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Development of imidazolium-type alkaline anion exchange membranes for fuel cell application

Ran, J, Wu, L, Xu, T, Varcoe, JR, Ong, AL and Poynton, SD (2012) Development of imidazolium-type alkaline anion exchange membranes for fuel cell application Journal of Membrane Science, 415-41. 242 - 249. ISSN 0376-7388

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Abstract

This study reports the development of imidazolium-type alkaline anion exchange membranes (Im-AAEMs) based on the functionalization of bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) using 1-methylimdazole. Aromatic polymers bearing bromomethyl, instead of chloromethyl, functional groups were employed as base materials to avoid complicated chloromethylation which require toxic reagents. H NMR and FT-IR spectroscopic data indicated the synthesis of a series of membranes with controlled IECs (achieved by varying the amount of 1-methylimdazole). Due to the conjugated structures of imidazolium cations, the novel Im-AAEMs display enhanced short-term thermal and chemical stabilities compared with classical quaternary ammonium-type AAEMs. In addition, the imidazolium salts exhibit excellent solubility in polar solvents, such as NMP and DMSO, which allowed the exploitation of a pre-functionalized strategy for the synthesis of the AAEMs. Accordingly, the Im-AAEMs displayed conductivities up to >100mScm at 80°C, which derived from the establishment of a nano-scale phase-separated morphology as directed by the solvent casting process. A H /O fuel cell test yielded a peak power density of 30mWcm at a current density of 76mAcm ; this will be improved on development of a chemical compatible imidazolium-based alkaline ionomer for use as ionic polymer binder in the electrodes' catalyst layers. © 2012 Elsevier B.V.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Membrane Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Membrane Science, 415-416, October 2012, DOI 10.1016/j.memsci.2012.05.006.
Divisions: Faculty of Engineering and Physical Sciences > Chemistry
Depositing User: Symplectic Elements
Date Deposited: 09 Oct 2012 11:00
Last Modified: 23 Sep 2013 19:39
URI: http://epubs.surrey.ac.uk/id/eprint/722287

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