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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 6
BKCSDE 33(6)
June 20, 2012 

Morphology Effect on Electrocatalytic Activity of TiO2 Spheres Synthesized by Binary Ionic Liquids in Water Electrolysis
Kiwon Hong, Daewon Pak, Kye Sang Yoo*
TiO2 sphere, Ionic liquid, Electrocatalyst
Titania spheres were synthesized using binary ionic liquids to examine the electrocatalytic activity in acid solution. The morphology of TiO2 particles was significantly different with the composition of ionic liquids. Among the binary ionic liquids, four set of mixtures led to the formation of TiO2 sphere with various sizes. The morphology and structure of TiO2 particles were characterized by XRD, N2 physisoption and SEM analysis. All samples possessed an anatase phase after calcinations at 500 oC. The structural properties of the samples were varied significantly with the morphology. In cyclic voltammograms, the morphology of TiO2 spheres affected the electrocatalytic activity in water electrolysis. Among the samples, [Omim][BF4]+[Hmim][BF4] was the most effective ionic liquid to synthesize TiO2 sphere with optimum morphology showing the highest electocatalytic performance.
1829 - 1833
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