ChemInform Abstract: High Proton Conductivity in Porous P₂O₅—SiO₂ Glasses.

Abstract

High Proton Conductivity in Porous P 2 O 5 -SiO 2 Glasses.-Porous silica glasses containing 2 or 5 mol% P 2 O 5 are prepared by a sol-gel process starting with the hydrolysis of Si(OEt) 4 and PO(OMe) 3 . The electrical conductivity of the glasses is studied as a function of the pore structure and the amount of adsorbed water. The pore structure is controlled by addition of formamide during gel syntheses and the specific surface area is varied over the range 200-900 m 2 /g. Exposure to humid atmosphere results in water absorption. The conductivity is found to increase linearly with increasing product of the surface area and the reciprocal number of the pore radius. The protons in P-OH bonds give conductivities 4 orders of magnitude higher than that of Si-OH bonds. The highest conductivity of 2·10 −2 S/cm is observed for the glass with 5 mol% P 2 O 5 after heating at 700 • C and water absorption. -(NOGAMI, MASAYUKI; NAGAO, RITSUKO; WONG, CONG; KASUGA, TOSHIHIRO; HAYAKAWA, TOMOKATSU;

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