Abstract
New composite materials consisting of phosphosilicate (P2O5-SiO2), phosphotungstic acid (PWA), 3-mercaptopropyltrimethoxysilane (MPTS) and glutaraldehyde (GL) were prepared, and a high proton conductivity of 10−2 S cm−1 was observed at room temperature. By incorporating 3-mercaptopropyltrimethoxysilane (MPTS) and glutaraldehyde (GL) in to the P2O5-SiO2-PWA inorganic matrix, the composites showed high proton conductivity in the range of 10−2–10−1 S cm−1 at 120 °C. The structural formation was confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and morphological analysis. The thermal properties were investigated by thermogravimetry (TG) and differential thermal analysis (DTA). A new inorganic–organic composite membrane was successfully prepared by a sol–gel process through hydrolysis and condensation of MPTS and tetraethoxysilane (TEOS). These P2O5-SiO2-PWA-MPTS, P2O5-SiO2-PWA-GL and P2O5-SiO2-PWA-MPTS-GL hybrid composite membranes showed high proton conductivities as a function of temperature. Moreover, they were thermally stable in air up to 250 and 300 °C due to the presence of a tolerant inorganic SiO2 framework in the matrix.
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