Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Morphology Effect on Electrocatalytic Activity of TiO2 Spheres Synthesized by Binary Ionic Liquids in Water Electrolysis

  • Hong, Ki-Won (Department of Chemical Engineering, Seoul National University of Science & Technology) ;
  • Pak, Dae-Won (Graduate School of Energy and Environment, Seoul National University of Science & Technology) ;
  • Yoo, Kye-Sang (Department of Chemical Engineering, Seoul National University of Science & Technology)
  • Received : 2011.12.09
  • Accepted : 2012.01.18
  • Published : 2012.06.20
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Abstract

Titania spheres were synthesized using binary ionic liquids to examine the electrocatalytic activity in acid solution. The morphology of $TiO_2$ particles was significantly different with the composition of ionic liquids. Among the binary ionic liquids, four set of mixtures led to the formation of $TiO_2$ sphere with various sizes. The morphology and structure of $TiO_2$ particles were characterized by XRD, $N_2$ physisoption and SEM analysis. All samples possessed an anatase phase after calcinations at $500^{\circ}C$. The structural properties of the samples were varied significantly with the morphology. In cyclic voltammograms, the morphology of $TiO_2$ spheres affected the electrocatalytic activity in water electrolysis. Among the samples, [Omim][$BF_4$]+[Hmim][$BF_4$] was the most effective ionic liquid to synthesize $TiO_2$ sphere with optimum morphology showing the highest electocatalytic performance.

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References

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