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Experimental Studies and Thermodynamic Analysis of Direct Methanol Fuel Cells Fed with High Concentration Methanol Solutions.

机译：用高浓度甲醇溶液喂养的直接甲醇燃料电池的实验研究和热力学分析。

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摘要

A direct methanol fuel cell (DMFC) uses methanol solutions as the fuel to generate electricity at near room temperature. Passive DMFCs are promising alternatives to rechargeable batteries as portable power supply systems due to the ease of handling and high theoretical specific energy of methanol (6.1 kWh kg-1). In order to obtain a satisfying performance, dilute methanol solutions (10 wt%) are typically used as fuel to minimize the methanol crossover through the electrolyte membrane. The specific energy of the fuel cell, however, is significantly decreased by using dilute methanol solutions. To take advantage of the high specific energy of methanol, DMFCs fed with high concentration methanol solutions, including pure methanol, have been investigated.;Both experiments and numerical simulations on thermal and mass transfer in DMFCs have been carried out to prevent severe methanol crossover and achieve stable fuel cell performance. First, water and methanol management systems in DMFCs were studied to understand mass transfer mechanisms. Principles to improve the species management have been suggested. Second, several innovative concepts were proposed, and experimentally tested, to significantly improve the energy density of the fuel cell. Finally, a passive, vapor-feed DMFC fed with pure methanol showed a similar performance to a conventional DMFC using a 10 wt% methanol solution. The calculated specific energy of the DMFC fed with pure methanol, 0.8 kWh (kg fuel)-1, was much higher than the theoretical specific energy of lithium-ion batteries, 0.4 kWh kg -1.
机译：直接甲醇燃料电池（DMFC）使用甲醇溶液作为燃料在接近室温的条件下发电。无源DMFC由于易于处理并且具有较高的甲醇理论比能（6.1 kWh kg-1），因此有望成为可充电电池的替代品，作为便携式电源系统。为了获得令人满意的性能，通常将稀甲醇溶液（<10 wt％）用作燃料，以最大程度地减少甲醇穿过电解质膜的渗透。然而，通过使用稀甲醇溶液，燃料电池的比能显着降低。为了利用甲醇的高比能，对含高浓度甲醇溶液（包括纯甲醇）的DMFC进行了研究。进行了DMFC中传热和传质的实验和数值模拟，以防止严重的甲醇交叉和实现稳定的燃料电池性能。首先，研究了DMFC中的水和甲醇管理系统，以了解传质机理。提出了改善物种管理的原则。其次，提出了几种创新概念并进行了实验测试，以显着提高燃料电池的能量密度。最后，用纯甲醇进料的被动式蒸汽进料DMFC与使用10 wt％甲醇溶液的常规DMFC表现出相似的性能。用纯甲醇进料的DMFC的计算比能为0.8 kWh（千克燃料）-1，远高于锂离子电池的理论比能0.4 kWh kg -1。

著录项

  • 作者

    Li, Xianglin.;

  • 作者单位

    University of Connecticut.;

  • 授予单位 University of Connecticut.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 301 p.
  • 总页数 301
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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