Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Fabrication and characterization of a Flexible Polyethylene terephthalate (PET) Electrode based on Single-walled carbon nanotubes (SWNTs)

단일벽 탄소나노튜브를 이용한 플렉시블 폴리에틸렌테레프탈레이트 (PET) 전극의 제조와 특성

  • Du, Jin Feng (Department of chemical engineering, Daejin University) ;
  • Kim, Jang Hun (Department of chemical engineering, Daejin University) ;
  • Kim, Yong Ryeol (Department of chemical engineering, Daejin University) ;
  • Jeong, Hyeon Taek (Department of chemical engineering, Daejin University)
  • 두진펑 (대진대학교 화학공학과) ;
  • 김장훈 (대진대학교 화학공학과) ;
  • 김용렬 (대진대학교 화학공학과) ;
  • 정현택 (대진대학교 화학공학과)
  • Received : 2016.07.27
  • Accepted : 2016.09.29
  • Published : 2016.09.30
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Abstract

In this study, flexible acid treated single walled carbon nanotubes (A-SWCNTs) electrodes were fabricated by using gold coated PET substrate and spray coating technique. The acid-treatment method was conducted to introduce functional groups on the SWCNTs wall, which could improve dispersability of the SWCNTs and its electrochemical property. The electrochemical properties of flexible A-SWCNTs electrode were carried out by cyclic voltammetry(CV), electrochemical impedance were carried out by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and galvanostatic charge/discharge (GCD) cycles. As a results, The specific capacitance value of the unbent A-SWCNTs electrode was $67F{\cdot}g^{-1}$, which decreased to $63F{\cdot}g^{-1}$ (94% retention) after 1000 GCD cycles. Interestingly, the specific capacitance of the unbent A-SWCNTs electrode with application of the 1000 GCD cycles was retained even after 500 bending to $30^{\circ}$ with 6000 GCD cycles.

본 연구에서는 유연성을 갖는 전극 제조를 위해 산 처리된 단일벽 탄소나노튜브 (Acid treated-SWCNTs)를 금이 코팅된 PET 기판 위에 스프레이 코팅하였다. 단일벽 탄소나노튜브가 가지는 단점을 보완하기 위하여 산 처리 공정을 이용하여 나노튜브에 작용기를 도입하여 분산성을 극대화 시켰으며 전기화학적 특성을 향상 시켰다. 스프레이 기술을 이용하여 제조된 유연성을 갖는 단일벽 탄소나노튜브 기반의 전극을 1 M의 황산 전해질에서 순환 전압 전류법, 임피던스 분광법 그리고 충 방전 시험을 통하여 전기화학적 특성을 분석 하였다. 그 결과, 응력을 가하지 않은 전극의 전기 용량값은 $67F{\cdot}g^{-1}$로 측정 되었으며, 1000번의 충 방전 시험 후에는 전기 용량값이 $63F{\cdot}g^{-1}$ (94 % 유지)로 감소하는 결과를 보였다. 이에 반하여, 탄소나노튜브 기반의 플렉시블 전극은 500번의 굽힘 시험 (bending test)과 6000번의 충 방전 시험 후에는 초기의 전기 용량값 ($67F{\cdot}g^{-1}$)이 유지되는 결과를 얻었다.

Keywords

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