Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Naphthalene Derivative Supported Activated Carbon Composite Electrode with Enhanced Capacitance and Potential Window

  • Hu, Mengyang (Department of Applied Chemistry & Biotechnology, Hanbat National University) ;
  • Park, Jeong Ho (Department of Applied Chemistry & Biotechnology, Hanbat National University) ;
  • Lee, Kwang Se (Department of Applied Chemistry & Biotechnology, Hanbat National University) ;
  • Ko, Jang Myoun (Department of Applied Chemistry & Biotechnology, Hanbat National University)
  • Received : 2018.06.08
  • Accepted : 2018.10.01
  • Published : 2019.06.30
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Abstract

A derivative of 1,4-Naphthoquinone coded HBU671 was synthesized and used in addition to activated carbon as composite electrode for supercapacitor application. From the electrochemical properties analysis, a specific capacitance of about $300F\;g^{-1}$ exhibited almost two times of that of activated carbon at a scan rate of $100mV\;s^{-1}$ and a potential window of - 0.2 - 1V. This improvement is due to the inherent redox reaction in HBU671. Cycle test also proved that this composite is still stable even after 1000 cycle within the applied potential window and it is highly recommended for practical application.

Keywords

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Fig. 2. Fourier-transform infrared spectra of the composite electrode, HBU671, and the activated carbon.

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Fig. 3. Scanning electron microscopic surface images of the activated carbon (a,b) and composite electrode (c,d) at low and high magnification.

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Fig. 4. Cyclic voltammograms of composite electrodes (a) compared with activated carbon at 100 mV s-1 and (b) at different scan rates.

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Fig. 5. Specific capacitances of the activated carbon and the composite electrodes as a function of scan rate and cycle number at 500 mV/s.

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Fig. 6. Nyquist plots of activated carbon, HBU671, and the composite electrodes.

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Fig. 7. Charge-discharge graphs of activated carbon and the composite electrodes, measured at 5.0 mA cm-2.

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Fig. 1. (a) Synthesis of HBU671, (b) Mechanism of HBU671 redox reaction in electrode, and (c) Mechanism of redox reaction of quinone.

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