct methanol fuel cell to variable loading conditions, the effect of cell temperature and oxygen flow rate on the cell response, and the cell response to continuously varying cell temperatures were examined experimentally. The results revealed that the cell responds rapidly to variable current cycles and to continuously varying cell temperatures. The increasing rate of gradual loading significantly influences the dynamic behavior. The effects of cell temperature and oxygen flow rate on the cell dynamic responses are considerable, but the cell voltage differences over the range of cell temperatures and oxygen flow rates are small for gradual loading. The cell response value to cell temperature during decreasing temperature is lower than that during increasing temperature.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Test rig of liquid-feed direct methanol fuel cell

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Figure 2

The influence of constant loading period on cell voltage response under pulsated loading

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Figure 3

Effect of increasing/decreasing loading slope on the cell voltage response

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Figure 4

Cell voltage response under trapeziform current loading

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Figure 5

Cell voltage response to an instantaneous loading followed by gradual unloading

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Figure 6

The effect of cell temperature on the voltage response under variable loads

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Figure 7

The effect of oxygen flux on the voltage response under variable loads

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Figure 8

Cell open circuit voltage response to continue change of cell temperature

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Figure 9

Cell response to continue change of cell temperature under constant voltage of 0.2V

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