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Anion-exchange membranes for alkaline polymer electrolyte fuel cells: Comparison of pendent benzyltrimethylammonium- and benzylmethylimidazolium-head- groups

Deavin, OI, Murphy, S, Ong, AL, Poynton, SD, Herman, H, Varcoe, JR, Zeng, R and Herman, H (2012) Anion-exchange membranes for alkaline polymer electrolyte fuel cells: Comparison of pendent benzyltrimethylammonium- and benzylmethylimidazolium-head- groups Energy and Environmental Science, 5 (9). pp. 8584-8597.

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Abstract

Radiation-grafted alkaline anion-exchange membranes (AAEM) containing pendent groups with either benzyltrimethylammonium (BTM) or benzylmethylimidazolium (BMI) functionality were successfully synthesised from the same base membrane and with identical ion-exchange capacities. The conductivity of the new BMI-AAEM is comparable to the BTM-benchmark AAEM. The fuel cell performance obtained with the BMI-AAEM was, however, significantly poorer due to in situ AAEM degradation. FT-Raman spectroscopic studies on the stability of the two head-groups at 60°C in aqueous potassium hydroxide (1 mol dm ) indicates that the BMI-group is intrinsically less chemically stable in strongly alkaline conditions compared to the BTM-benchmark head-group. However, the stabilities of both head-groups are improved when treated at 60°C in lower pH aqueous carbonate and bicarbonate solutions (1 mol dm ). Contrary to a portion of the prior literature, there appears to be no real advantage in using anion-exchange polymer electrolytes containing pendent imidazolium groups in highly alkaline systems. © 2012 The Royal Society of Chemistry.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
AuthorsEmailORCID
Deavin, OIUNSPECIFIEDUNSPECIFIED
Murphy, SUNSPECIFIEDUNSPECIFIED
Ong, ALUNSPECIFIEDUNSPECIFIED
Poynton, SDUNSPECIFIEDUNSPECIFIED
Herman, HUNSPECIFIEDUNSPECIFIED
Varcoe, JRUNSPECIFIEDUNSPECIFIED
Zeng, RUNSPECIFIEDUNSPECIFIED
Herman, HUNSPECIFIEDUNSPECIFIED
Date : September 2012
Identification Number : 10.1039/c2ee22466f
Additional Information : Copyright 2012 Royal Society of Chemistry
Depositing User : Symplectic Elements
Date Deposited : 25 Jan 2013 10:26
Last Modified : 14 Nov 2014 16:33
URI: http://epubs.surrey.ac.uk/id/eprint/745480

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