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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of the cathode gas diffusion layer on the water transport behavior and the performance of passive direct methanol fuel cells operating with neat methanol
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Effect of the cathode gas diffusion layer on the water transport behavior and the performance of passive direct methanol fuel cells operating with neat methanol

机译：阴极气体扩散层对纯甲醇运行的被动式直接甲醇燃料电池的水传输行为和性能的影响

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摘要

The passive operation of a direct methanol fuel cell with neat methanol requires the water that is produced at the cathode to diffuse through the membrane to the anode to compensate the methanol oxidation reaction (MOR). Hence, the anode performance of this type of fuel cell can be limited by the water transport rate from the cathode to the anode. In this work we theoretically show that the water transport from the cathode to the anode depends primarily on the design of the cathode gas diffusion layer (GDL). We investigate experimentally the effects of the design parameters of the cathode GDL, including the PTFE (polytetrafluoroethylene) content in the backing layer (BL), and the carbon loading and the PTFE content in the microporous layer (MPL) on the water transport and the performance of the passive DMFC with the help of a reference electrode. The results indicate that on one hand, these parameters can be adjusted to decrease the water concentration loss of the anode performance, but on the other hand, they can also cause an increase in the oxygen concentration loss of the cathode performance. Hence, an optimal balance in minimizing the both concentration losses is the key to maximize the cell performance.
机译：直接甲醇燃料电池与纯甲醇的被动运行需要在阴极产生的水通过膜扩散到阳极，以补偿甲醇氧化反应（MOR）。因此，这种类型的燃料电池的阳极性能可能受到从阴极到阳极的水传输速率的限制。在这项工作中，我们从理论上表明水从阴极到阳极的传输主要取决于阴极气体扩散层（GDL）的设计。我们通过实验研究了阴极GDL设计参数的影响，包括衬里层（BL）中的PTFE（聚四氟乙烯）含量，微孔层（MPL）中的碳载量和PTFE含量对水的输送和吸收的影响。无源DMFC在参比电极的帮助下的性能。结果表明，一方面，可以调节这些参数以降低阳极性能的水浓度损失，但是另一方面，它们也可以导致阴极性能的氧浓度损失增加。因此，使两种浓度损失最小的最佳平衡是使电池性能最大化的关键。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第6期|p.1132-1143|共12页
  • 作者

    Q.X. Wu; T.S. Zhao; W.W. Yang;

  • 作者单位

    Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China;

    Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China;

    Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fuel cell; direct methanol fuel cell; passive operation; neat methanol operation;

    机译：燃料电池;直接甲醇燃料电池被动操作;纯甲醇操作;

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