Alkali resistant and conductive guanidinium-based anion-exchange membranes for alkaline polymer electrolyte fuel cells
Lin, X, Wu, L, Liu, Y, Xu, T, Ong, AL, Poynton, SD and Varcoe, JR (2012) Alkali resistant and conductive guanidinium-based anion-exchange membranes for alkaline polymer electrolyte fuel cells Journal of Power Sources, 217 . 373 - 380. ISSN 0378-7753
Available under License : See the attached licence file.
Official URL: http://dx.doi.org/10.1016/j.jpowsour.2012.05.062
Novel alkaline anion-exchange membranes (AAEMs) containing pendant guanidinium groups are synthesized from poly(2, 6-dimethyl-1,4-phenylene oxide) (PPO) by benzyl bromination and subsequent reaction with 1,1,2,3,3-pentamethylguanidine (PMG). The performances of the resultant guanidinium-functionalized-PPO (GPPO) AAEMs are controlled by tailoring the amount of guanidinium groups in the membrane matrix. The AAEMs exhibit high ionic conductivities (up to 71 mS cm at room temperature); this stems from the high alkalinity (high pK ) of guanidinium hydroxide, which leads to an augmentation of both the number of dissociated hydroxides and water molecules. Furthermore, the GPPO AAEMs exhibit excellent thermal and alkali stabilities due to the presence of the π electron conjugated systems of the pendant guanidinium head-groups permitting the positive charge to be delocalized over one carbon and three nitrogen atoms. Specifically, the initial decomposition temperatures, from thermogravimmetric analyses of the GPPO AAEMs, are high at 270 °C, while the hydroxide conductivity of the AAEM with the most optimal properties remains stable in aqueous KOH (1 mol dm ) solution for 192 h at 25 °C. A H /O fuel cell test at 50 °C with a GPPO AAEM yielded a beginning-of-life peak power density of 16 mW cm . © 2012 Elsevier B.V.
|Additional Information:||NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Power Sources. 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 Power Sources, 217, November 2012, DOI 10.1016/j.jpowsour.2012.05.062.|
|Divisions:||Faculty of Engineering and Physical Sciences > Chemistry|
|Deposited By:||Symplectic Elements|
|Deposited On:||23 Oct 2012 11:36|
|Last Modified:||11 May 2013 14:36|
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