Structures and electrical properties of core–shell composite electrolytes with multi-heterointerfaces

Thermally and chemically stable phenylsilsesquioxane (PhSiO 3/2) particles were prepared by sol–gel process, and ultra-thin layers of oppositely charged poly(diallyldimethylammonium chloride) (PDDA) and dodecatungstophosphoric acid (WPA) were alternately deposited on the negative-charged PhSiO 3/2 p...

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Bibliographic Details
Published in:Solid state ionics 2007-04, Vol.178 (7), p.621-625
Main Authors: Daiko, Yusuke, Katagiri, Kiyofumi, Shimoike, Kazunori, Sakai, Mototsugu, Matsuda, Atsunori
Format: Article
Language:English
Subjects:
Fuel cell
Layer-by-layer assembly
Phenylsilsesquioxane
Proton conductivity
Sol–gel
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Summary:Thermally and chemically stable phenylsilsesquioxane (PhSiO 3/2) particles were prepared by sol–gel process, and ultra-thin layers of oppositely charged poly(diallyldimethylammonium chloride) (PDDA) and dodecatungstophosphoric acid (WPA) were alternately deposited on the negative-charged PhSiO 3/2 particles via layer-by-layer assembly technique. Hygroscopic property of WPA was remarkably reduced owing to the formation of PDDA/WPA complex. The amount of WPA adsorbed on PhSiO 3/2 particles was estimated to be ∼ 0.03 (g/g PhSiO 3/2). Transparent and monolithic pellet can be obtained from the resultant core–shell particles by pressing. Proton conductivity of WPA-deposited samples increased about 4 orders of magnitude compared with unmodified samples, and reached to about 10 − 4  S/cm at 80 °C and 80% relative humidity.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2007.02.001