Modeling Investigation into Effects of Diffusion and Catalyst Layers on Performance of Direct Methanol Fuel Cell

苗政 1; 何雅玲 1; 李相霖 1; 2; 李小跃 1; 2

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Modeling Investigation into Effects of Diffusion and Catalyst Layers on Performance of Direct Methanol Fuel Cell

更新时间：2025-12-08

- Modeling Investigation into Effects of Diffusion and Catalyst Layers on Performance of Direct Methanol Fuel Cell
- Vol. 42, Issue 7, Pages: 925-930(2008)
- 作者机构：
  
  1. 西安交通大学动力工程多相流国家重点实验室,西安,710049
  2. 西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM911.4
- Online First：10 July 2008，
  
  Published：2008
- 稿件说明：
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苗政 1, 何雅玲 1, 李相霖 1, et al. Modeling Investigation into Effects of Diffusion and Catalyst Layers on Performance of Direct Methanol Fuel Cell[J]. 2008, 42(7): 925-930.
DOI：

苗政 1, 何雅玲 1, 李相霖 1, et al. Modeling Investigation into Effects of Diffusion and Catalyst Layers on Performance of Direct Methanol Fuel Cell[J]. 2008, 42(7): 925-930. DOI：

摘要

为了考察直接液体甲醇燃料电池(DMFC)中扩散层和催化层的结构参数对电池性能的影响

建立了二维、单相、全电池模型.模型中综合考虑了电化学动力学、水动力学、化学反应和各种组分传递的耦合过程以及甲醇窜流在阴极形成的寄生电流

对阳极催化层和阴极催化层传质过程引入了团聚块模型进行修正.利用此模型

通过自主开发的计算程序

计算了扩散层、催化层的厚度和孔隙率对电池输出性能及甲醇窜流的影响.计算结果表明:相对于催化层而言

电池性能在更大程度上依赖于扩散层的参数.在不同的电池输出电流密度下

扩散层厚度对电池输出性能有不同的影响趋势

应在考虑其他参数的基础上选择合适的扩散层厚度

以获得较优的电池输出性能.大的孔隙率可减小传质阻力

但在提高电池输出性能的同时会加重甲醇窜流.

Abstract

A two-dimensional single phase full cell model for a direct methanol fuel cell(DMFC)is developed to investigate the effects of structure parameters

such as the porosity of diffusion layer(DL)and catalyst layer(CL)

and the width of DL and CL

on cell performance and methanol crossover rate. In this model

the electrochemical kinetics

hydrodynamics

fluid flow and methanol crossover are considered. The agglomerate models are utilized for both anode catalyst layer and cathode catalyst layer to modify the methanol oxidation reaction kinetics and the oxygen reduction reaction kinetics. A program based on the finite volume method is coded to solve the equations

and the results show that the cell performance depends strongly on the parameters of DLs rather than CLs. The trend in the effects of DL width is reversed for different cell current density. Although a higher porosity of DL and CL leads to a better cell performance

the methanol crossover becomes heavier.

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Keywords

references

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KULIKOVSKY A A. Two-dimensional numerical modeling of a direct methanol fuel cell [J]. J Appl Electrochem, 2000, 30(9): 1005-1014.

WANG Z H, WANG C Y. Mathematical modeling of a liquid-feed direct methanol fuel cells [J]. J Electrochem Soc, 2003, 150(4): A508-A519.

YANG W W, ZHAO T S. A two-dimensional, two-phase mass transport model for liquid-feed DMFCs [J]. Electrochim Acta, 2007, 52(20): 6125-6140.

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西安交通大学热流科学与工程教育部重点实验室，710049，西安MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China

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