Journal
JOURNAL OF POWER SOURCES
Volume 233, Issue -, Pages 259-268Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.01.059
Keywords
Cardo polyetherketone; Anion exchange membrane; Fuel cells; Solvent free; In situ bulk polymerization
Funding
- National Natural Science Foundation of China [21106140, 21025626, J1030412]
- National Basic Research Program of China [2012CB932800]
- National High Technology Research and Development Program 863 [2012AA03A608]
- Programs of Anhui Province for Science and Technology [11010202157]
- UK's Engineering and Physical Sciences Research Council [EP/I004882/1, EP/H025340/1]
- EPSRC [EP/I004882/1, EP/H025340/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I004882/1, EP/H025340/1] Funding Source: researchfish
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This article describes the preparation of cross-linked anion exchange membranes (AEMs) using a solvent free strategy. A novel casting solution is formed by dissolving cardo polyetherketone (PEK-C) as an essential polymer intensifier in a mixture of vinylbenzyl chloride (VBC) and divinylbenzene (DVB) monomers without any organic solvent. Tetraethylenepentamine (TEPA) is added to act as a crosslinker between VBC and PKE-C. Polymerization and quaternization are successively implemented to obtain the cross-linked AEMs, whose properties are found to compare well to many referenced AEMs. Apart from improving the compatibility of PEK-C with poly(VBC-co-DVB), TEPA also effectively enhances the charge density, ionic conductivity and alkaline stabilities of the resulting AEMs, whilst simultaneously inhibiting the swelling ratio. The optimal membrane shows an ionic conductivity of 76 mS cm(-1) at 70 degrees C and 100% relative humidity and can remain stable after immersing in 2 mol dm(-3) KOH solution for 168 h. A power density of 6 mW cm(-2) is achieved in a H-2/O-2 fuel cell test at 50 degrees C with an optimal AEM but a non-optimized membrane electrode fabrication process. Generally, the novel method herein highlights an environmentally friendly and economically attractive method for the preparation of AEMs used in alkaline fuel cells. (C) 2013 Elsevier B.V. All rights reserved.
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