Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Electrochemical Properties of Porous Co(OH)2 Nano-flake Thin Film Prepared by Electro-deposition for Supercapacitor

전착법을 이용한 슈퍼커패시터용 다공성 Co(OH)2 나노플레이크 박막의 제조 및 전기화학적 특성

  • Lee, Hyeon Jeong (Department of Chemical Engineering, Chungbuk National University) ;
  • Jin, En Mei (Department of Chemical Engineering, Chungbuk National University) ;
  • Jeong, Sang Mun (Department of Chemical Engineering, Chungbuk National University)
  • 이현정 (충북대학교 화학공학과) ;
  • 김은미 (충북대학교 화학공학과) ;
  • 정상문 (충북대학교 화학공학과)
  • Received : 2015.08.21
  • Accepted : 2015.11.03
  • Published : 2016.04.01
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Abstract

Porous $Co(OH)_2$ nano-flake thin films were prepared by a potential-controlled electro-deposition technique at various deposition voltage (-0.75, -1.0, -1.2, and -1.4 V) on Ti-mesh substrates for supercapacitor application. The potential of electrode was controlled to regulate the film thickness and the amount of $Co(OH)_2$ nano-flake on the titanium substrate. The film thickness was shown to reach the maximum value of $34{\mu}m$ at -1.4 V of electrode potential, where 17.2 g of $Co(OH)_2$ was deposited on the substrate. The specific discharge capacitances were measured to be 226, 370, 720, and $1008mF\;cm^{-2}$ in the 1st cycle corresponding to the films which were formed at -0.75, -1.0, -1.2, and -1.4 V of electrode potentials, respectively. Then the discharge capacities were decreased to be 206, 349, 586 and $866mF/cm^{-2}$, where the persistency rates were 91, 94, 81, and 86%, respectively.

다공성 $Co(OH)_2$ 나노플레이크 박막은 전위제어 전착법을 이용하여 티타늄 메쉬에 여러 전착전위(-0.75, -1.0, -1.2 및 -1.4 V)에서 전착하여 슈퍼커패시터에 이용하였다. 티타늄 메쉬에 전착된 $Co(OH)_2$ 나노플레이크 박막의 두께 및 전착량은 전착전위의 제어에 의해 결정되었고 -1.4 V에서 전착한 $Co(OH)_2$ 나노플레이크 박막의 두께는 약 $34{\mu}m$로 가장 두껍게 전착되었으며 전착량은 17.2 g이다. 전착전위 -0.75, -1.0, -1.2 및 -1.4 V에서 전착한 경우 초기 방전용량은 각각 226, 370, 720 그리고 $1,008mF\;cm^{-2}$으로 나타났고 1,000 사이클 후 각각 206, 349, 586 그리고 $866mF\;cm^{-2}$으로 나타났다. 또한 이들의 용량유지율은 각각 91, 94, 81 및 86%로 나타났다.

Keywords

References

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