Preparation and conductivity of solid high-proton conductor silica gels containing 12-tungstogermanic heteropoly acid

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 68; no. 3; pp. 161 - 165
• Main Authors: Wu, Qingyin, Tao, Shanwen, Lin, Haohao, Meng, Guangyao
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 03.01.2000; Elsevier
• Subjects: Chemistry; Colloidal gels. Colloidal sols; Colloidal state and disperse state; Electrical conductivity; Exact sciences and technology; General and physical chemistry; Infrared spectroscopy; Sol-gel growth; X-ray diffraction; X-ray diffraction; Infrared spectroscopy; Electrical conductivity; Sol-gel growth; Infrared spectrometry; Heteropolyacid; Electrical properties; Sol gel process; Preparation; Proton conductivity; Silica gel; X ray diffraction; Modified material
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/S0921-5107(99)00584-X

Silica gels containing 12-tungstogermanic acid were prepared by means of sol-gel method. Infrared spectra and XRD patterns revealed that the Keggin structure characteristic of GeW 12O 40 4− anion was present in the silica gel skeleton. The regularity of the change of the characteristic peaks in the infrared spectra was investigated. The silica gels exhibited considerably high-proton conductivity, and the conductivity increased with increasing 12-tungstogermanic acid content. The proton conductivity of gel containing 71 wt% 12-tungstogermanic acid is 4.00×10 −3 s cm −1 at room temperature (16°C).