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Conversion Of Pencil Graphite To Graphene/polypyrrole Nanofiber Composite Electrodes And Its Doping Effect On The Supercapacitive Properties
Project Description :

Graphene platelets were synthesized from pencil flake graphite and commercial graphite by chemical method. the chemical method involved modified hummer’s method to synthesize graphene oxide (go) and the use of hydrazine monohydrate to reduce go to reduced graphene oxide (rgo). rgo was further reduced using rapid microwave treatment in presence of little amount of hydrazine monohydrate to graphene platelets. chemically modified graphene/polypyrrole (ppy) nanofiber composites were prepared by insitu anodic electropolymerization of pyrrole monomer in the presence of graphene on stainless steel substrate. the morphology, composition and electronic structure of the composites together with ppy fibers, graphene oxide (go), rgo and graphene were characterized using x-ray diffraction (xrd), laser-raman and scanning electron microscopic (sem) methods. from sem, it was observed that chemically modified graphene formed as a uniform nanocomposite with the ppy fibers absorbed on the graphene surface and/or filled between the graphene sheets. such uniform structure together with the observed high conductivities afforded high specific capacitance and good cycling stability during the charge-discharge process when used as supercapacitor electrodes. a specific capacitance of as high as 304 fg-1 at a current density of 2 ma cm-1 was achieved over a ppy-doped graphene composite.

 
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Project Details :
  • Date : Dec 26,2014
  • Innovator : Dr.Selvakumar
  • Team Members : Vindyashree, Vidya Smitha, Prashanthi
  • Guide Name : Dr. M. Selvakumar
  • College : Manipal Institute of Technology
  • University : Manipal university
  • Submission Year : 2015
  • Category : Materials Science
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