Current Applied Physics

Korean Physical Society (한국물리학회)
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Ultrahigh supercapacitance in cobalt oxide nanorod film grown by oblique angle deposition technique

  • Kannan, V. (Millimeter-wave INnovation Technology Research Center (MINT), Dongguk University-Seoul) ;
  • Choi, Jong-Hyeok (Division of Electronics and Electrical Engineering, Dongguk University-Seoul) ;
  • Park, Hyun-Chang (Division of Electronics and Electrical Engineering, Dongguk University-Seoul) ;
  • Kim, Hyun-Seok (Division of Electronics and Electrical Engineering, Dongguk University-Seoul)
  • Received : 2018.05.26
  • Accepted : 2018.08.08
  • Published : 2018.11.30
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Abstract

Nanorod films of cobalt oxide ($Co_3O_4$) have been grown by a unique oblique angle deposition (OAD) technique in an e-beam evaporator for supercapacitor electrode applications. This technique offers a non-chemical route to achieve large aspect ratio nanorods. The fabricated electrodes at OAD $80^{\circ}$ exhibited a specific capacitance of 2875 F/g. The electrochemically active surface area was $1397cm^{-2}$, estimated from the non-Faradaic capacitive current region. Peak energy and power densities obtained for $Co_3O_4$ nanorods were 57.7 Wh/Kg and 9.5 kW/kg, respectively. The $Co_3O_4$ nanorod electrode showed a good endurance of 2000 charge-discharge cycles with 62% retention. The OAD approach for fabricating supercapacitor nanostructured electrodes can be exploited for the fabrication of a broad range of metal oxide materials.

Keywords

Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP), National Research Foundation of Korea (NRF)

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