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Simulation and Analysis on the Performance of Micro Direct Methanol Fuel Cell

Author: ZuoJun
Tutor: LiuXiaoWei
School: Harbin Institute of Technology
Course: Microelectronics and Solid State Electronics
Keywords: direct methanol fuel cell steady-state mathematical model simulation and analysis
CLC: TM911.4
Type: Master's thesis
Year: 2008
Downloads: 36
Quote: 0
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Abstract


Direct methanol fuel cell is the direct use of methanol as fuel, oxygen or air as an oxidant a fuel cell, having some advantages, such as clean, efficient, convenient and safe, which are suitable for notebook computers, mobile phones and other portable product and the small mobile electronics power supplying system. In order to better understand the processes and phenomena that determine the performance of a liquid feed DMFC, an isothermal, steady-state, mathematical model of DMFC is established.This paper reviews the model of direct methanol fuel cell at home and abroad, and describes the components of working mechanism and the establishment of the corresponding model. The diffusive mass flux of gas is described using the Maxwell-Stefan equation. The fluid flow in the anode channel is modeled with the momentum and continuity equations (the Navier-Stokes equations). The proton through the portentous electrodes can be described by Nernst-Plack equations. The fluid within portentous electrodes is described by modified Schlogl equations. The electrode reaction in the active catalyst layers are described by Butler-Volmer equations.In this paper, the flow microchannel of DMFC is simulated and analyzed which provides a reliable basis for designing flow channel. The performance of DMFC is simulated with different operating conditions. It is found that the performance of DMFC decrease as the operating temperature increase in the low current density. Moreover as the operating temperature increasing, the performance of DMFC also increases in the high current density. In cathode, the performance of DMFC increases as the operating pressure of outlet. The output power density is largest with the concentration of methanol at 2molL-1. The porosity of diffusion layer and catalyst layer has effects on the ultimate current density. Finally, theoretical results agree with the experimental data that verify the accuracy of the model.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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