Sulfonated polysulfone with 1,3-1H-dibenzimidazole-benzene additive as a membrane for direct methanol fuel cells

被引：37

作者：

Fu, Yongzhu ^{[1
]}

Li, Wen ^{[1
]}

Manthiram, Arumugham ^{[1
]}

机构：

[1] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA

来源：

JOURNAL OF MEMBRANE SCIENCE | 2008年 / 310卷 / 1-2期

关键词：

direct methanol fuel cells; aromatic polymer membranes; proton conductivity; fuel cell performance; methanol crossover;

D O I：

10.1016/j.memsci.2007.10.050

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

1,3-1H-Dibenzimidazole-benzene (DBImBenzene) has been synthesized using phosphorus pentoxide-methanesulfonic acid (PPMA) as a solvent and dehydration agent and investigated as an additive (up to 2.0 wt.%) in sulfonated polysulfone (SPSf) membranes to promote proton conduction via acid-base interactions. The SPSf/DBImBenzene blend membranes with various DBImBenzene contents (0-2.0 wt.%) have been prepared and characterized by proton conductivity measurement and electrochemical polarization and methanol crossover measurements in direct methanol fuel cells (DMFCs). The blend membranes with DBImBenzene content of 0.5 and 1.0 wt.% show higher proton conductivities (3.4 and 2.9 x 10(-4) S/cm, respectively) than plain SPSf (2.4 x 10(-4) S/cm) even though the blend membranes have lower ion exchange capacity (0.81 and 0.75 mequiv./g, respectively) than plain SPSf (0.86mequiv./g). The blend membranes exhibit better electrochemical performance in DMFC than plain SPSf membrane due to an enhancement in proton conductivity through acid-base interactions and lower methanol crossover. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：262 / 267

页数：6

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