Preparation, characterization and proton-conductivity of silica gel containing 71 wt.% 12-tungstogermanic heteropoly acid

• Published in: Materials chemistry and physics Vol. 64; no. 1; pp. 25 - 28
• Main Authors: Wu, Qingyin, Tao, Shanwen, Lin, Haohao, Meng, Guangyao
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 31.03.2000; Elsevier
• Subjects: Chemical synthesis; combustion synthesis; Composite materials; Cross-disciplinary physics: materials science; rheology; Differential thermal analysis (DTA); Electrical conductivity; Exact sciences and technology; Fourier transform infrared spectroscopy (FTIR); Materials science; Materials synthesis; materials processing; Physics; Sol–gel growth; Composite materials; Fourier transform infrared spectroscopy (FTIR); Electrical conductivity; Sol–gel growth; Differential thermal analysis (DTA); DTA; Infrared spectroscopy; Tungsten complexes; Silica gel; XRD; Experimental study; Sol-gel process; Crystal structure; TGA
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/S0254-0584(99)00244-8

Silica gel containing 71 wt.% 12-tungstogermanic acid was prepared by means of sol–gel method. Infrared (IR) spectrum and X-ray powder diffraction (XRD) pattern revealed that the Keggin structure characteristic of GeW 12O 40 4− anion was present in the silica gel skeleton. The change of the characteristic peaks in the IR spectra was investigated. Thermogravimetry (TG) curve shows that there are three steps of weight loss. Differential thermal analysis (DTA) curve shows that the thermal stability of gel is lower than that of pure 12-tungstogermanic acid. The silica gel exhibited considerably high proton conductivity. It is 4.00 × 10 −3 S cm −1 at room temperature (16°C).