Journal
DIAMOND AND RELATED MATERIALS
Volume 10, Issue 3-7, Pages 620-626Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-9635(00)00381-2
Keywords
electrochemistry; nano-honeycomb diamond; non-aqueous electrolyte; electrical double-layer capacitor
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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 TEABF(4)/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 muF 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. (C) 2001 Elsevier Science B.V. All rights reserved.
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