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Study on Proton Exchange Membrane of SiO2/Silicotungstic Acid Modified PVA by In-situ Synthesis

Authors： LIU Shuti 1,2，GUO Guibao *2，BAN Hui 1,2，ZHAO Wenguang2

Units： 1. School of Chemistry and Chemistry Engineering, Inner Mongolia University of Science & Technology, Baotou 014010;2.School of Materials and Metallurgy,Inner Mongolia University of Science & Technology,Baotou 014010)

KeyWords： proton exchange membrane; poly(vinyl alcohol);in-situ synthesis; SiO2

ClassificationCode：TM911.48

year,volume(issue):pagination： 2015,35(1):82-86

Abstract：

Polyvinyl alcohol (PVA) as a matrix, silica and silicon tungstate (SiWA) particles prepared by in-situ synthesis uniformly distributed in the SiO2/SiWA-m-PVA membrane. With scanning electron microscopy (SEM) and thermal gravimetric analysis(TG),the morphology and thermal stability of the membrane are characterized. The influence of mole ratio of SiCl4/sodium tungstate on conductivity and methanol permeability is studied by AC impedance spectroscopy and gas chromatography. The results show that the in-situ synthesized silica and silicon tungstate dispersed well in membrane when the molar ratio of silicon tetrachloride to sodium tungstate is 1:1.SiO2/SiWA-m-PVA membrane has good water retention below 100℃. At room temperature, the proton conductivity of 1.48× 10−2S·cm−1,methanol permeability of 1.37×10−7cm2·s-1 lower an order of magnitude than Nafion117 membrane under the same conditions, power density for direct methanol fuel cell is up to 11.82 mW?cm-2.

Funds：

内蒙古自治区高等学校科学研究项目（NJZZ13129）,

AuthorIntro：

刘书题，男，硕士研究生， e-mail: liushuti2008@163.com

Reference：

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