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Alkaline polymer electrolytes containing pendant dimethylimidazolium groups for alkaline membrane fuel cells

Lin, X, Liang, X, Ong, AL, Ran, J, Li, Y, Xu, T, Varcoe, JR and Poynton, SD (2013) Alkaline polymer electrolytes containing pendant dimethylimidazolium groups for alkaline membrane fuel cells Journal of Materials Chemistry A, 1 (24). pp. 7262-7269.

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Abstract

Novel anion exchange membranes (AEMs), based on poly(phenylene oxide) (PPO) chains linked to pendant 1,2-dimethylimidazolium (DIm) functional groups, have been prepared for evaluation in alkaline polymer electrolyte membrane fuel cells (APEFCs). Successful functionalisation of the PPO chains was confirmed using H-NMR and FT-IR spectroscopies. The ionic conductivities of the resulting DIm-PPO AEMs at 30 °C are in the ranges of 10-40 mS cm and 18-75 mS cm at 60 °C. The high ionic conductivities are attributed to the highly developed microstructures of the membranes, which feature well-defined and interconnected ionic channels (confirmed by atomic force microscopy, AFM, measurements). Promisingly, the ion-exchange capacities (IECs) of the DIm-PPO AEM are maintained after immersion in an aqueous KOH solution (2 mol dm) for 219 h at 25 °C; a previously developed monomethyl imidazolium PPO analogue AEM (Im-PPO) showed a significant decline in IEC on similar treatment. This reduction in undesirable attack by the OH conducting anions is ascribed to an increase in steric interference and removal of the acidic C2 proton [in the monomethyl Im-groups] by the methyl group in the DIm cationic ring. Moreover, the maximum power densities produced in simple beginning-of-life single cell H /O fuel cell tests increased from 30 mW cm to 56 mW cm when switching from the Im-PPO AEM (fuel cell temperature = 50 °C) to the DIm-PPO-0.54 AEM (fuel cell temperature = 35 °C) respectively (even with the use of lower temperatures). This journal is © The Royal Society of Chemistry 2013.

Item Type: Article
Authors :
NameEmailORCID
Lin, XUNSPECIFIEDUNSPECIFIED
Liang, XUNSPECIFIEDUNSPECIFIED
Ong, ALUNSPECIFIEDUNSPECIFIED
Ran, JUNSPECIFIEDUNSPECIFIED
Li, YUNSPECIFIEDUNSPECIFIED
Xu, TUNSPECIFIEDUNSPECIFIED
Varcoe, JRUNSPECIFIEDUNSPECIFIED
Poynton, SDUNSPECIFIEDUNSPECIFIED
Date : 28 June 2013
Identification Number : 10.1039/c3ta10308k
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 13:48
Last Modified : 31 Oct 2017 15:06
URI: http://epubs.surrey.ac.uk/id/eprint/782999

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