Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Electrochemical Characterization of Porous Graphene Film for Supercapacitor Electrode

다공성 그래핀 필름의 슈퍼캐패시터 전극용 전기화학적 특성

  • Choi, Bong Gill (Dapartment of Chemical & Biomolecular Engineering (BK21 program), KAIST) ;
  • Huh, Yun Suk (Division of Material Science, Korea Basic Science Institute) ;
  • Hong, Won Hi (Dapartment of Chemical & Biomolecular Engineering (BK21 program), KAIST)
  • 최봉길 (한국과학기술원 생명화학공학과) ;
  • 허윤석 (한국기초과학지원연구원 물성과학연구부) ;
  • 홍원희 (한국과학기술원 생명화학공학과)
  • Received : 2012.01.29
  • Accepted : 2012.05.24
  • Published : 2012.08.01
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Abstract

In this report, we fabricate the porous graphene films through embossing process and vacuum filtration method and demonstrate their superior electrochemical properties as supercapacitor electrode materials. Insertion/removal of polystyrene nanoparticles between the graphene sheets allows to provide pore structures, leading to the effective prevention of restacking in graphene films. As-prepared porous graphene films have a large surface area, a bicontinuous porous structures, high electrical conductivity, and excellent mechanical integrity. The electrochemical properties of the porous graphene films as electrode materials of supercapacitor are investigated by using aqueous $H_2SO_4$ and ionic liquid solution under three-electrode system. The porous graphene films exhibit a high specific capacitance (284.5 F/g), which is two-fold higher than that of packing graphene films (138.9 F/g). In addition, the rate capability (98.7% retention) and long-term cycling stability (97.2%) for the porous graphene films are significantly enhanced, due to the facilitated ion mobility between the graphene layers.

본 연구에서는 embossing 공정과 진공여과법에 의해서 제조된 다공성 그래핀 필름을 슈퍼캐패시터의 전극활물질로 사용하여 우수한 전기화학적 특성을 증명하였다. 그래핀 시트사이에서 Polystyrene 입자들의 삽입/제거 공정을 이용하여 기공 구조들을 제공함으로써 그래핀의 재적층(restacking)을 효과적으로 제어할 수 있었다. 상기 제조된 다공성 그래핀 필름은 넓은 표면적, 상호 연결된 기공 구조, 높은 전기전도도 및 우수한 기계적 물성을 나타내었다. 본 다공성 그래핀 필름을 슈퍼캐패시터의 전극물질로 사용하여 황산 수용액과 이온성 액체 전해질 기반의 3상 전극 시스템에서 전기화학적 특성을 살펴보았다. 다공성 그래핀 필름은 높은 비축전용량(284.5 F/g)을 나타내었으며, 이는 적층 그래핀 필름(138.9 F/g) 보다 두 배 정도 높았다. 또한, 그래핀 필름내의 이온 이동속도 향상 효과로 다공성 그래핀 필름의 충방전 속도(98.7% retention)와 충방전 수명(97.2% retention)이 크게 향상되었다.

Keywords

Acknowledgement

Supported by : 한국기초과학지원연구원

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