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Degradation of polymer electrolyte membrane fuel cell by siloxane in biogas

机译:沼气中硅氧烷对高分子电解质膜燃料电池的降解

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摘要

We studied the degradation and durability of polymer electrolyte membrane fuel cell (PEMFC) at membrane-electrode-assembly (MEA) level by injection of octamethylcyclotetrasiloxane (D4) as a representative siloxane, which has been found in many industrial and personal products. Specifically, i) GC/MS analysis demonstrated that the ring-opening polymerization of D4 could result in the formation of various linear and cyclic siloxanes in both electrodes of MEA; ii) post-test analysis revealed that the transformed siloxanes were transported from the anode to the cathode via free-volumes in the polymer membrane; iii) RDE measurement and DFT calculation revealed that D4 was not directly responsible for the electrocatalytic activity of Pt; iv) electrochemical analysis demonstrated that the residual methyl groups of siloxane and various siloxanes did not hinder the proton transport in the polymer membrane; and v) siloxanes accumulated in the primary and secondary pores with the exception of an external surface of carbon, causing an increase in the oxygen reactant's resistance and resulting in a decrease of the cell performance. In addition, we confirmed that injection of D4 did not affect the carbon corrosion adversely because the siloxane had little influence on water sorption in the catalyst layer. (C) 2016 Elsevier B.V. All rights reserved.
机译:我们通过注射八甲基环四硅氧烷(D4)作为代表硅氧烷研究了高分子电解质膜燃料电池(PEMFC)在膜电极组件(MEA)级别上的降解和耐久性,这已在许多工业和个人产品中发现。具体而言,i)GC / MS分析表明,D4的开环聚合可导致在MEA的两个电极中形成各种线性和环状硅氧烷; ii)测试后分析表明,转化后的硅氧烷通过聚合物膜中的自由体积从阳极转移到阴极; iii)RDE测量和DFT计算表明D4并不直接影响Pt的电催化活性; iv)电化学分析表明,硅氧烷和各种硅氧烷的残留甲基不妨碍质子在聚合物膜中的传输; v)除了碳的外表面以外,聚硅氧烷在第一孔和第二孔中积聚,导致氧反应物的电阻增加,导致电池性能下降。此外,我们确认注入D4不会对碳腐蚀产生不利影响,因为硅氧烷对催化剂层中的水吸附几乎没有影响。 (C)2016 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Journal of power sources》 |2016年第1期|44-52|共9页
  • 作者单位

    Korea Inst Energy Res, Hydrogen & Fuel Cell Ctr, Seoul, South Korea|Chonbuk Natl Univ, Dept Energy Storage & Convers Engn, Jeonju, South Korea;

    Korea Inst Energy Res, Hydrogen & Fuel Cell Ctr, Seoul, South Korea;

    Korea Inst Energy Res, Fuel Cell Res Ctr, Chonbuk, South Korea;

    Korea Inst Energy Res, Hydrogen & Fuel Cell Ctr, Seoul, South Korea;

    Korea Inst Energy Res, Hydrogen & Fuel Cell Ctr, Seoul, South Korea|Yonsei Univ, Dept Chem & Biomol Engn, Seoul 120749, South Korea;

    Korea Inst Energy Res, Hydrogen & Fuel Cell Ctr, Seoul, South Korea|Yonsei Univ, Dept Chem & Biomol Engn, Seoul 120749, South Korea;

    Korea Inst Energy Res, Hydrogen & Fuel Cell Ctr, Seoul, South Korea|Chonbuk Natl Univ, Dept Energy Storage & Convers Engn, Jeonju, South Korea;

    Korea Inst Energy Res, Hydrogen & Fuel Cell Ctr, Seoul, South Korea;

    Korea Basic Sci Inst, Div Electron Microscop Res, Daejeon, South Korea;

    Chonbuk Natl Univ, Dept Energy Storage & Convers Engn, Jeonju, South Korea;

    Korea Inst Energy Res, Hydrogen & Fuel Cell Ctr, Seoul, South Korea;

    Korea Inst Energy Res, Hydrogen & Fuel Cell Ctr, Seoul, South Korea;

  • 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

    Polymer electrolyte membrane fuel cell (PEMFC); Biogas; Siloxane; Octamethylcyclotetrasiloxane (D4);

    机译:聚合物电解质膜燃料电池(PEMFC);沼气;硅氧烷;十甲基环四硅氧烷(D4);
  • 入库时间 2022-08-18 00:22:17

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