Synthesis and Characterization of Modified Silicas and Carbons for Use as Electrodes in Electrochemical Supercapacitors – Second Annual Report

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Authors
  1. Pickup, P.G.
  2. Kalinathan, K.
  3. Liu, X.
  4. DesRoches, D.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Memorial Univ of Newfoundland, St John's Nfld (CAN) Dept of Chemistry
Abstract
By using 0.00100 Nafion (NRE-211) and 0.00300 carbon paper, the equivalent series resistance of our ruthenium oxide supercapacitors has been decreased to 0.10 Ohm. This has increased the maximum power over full discharge to > 50 W/kg. We have also determined the usable voltage range and found that the device can be efficiently charged to 1.4 V. This increases the power and energy density further. The low temperature performance of the supercapacitors appears to be significantly better than literature results. Work on improving the specific capacitance of ruthenium oxide has focussed on variation of the annealing temperature and preparing composites with Spectrcarb 2225 carbon fabric. Ruthenium oxide samples annealed at temperatures below the optimum of 110ºC exhibit a broad peak in their current-voltage response that is characteristic of redox behaviour. This offers the potential for enhanced specific capacitances, energy densities, and power densities, although these have not yet been realized. However, the specific capacitance of the ruthenium oxide annealed at 110ºC has been increased to > 1000 F/g by dispersion on carbon fabric. Further work will be focused on similar composites with ruthenium oxide annealed at lower temperatures. Manganese oxide dispersed on carbon fabric has also yielded potentially useful capacitive behaviour, although there is a rapid initial loss of capacitance. It is not yet clear how large the sustainable specific capacitance will be. Black Pearl

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Report Number
DRDC-ATLANTIC-CR-2008-090 — Contractor Report
Date of publication
01 Jul 2008
Number of Pages
50
DSTKIM No
CA032184
CANDIS No
531275
Format(s):
CD ROM

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