Journal
JOURNAL OF POWER SOURCES
Volume 279, Issue -, Pages 667-677Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.01.066
Keywords
Polyelectrolyte microcapsule; Ionic liquid; Composite membrane; Retention property; Anhydrous proton conductivity
Funding
- National Natural Science Foundation of China [21206151, U1407121]
- China Postdoctoral Science Foundation [2014T70687]
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Herein, novel composite membranes are prepared by embedding methacrylic acid polyelectrolyte microcapsules (PMCs) into sulfonated poly(ether ether ketone) (SPEEK) matrix, followed by impregnating imidazole-type ionic liquids (ILs). Within the composite membrane, the lumens of PMCs act as IL reservoirs, which provide large space for IL storage and thus significantly elevate the IL uptake. The IL leaching measurement suggests that the cross-linked shells of PMCs manipulate the IL release, endowing the composite membrane with high IL retention. Moreover, the high IL retention renders the composite membrane more anhydrous hopping sites (e.g., the imidazole groups on IL and the acid-base pairs between imidazole and sulfonic acid groups), imparting a facilitated proton conduction via Grotthuss mechanism. In particular, the composite membrane containing 12% PMCs achieves a high anhydrous proton conductivity of 33.7 mS cm(-1) at 150 degrees C. The same membrane also exhibits a surprising steady-state IL retention of 36.9% after leaching in liquid water. (C) 2015 Elsevier B.V. All rights reserved.
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