Journal
SOLID STATE IONICS
Volume 179, Issue 21-26, Pages 1151-1154Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2008.02.021
Keywords
3-aminopropyltriethoxysilane; phosphoric acid; proton conduction; inorganic-organic hybrid; intermediate temperature
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Proton conductive inorganic-organic hybrid membranes with acid-base pairs have been prepared from 3-aminopropyltriethoxysilane and phosphoric acid by the sol-gel method. The self-standing membranes obtained are represented as poly(3-aminopropylsilsesquioxane)-H(3)PO(4) (PAPS-H(3)PO(4)) membranes. Infrared absorption spectra of the PAPS-H(3)PO(4) films showed that amino groups of PAPS were protonated by phosphoric acid, indicating the formation of acid-base pairs. X-ray diffraction patterns of the PAPS-H(3)PO(4) membranes showed diffraction peaks attributed to hexagonal structure, which is probably formed by stacking of rodlike polysiloxane with the acid-base pairs extruded outside. The conductivities of the PAPS-H(3)PO(4) membranes with a molar ratio Of H(3)PO(4)/APTES = 1.0 was 4 x 10(-4) S cm(-1) at 150 degrees C under dry condition. (c) 2008 Elsevier B.V. All rights reserved.
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