Mathematical Model of a Direct Methanol Fuel Cell

[+] Author and Article Information
Brenda L. García, Vijay A. Sethuraman, John W. Weidner, Ralph E. White

 Center for Electrochemical Engineering, Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208

Roger Dougal

 Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208

J. Fuel Cell Sci. Technol 1(1), 43-48 (Jun 15, 2004) (6 pages) doi:10.1115/1.1782927 History: Received April 16, 2004; Revised June 15, 2004

A one-dimensional, isothermal model for a direct methanol fuel cell (DMFC) is presented. This model accounts for the kinetics of the multi-step methanol oxidation reaction at the anode. Diffusion and crossover of methanol are modeled and the mixed potential of the oxygen cathode due to methanol crossover is included. Kinetic and diffusional parameters are estimated by comparing the model to data from a 25cm2 DMFC. This semi-analytical model can be solved rapidly so that it is suitable for inclusion in real-time system level DMFC simulations.

Copyright © 2004 by American Society of Mechanical Engineers
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Figure 1

Schematic of a DMFC

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Figure 2

Reaction pathways of methanol oxidation (5)

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Figure 3

Schematic of the DMFC layers considered in the model

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Figure 4

Model predictions for different methanol concentrations

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Figure 5

Concentrations profiles for different methanol bulk concentrations

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Figure 6

Methanol crossover for different methanol bulk concentrations



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