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Effect of hydrophobic additive on oxygen transport in catalyst layer of proton exchange membrane fuel cells

机译：疏水添加剂对质子交换膜燃料电池催化剂层中氧迁移的影响

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摘要

Oxygen transport resistance (OTR) is a critical factor influencing the performance of proton exchange membrane fuel cells (PEMFCs). In this paper, an effective method to reduce the OTR of catalyst layers (CLs) by introducing a hydrophobic additive into traditional CLs is proposed. A low-molecular-weight polytetrafluoroethylene (PTFE) is selected for its feasibility to prepare an emulsion, which is mixed with a traditional catalyst ink to successfully fabricate the CL with PTFE. of 10 wt%, The PTFE film exists in the mesopores between the carbon particles. The limiting current of the hydrophobic CL was almost 4000 mA/cm(2), which is 500 mA/cm(2) higher than that of the traditional CL. PTFE reduces the OTR of the CL in the dry region by as much as 24 s/m compared to the traditional CL and expands the dry region from 2000 mA/cm(2) in the traditional CL to 2500 mA/cm(2). Furthermore, the CL with the hydrophobic agent can improve the oxygen transport in the wet region ( 2000 mA/cm(2)) more effectively than that in the dry region. All these results indicate that the CL with the hydrophobic agent shows a superior performance in terms of optimizing water management and effectively reduces the OTR in PEMFCs.
机译：耐氧传输性（OTR）是影响质子交换膜燃料电池（PEMFC）性能的关键因素。本文提出了一种有效的方法，通过在传统的CLs中引入疏水性添加剂来降低催化剂层（CLs）的OTR。选择低分子量的聚四氟乙烯（PTFE）是因为它具有制备乳液的可行性，将其与传统的催化剂油墨混合以成功地用PTFE制造CL。当PTFE膜的含量为10wt％时，PTFE膜存在于碳颗粒之间的中孔中。疏水性CL的极限电流几乎为4000 mA / cm（2），比传统CL的极限电流高500 mA / cm（2）。与传统的CL相比，PTFE减少了CL在干燥区域的OTR高达24 s / m，并将干燥区域从传统CL的2000 mA / cm（2）扩大到2500 mA / cm（2）。此外，带有疏水剂的CL可以比干区更有效地改善湿区（> 2000 mA / cm（2））中的氧气传输。所有这些结果表明，具有疏水剂的CL在优化水管理方面显示出优异的性能，并有效降低了PEMFC中的OTR。

著录项

  • 来源
    《Journal of power sources》 |2018年第1期|338-343|共6页
  • 作者

    Wang Shunzhong; Li Xiaohui; Wan Zhaohui; Chen Yanan; Tan Jinting; Pan Mu;

  • 作者单位

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Hubei Prov Key Lab Fuel Cells, Wuhan 430070, Hubei, Peoples R China;

    Wuhan WUT New Energy Co Ltd, Wuhan 430070, Hubei, Peoples R China;

    Wuhan WUT New Energy Co Ltd, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Hubei Prov Key Lab Fuel Cells, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Hubei Prov Key Lab Fuel Cells, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Hubei Prov Key Lab Fuel Cells, Wuhan 430070, Hubei, Peoples R China;

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

    CL with hydrophobic agent; PTFE powder; Oxygen transport resistance; PEMFC;

    机译：带疏水剂的CL;PTFE粉末;耐氧传输性;PEMFC;

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