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TECHNICAL PAPERS

Numerical Analysis of Current Distribution at Proton Exchange Membrane Fuel Cell Compared by Segmented Current Collector Cell

[+] Author and Article Information
Kazuo Onda1

Department of Electrical and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tenpaku, Toyohashi, Aichi 441-8580, Japanonda@eee.tut.ac.jp

Takuya Taniuchi, Takuto Araki, Daisuke Sunakawa

Department of Electrical and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tenpaku, Toyohashi, Aichi 441-8580, Japan

1

Corresponding author.

J. Fuel Cell Sci. Technol 4(4), 441-449 (Jun 05, 2006) (9 pages) doi:10.1115/1.2759506 History: Received November 30, 2005; Revised June 05, 2006

In order to grasp properly proton exchange membrane fuel cell (PEMFC) power generation performances, it is necessary to know factors for water management such as diffusivity and electro-osmotic coefficient of water vapor through the membrane and factors for power loss such as active and resistive overpotentials. In this study, we have measured these factors to analyze our experimental results of PEMFC power generation tests by using our pseudo-two-dimensional simulation code. It considers simultaneously the mass, charge and energy conservation equations, and the equivalent electric circuit for PEMFC to give numerical distributions of hydrogen/oxygen concentrations, current density, and gas/cell-component temperatures. Various experimental conditions such as fuel and oxygen utilization rates, inlet dew-point temperature, averaged current density, and flow configuration (co- or counterflow) were changed, and all of the numerical distributions of current density agreed well with the measured distributions by segmented current collector. The current distributions were also obtained from hydrogen/oxygen concentration changes along the gas flow measured by gas chromatography. The current distributions measured by the two different methods coincided with each other, showing reliability of our measurement methods.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 11

Equivalent electric circuit for PEMFC

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Figure 12

Comparison between measured and numerical current distributions (Tcell=60°C, TDPa=TDPc=59°C, H2=O2=300cm3∕min, coflow)

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Figure 6

Electro-osmotic coefficient nd against temperature and relative humidity

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Figure 5

Change of diffusion coefficient DMEA by temperature Tcell and relative humidity

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Figure 3

A relation between Rh(v) and gas flow rate

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Figure 1

Experimental apparatus

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Figure 17

Comparison between measured and numerical current distributions (Tcell=60°C, TDPa=TDPc=30°C, H2=O2=40cm3∕min, counterflow)

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Figure 13

Comparison between measured and numerical current distributions (Tcell=60°C, TDPa=TDPc=30°C, H2=100cm3∕min, O2=300cm3∕min, coflow)

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Figure 10

Measured current distributions by two methods

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Figure 9

Configuration of cell and segmented current collector cell

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Figure 8

Change of activation overpotential by current density, oxygen concentration, and cell temperature

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Figure 7

Change of membrane resistance by temperature and relative humidity

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Figure 14

Comparison between measured and numerical current distributions (Tcell=60°C, TDPa=TDPc=30°C, H2=O2=40cm3∕min, coflow)

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Figure 15

Comparison between measured and numerical current distributions (Tcell=60°C, TDPa=TDPc=59°C, H2=40cm3∕min, O2=100cm3∕min, coflow)

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Figure 4

Change of diffusion coefficient DDIF by temperature Tcell and relative humidity

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Figure 16

Comparison between measured and numerical current distributions (Tcell=60°C, TDPa=TDPc=30°C, H2=100cm3∕min, O2=300cm3∕min, counterflow)

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Figure 2

Transport model of water vapor in PEMFC

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