Synthesis and properties of bonding layer containing flexible and fluorinated moieties for hydrocarbon-based membrane electrode assemblies

被引:11
作者
Nam, Soo-Whan [1 ,2 ]
Yu, Duk Man [1 ]
Kim, Tae-Ho [1 ]
Lee, Jang Yong [1 ]
Nam, Sang Yong [2 ]
Hong, Young Taik [1 ]
机构
[1] Korea Res Inst Chem Technol, Ctr Membranes, POB 107, Yuseong 305600, Daejeon, South Korea
[2] Gyeongsang Natl Univ, Dept Mat Engn, Jinju 660701, Gyeongnam, South Korea
基金
新加坡国家研究基金会;
关键词
Polymer electrolyte membrane; Bonding layer; Membrane electrode assembly; Sulfonated poly(arylene ether sulfone); Decal transfer method; POLY(ARYLENE ETHER SULFONE); PROTON-EXCHANGE MEMBRANES; FUEL-CELL APPLICATION; POLYMER ELECTROLYTE; ELECTROCHEMICAL PERFORMANCE; MULTIBLOCK COPOLYMERS; COMPOSITE MEMBRANE; CATALYST LAYER; FABRICATION; HYDROGEN;
D O I
10.1016/j.ijhydene.2016.04.174
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
For membrane electrode assemblies (MEAs) consisting of hydrocarbon proton exchange membranes (PEMs) and Nafion-coated catalysts, the interfacial incompatibility between the membrane and electrodes has been a constant issue because it can seriously deteriorate the performance and long term stability of the MEAs. In this study, new bonding materials based on sulfonated aromatic copolymers with flexible and partially fluorinated structures (SPE/F) were prepared and tested as a proton conductive bonding layer on the surface of the hydrocarbon PEMs to increase the adhesive force to the catalyst layer. The SPE/F copolymers were synthesized by polycondensation of sulfonated and non-sulfonated dihalide monomers with two dihydroxy monomers, 4,4'-dihydroxy diphenyl ether (DHDPE) and hexafluoro bisphenol A (HFB). The molar feed ratio of DHDPE to HFB was varied (10:0, 7:3, and 4:6) in order to evaluate the effect of the polymer structure on the physical, electrochemical, and adhesive properties. With an increase in the HFB ratio, the proton conductivity and dimensional change of the resulting polymers decreased due to the enhanced chain rigidity and lower ion exchange capacity. The maximum adhesive strength of the bonding layer was obtained using a DHDPE:HFB ratio of 7:3 (SPE/F-7/3). Finally, the MEA utilizing SPE/F-7/3 as the bonding layer exhibited higher performance in the initial unit cell test, as well as a reduced increase in resistance after the durability cycling test compared with pristine MEA without the bonding layer. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:10884 / 10895
页数:12
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