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Preparation and capacitance behaviors of cobalt oxide/graphene composites
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  • Journal title : Carbon letters
  • Volume 13, Issue 2,  2012, pp.130-132
  • Publisher : Korean Carbon Society
  • DOI : 10.5714/CL.2012.13.2.130
 Title & Authors
Preparation and capacitance behaviors of cobalt oxide/graphene composites
Park, Suk-Eun; Park, Soo-Jin; Kim, Seok;
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 Abstract
In this study, cobalt oxide ()/graphene composites were synthesized through a simple chemical method at various calcination temperatures. We controlled the crystallinity, particle size and morphology of cobalt oxide on graphene materials by changing the annealing temperatures (200, 300, ). The nanostructured /graphene hybrid materials were studied to measure the electrochemical performance through cyclic voltammetry. The /graphene sample obtained at showed the highest capacitance of 396 at 5 . The morphological structures of composites were also examined by scanning electron microscopy and transmission electron microscopy (TEM). Annealing /graphene samples in air at different temperatures significantly changed the morphology of the composites. The flower-like cobalt oxides with higher crystallinity and larger particle size were generated on graphene according to the increase of calcination temperature. A TEM analysis of the composites at revealed that nanoscale (~7 nm) particles were deposited on the surface of the graphene. The improved electrochemical performance was attributed to a combination effect of graphene and pseudocapacitive effect of .
 Keywords
cobalt oxide graphene composites;calcination temperatures;electrochemical performance;pseudocapacitive effect;
 Language
English
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