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Proton-conducting membranes based on HTFSI-doped PEI/SiO2 nanocomposites

✍ Scribed by Zhiwei Yang; Decio H. Coutinho; Duck-Joo Yang; Kenneth J. Balkus Jr.; John P. Ferraris

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
380 KB
Volume
313
Category
Article
ISSN
0376-7388

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✦ Synopsis

Novel proton-conducting membranes comprising polymer/inorganic materials based on linear polyethyleneimine (LPEI)/SiO 2 nanocomposites synthesized through sol-gel processing have been prepared. 3-Glycidyloxypropyl-trimethoxysilane (GLYMO) has been used to cross-link the LPEI to afford improved heat resistance. The addition of trifluoromethanesulfonimide (HTFSI) during membrane processing doped the amine groups of LPEI to form immobilized Brønsted acid-base pairs, which provide the hybrid membrane's proton conductivity. The resulting membranes show a proton conductivity as high as 1 × 10 -2 S/cm at 90 • C, 100% relative humidity and 5.6 × 10 -5 S/cm at high temperatures (≥130 • C) under anhydrous conditions. The effects of temperature, humidity and mobility of active groups on the conductivity are discussed.

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