Journal of Industrial and Engineering Chemistry

  • Volume 52
  • /
  • Pages.121-127
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  • 2017
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  • 1226-086X(pISSN)
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  • 1876-794X(eISSN)
The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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High-surface-area tofu based activated porous carbon for electrical double-layer capacitors

  • Lee, Do-Young (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • An, Geon-Hyoung (Program of Materials Science & Engineering, Convergence Institute of Biomedical Engineering and Biomaterials, Seoul National University of Science and Technology) ;
  • Ahn, Hyo-Jin (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • Received : 2017.02.10
  • Accepted : 2017.03.18
  • Published : 2017.08.25
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Abstract

Activated porous carbon (APC), which is used as the electrode material in electrical double layer capacitors (EDLCs), is constantly being developed to enhance its electrochemical performance with low cost. Nevertheless, APC still encounters important challenges due to the limited amount of raw material resources. Herein, we propose a novel and simple approach to synthesize APC from tofu using a simple synthesis process involving carbonization with KOH activation. To obtain the optimized APC, three types of APCs are prepared using different weight ratios of 1:3, 1:4, and 1:5 ($W_{Tofu}/W_{KOH}$) during the carbonization. The optimized APC electrode shows an outstanding specific capacitance of $207F\;g^{-1}$ at a current density of $0.1A\;g^{-1}$, a remarkable high-rate performance, an impressive energy density of $25.7-19.9W\;h\;kg^{-1}$, and an excellent cycling stability for up to 2000 cycles. Therefore, this unique approach to obtain APC using tofu yield a material with some useful qualities in terms of an increased number of electroactive sites based on a high surface area, and an improved wettability based on the oxygen-containing functional groups on the surface of the APC. Accordingly, tofu-based APC is a promising alternative to conventional APC.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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