Correlation of double-layer capacitance with the pore structure of sol-gel derived carbon xerogels
Nine different sol-gel derived carbon xerogels were prepared with different pore structures by varying the carbonization temperature (in flowing N{sub 2}) and activation time (in 5% CO{sub 2} in N{sub 2}). For each of these carbon xerogels, mesopore and micropore size distributions and cumulative surface areas were extracted from a density functional theory analysis. Increasing the carbonization temperature caused a decrease in the number of micropores in the 6 {angstrom} range but had little effect on the mesopore size distribution and thus mesopore cumulative surface area. Increasing the CO{sub 2} activation time caused an increase in the number of both micro- and mesopores where pores in the 6 {angstrom} width range eventually became pores in the 12 {angstrom} width range. The electrochemical double-layer capacitance (DLC) of the carbon xerogels was found to correlate well with changes in the pore structure, and it was determined that pores less than about 8 {angstrom} in width did not contribute to the DLC.
- Research Organization:
- Univ. of South Carolina, Columbia, SC (US)
- Sponsoring Organization:
- US Department of the Army; US Department of Energy
- DOE Contract Number:
- FC02-91ER75666
- OSTI ID:
- 20001075
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 10 Vol. 146; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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