• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >In-plane transport effects on hydrogen depletion and carbon corrosion induced by anode flooding in proton exchange membrane fuel cells
【24h】

In-plane transport effects on hydrogen depletion and carbon corrosion induced by anode flooding in proton exchange membrane fuel cells

机译：质子交换膜燃料电池中面内输运对阳极溢流引起的氢耗竭和碳腐蚀的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Anode flooding is frequently encountered in proton exchange membrane fuel cells, which can induce local hydrogen starvation and subsequently result in carbon corrosion in catalyst layers. In this work, we develop a two-dimensional computational model and focus our attention on the mechanisms of hydrogen transport within the diffusion medium when part of the anode channel is clogged. In-plane convection is demonstrated to be the primary mechanism for hydrogen transport at the fringe of the flooded area. As the reactant flows deep inside, however, the dominating mechanism switches to diffusion due to nitrogen accumulation in the anode. Moreover, if hydrogen outside the flooded region is diluted with nitrogen, the length scale for hydrogen to deplete completely is reduced substantially, leading to an extension of the area suffering from hydrogen starvation and carbon corrosion. Meanwhile, the spatial distribution of carbon corrosion rate is emphasized in this work, and the effect of in-plane proton conduction is highlighted. This paper also sheds light on the maximum rate of carbon corrosion, which is demonstrated to be solely determined by oxygen crossover rate at high cell voltages, but is influenced by the kinetics of oxygen reduction reaction at low voltages.
机译：质子交换膜燃料电池中经常遇到阳极溢流，这可能引起局部氢饥饿，随后导致催化剂层中的碳腐蚀。在这项工作中，我们开发了一个二维计算模型，并将我们的注意力集中在当阳极通道的一部分被堵塞时氢在扩散介质中的传输机理。平面内对流被证明是在淹没区边缘的氢传输的主要机制。但是，随着反应物向内部深处流动，由于氮在阳极中的积累，主导机制切换为扩散。此外，如果用氮稀释淹没区域外部的氢，则氢完全耗尽的长度尺度会大大减小，从而导致遭受氢缺乏和碳腐蚀的区域扩大。同时，这项工作强调了碳腐蚀速率的空间分布，并突出了面内质子传导的影响。本文还阐明了最大的碳腐蚀速率，该速率被证明完全由高电池电压下的氧交换速率决定，但受低电压下氧还原反应的动力学影响。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第18期|p.4754-4765|共12页
  • 作者

    Xiao-Guang Yang; Qiang Ye; Ping Cheng;

  • 作者单位

    Ministry of Education Key Laboratory of Power Machinery and Engineering, School of Mechanical and Power Engineering, Shanghai Jiaotong University. Shanghai 200240, PR China;

    Ministry of Education Key Laboratory of Power Machinery and Engineering, School of Mechanical and Power Engineering, Shanghai Jiaotong University. Shanghai 200240, PR China;

    Ministry of Education Key Laboratory of Power Machinery and Engineering, School of Mechanical and Power Engineering, Shanghai Jiaotong University. Shanghai 200240, PR 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

    proton exchange membrane fuel cells; local hydrogen starvation; carbon corrosion; anode flooding; nitrogen dilution;

    机译：质子交换膜燃料电池;局部缺氢;碳腐蚀;阳极溢流;氮稀释;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号