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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 2
BKCSDE 26(2)
February 20, 2005 

Preparation and Characterization of Proton Conductive Phosphosilicate Membranes Based on Inorganic-Organic Hybrid Materials
Sheng-Jian Huang, Hoi-Kwan Lee, Won-Ho Kang*
Proton conductivity, Phosphosilicate, Sol-gel process, Inorganic-organic hybrid, Fuel cells
A series of proton conductive inorganic-organic hybrid membranes doped with phosphoric acid (H3PO4 ) and/ or triethylphosphate (PO(OEt)3) have been prepared by sol-gel process with 3-glycidoxypropyltrimethoxysilane (GPTMS), 3-aminopropyltriethoxysilane (APTES) and tetraethoxysilane (TEOS) as precursors. High proton conductivity of 3.0 × 10?3 S/cm with composition of 50TEOS-30GPTMS-20APTES-50H3PO4 was obtained at 120 ºC under 50% relative humidity. Thermal stability of membrane was significantly enhanced by the presence of SiO2 framework up to 250 ºC. XRD revealed that the gels are amorphous. IR spectra showed a good complexation of H3PO4 in the matrix. The conductivity under 75% relative humidity was significantly improved by addition of APTES due to the increase in concentration of defected site in hybrid matrix. The effect of PO(OEt)3, humidifying time, and heat-treatment were also investigated. PO(OEt)3 had no improvement on conductivity and conductivity increased with humidifying time, however, decreased with heating temperature.
241 - 247
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