Issue 41, 2010
From the journal:

Journal of Materials Chemistry

Surface modification of heteropoly acid/SPEEKmembranes by polypyrrole with a sandwich structure for direct methanolfuelcells

Dan Xu,a   Gang Zhang,a   Na Zhang,a   Hongtao Li,a   Yang Zhang,a   Ke Shao,a   Miaomiao Han,a   Christopher M. Lewb  and  Hui Na*a  

* Corresponding authors

a Alan G. MacDiarmid Institute, College of Chemistry, Jilin University, Qianjin Street 2699#, Changchun, PR China
E-mail: huina@jlu.edu.cn
Fax: +86 431 85168870

b Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, USA

Abstract

A series of SPEEK/HPW/Ppy-n composite membranes with a sandwich structure were successfully prepared by surface modification with polypyrrole (Ppy) in order to stabilize phosphotungstic acid (HPW) in poly(ether ether ketone)s (SPEEKs) and reduce the methanol crossover. Ppy coatings with a large number of secondary ammonium groups (NH2+) interact with anions of HPW to decrease HPW leaching from the membrane. In addition, the hydrophobic Ppy layers allow for little methanol transport, which leads to a significant decline in methanol crossover with reasonable levels of proton conductivity. The properties of the membranes were investigated in detail by UV, SEM, ac impedance, and TGA. As observed, Ppy-modified membranes were better at immobilizing HPW and exhibited higher selectivities than previously reported SPEEK/HPW composite membranes. All the results indicate that the SPEEK/HPW/Ppy-n composite membranes are excellent candidates for direct methanol fuel cells.

Graphical abstract: Surface modification of heteropoly acid/SPEEK membranes by polypyrrole with a sandwich structure for direct methanol fuel cells

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Article information

DOI
https://doi.org/10.1039/C0JM02167A
Article type
Paper
Submitted
07 Jul 2010
Accepted
17 Aug 2010
First published
21 Sep 2010

J. Mater. Chem., 2010,20, 9239-9245

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Surface modification of heteropoly acid/SPEEK membranes by polypyrrole with a sandwich structure for direct methanol fuel cells

D. Xu, G. Zhang, N. Zhang, H. Li, Y. Zhang, K. Shao, M. Han, C. M. Lew and H. Na, J. Mater. Chem., 2010, 20, 9239 DOI: 10.1039/C0JM02167A

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