Journal
JOURNAL OF POWER SOURCES
Volume 194, Issue 1, Pages 168-174Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.05.021
Keywords
Sulfonated poly(arylene ether ketone); Proton-exchange membrane; Layer-by-layer; Chitosan; Phosphotungstate
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Layer-by-layer (LBL) self-assembly is a simple and elegant method of constructing organic-inorganic composite thin films from environmentally benign aqueous solutions. In this paper, we utilize this method to develop proton-exchange membranes for fuel cells. The multilayer film is constructed onto the surface of sulfonated poly(arylene ether ketone) (SPAEK-COOH) membrane by LBL self-assembly of polycation chitosan (CTS) and negatively charged inorganic particle phosphotungstic acid (VIA). The highly conductive inorganic nanoparticles ensure SPAEK-COOH-(CTS/PTA)(n) membranes to maintain high proton conductivity values up to 0.086 S cm(-1) at 25 degrees C and 0.24S cm(-1) at 80 degrees C, which are superior than previous LBL assembled electrolyte systems. These multilayer systems also exhibit extremely low water swelling ratio and methanol permeability. The selectivity of SPAEK-COOH-(CTS/PTA)(8) is 2 orders of more than Nafion (R) 117, which is attractive in direct methanol fuel cells (DMFCs). (C) 2009 Elsevier B.V. All rights reserved.
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