Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of Hydrogen in Rapid Thermal Annealing on the Graphene-Zinc Oxide Electrode for Supercapacitor

슈퍼커패시터용 그래핀-산화아연 전극의 급속열처리에서 수소의 영향

  • Jeong, Woo-Jun (School of Energy, Materials & Chemical Engineering Korea University of Technology and Education) ;
  • Oh, Ye-Chan (School of Energy, Materials & Chemical Engineering Korea University of Technology and Education) ;
  • Kim, Sang-Ho (School of Energy, Materials & Chemical Engineering Korea University of Technology and Education)
  • 정우준 (한국기술교육대학교 에너지신소재화학공학과) ;
  • 오예찬 (한국기술교육대학교 에너지신소재화학공학과) ;
  • 김상호 (한국기술교육대학교 에너지신소재화학공학과)
  • Received : 2019.05.07
  • Accepted : 2019.06.12
  • Published : 2019.06.30
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Abstract

With recent demand for the renewable energy resources, we conducted a research on the energy conversion and storage device of supercapacitor. The hybrid graphene-zinc oxide(GZO) electrodes for the supercapacitors (SCs) were fabricated and investigated. To increase the electrical conductivity of the GZO electrode, the rapid thermal annealing(RTA) in $Ar/H_2$(10%) atmosphere was applied and the effect was examined by comparing it with RTA at Ar atmosphere. In Raman spectroscopy, the electrodes annealed at 400? in $Ar/H_2$ atmosphere showed a lower ratio of D/G peak than that of annealed at Ar atmosphere, and had a larger specific capacitance(Sc) in the cyclic voltammetry(CV), and a lower the equivalent series resistance(ESR) in the electrochemical impedance spectroscopy(EIS). The reason seems to come from the better mixing of the graphene and zinc oxide by the RTA in $Ar/H_2$(10%).

Keywords

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Fig. 1. XRD patterns of a) GO, chemically reduced RGO, thermally annealed RGO, graphene-zinc oxide(Doping Zn) and b) RGO annealed at the various RTA conditions.

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Fig. 2. XRD patterns of a) RGO annealed at the various RTA conditions measuring at the 2θ of 40°~50° and b) at the 2θ of 44°~46°.

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Fig. 3. a) Raman spectrographs of RGO and RTA RGO at 400℃ and 800℃ in Ar and Ar/H2 atmosphere and b) the D/G ratio depending on the RTA conditions.

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Fig. 5. Cyclic voltammetry analyses of GZO depending on RTA temperature and atmosphere.

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Fig. 6. Specific capacitance(Sc) of GZO depending on RTA temperature and atmosphere

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Fig. 7. Electrochemical impedance of RGO rapid thermal annealed at 400℃ and 800℃ in Ar and Ar/H2

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Fig. 4. XPS patterns of a) RGO annealed at the various RTA conditions. b) C1s XPS peaks of RGO annealed at the various RTA conditions

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