Journal
SOLID STATE IONICS
Volume 176, Issue 31-34, Pages 2445-2450Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2005.03.027
Keywords
fuel cell; proton conductivity; surface sulfonation; three-dimensionally ordered macroporous silica; composite membrane
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A proton-conducting porous silica matrix for composite membranes was prepared by introduction of sulfonic acid groups on the surface. The surface modification of pores in the porous silica membrane was performed by using 3-mercaptopropyltrimethoxysilane (SH oxidation method) or 1,3-propanesultone (direct reaction method). The sulfonated silica matrix exhibited high proton conductivity of 6.0 x 10(-3) S cm(-1) at 60 degrees C under 90% relative humidity. This value was about 400 times higher than that of unmodified silica matrix. The proton conductivity of the composite membrane filled by a proton-conducting gel polymer, 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), was considerably enhanced by using the sulfonated silica matrix. (c) 2005 Elsevier B.V All rights reserved.
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