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Preparation of Core-Shell Structured Iron Oxide/Graphene Composites for Supercapacitors Application

코어-쉘 구조의 산화철/그래핀 복합체 제조 및 슈퍼커패시터 응용

  • Lee, Chongmin (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Chang, Hankwon (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Jang, Hee Dong (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources)
  • 이총민 (한국지질자원연구원 자원활용연구센터) ;
  • 장한권 (한국지질자원연구원 자원활용연구센터) ;
  • 장희동 (한국지질자원연구원 자원활용연구센터)
  • Received : 2018.08.03
  • Accepted : 2018.09.21
  • Published : 2018.09.30

Abstract

Core-shell structured $Fe_3O_4/graphene$ composites were synthesized by aerosol spray drying process from a colloidal mixture of graphene oxides and $Fe_3O_4$ nanoparticles. The structural and electrochemical performance of $Fe_3O_4/graphene$ were characterized by the field-emission scanning electron microscopy, X-ray diffraction, Raman spectroscopy, cyclic voltammetry, and galvanometric discharge-charge method. Core-shell structured $Fe_3O_4/GR$ composites were synthesized in different mass ratios of $Fe_3O_4$ and graphene oxide. The composite particles were around $3{\mu}m$ in size. $Fe_3O_4$ nanoparticles were encapsulated with a graphene. Morphology of the $Fe_3O_4/graphene$ composite particles changed from a spherical ball having a relatively smooth surface to a porous crumpled paper ball as the content of GO increased in the composites. The $Fe_3O_4/GR$ composite fabricated at the weight ratio of 1:4 ($Fe_3O_4:GO$) exhibited higher specific capacitance($203F\;g^{-1}$) and electrical conductivity than as-fabricated $Fe_3O_4/GR$ composite.

Acknowledgement

Supported by : 한국지질자원연구원

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