TiO2 coated Si nanowire electrodes for electrochemical double layer capacitors in room temperature ionic liquid

F. Konstantinou, A. Shougee, T. Albrecht, K. Fobelets

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Abstract

Three TiO2 deposition processes are used to coat the surface of Si nanowire array electrodes for electrochemical double layer capacitors in room temperature ionic liquid [Bmim][NTF2]. The fabrication processes are based on wet chemistry only and temperature treatments are kept below 450 °C. Successful TiO2 coatings are found to be those that are carried out at low pressure and with low TiO2 coverage to avoid nanowires breakage. The best TiO2 coated Si nanowire array electrode in [Bmim][NTF2] showed energy densities of 0.9 Wh•kg−1 and power densities of 2.2 kW•kg−1 with a nanowire length of ~10 µm.
Original languageEnglish
Article number415503
Number of pages6
JournalJournal of Physics D: Applied Physics
Volume50
Issue number41
DOIs
Publication statusPublished - 21 Sep 2017

Keywords

  • silicon nanowires
  • TiO2
  • nanoparticles
  • ionic liquid
  • supercapacitor electrode

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