Electrochemical characterization of nanoporous honeycomb diamond electrodes in non-aqueous electrolytes

M. Yoshimura, K. Honda, R. Uchikado, T. Kondo, Tata N. Rao, D. A. Tryk, A. Fujishima, Y. Sakamoto, K. Yasui, H. Masuda

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36 Citations (Scopus)

Abstract

Oxygen plasma-etched nano-honeycomb diamond thin film electrodes were examined for electrochemical capacitor applications in non-aqueous electrolytes. As-deposited and nano-honeycomb diamond electrodes in 0.5 M TEABF4/PC both exhibited a wide potential window (approx. 7.3 V), similar to that of glassy carbon electrodes. For as-deposited diamond, the impedance behavior was found to be similar for non-aqueous and aqueous electrolytes, and the double-layer capacitance was found to be 21.8 μF cm-2, almost the same as that obtained in aqueous electrolytes. For the honeycomb diamond electrodes, however, the impedance behavior observed in non-aqueous electrolytes was significantly different from that in aqueous electrolyte and indicated that the ac signal cannot penetrate to the bottom of the honeycomb pores in the non-aqueous electrolytes due to low conductivity, and that not all the surface may contribute to the double-layer capacitance. This result was verified by mathematical simulation.

Original languageEnglish
Pages (from-to)620-626
Number of pages7
JournalDiamond and Related Materials
Volume10
Issue number3-7
DOIs
Publication statusPublished - 2001 Mar 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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