Double layer capacitance of high surface area carbon nanospheres derived from resorcinol–formaldehyde polymers
✍ Scribed by Daisuke Tashima; Eri Yamamoto; Nanami Kai; Daisuke Fujikawa; Go Sakai; Masahisa Otsubo; Tsuyoshi Kijima
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 842 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
Micro-mesoporous bimodal carbon nanospheres with high surface areas were synthesized by a combined use of surfactant templating technique and BaO 2 chemical activation one.
Starting spherical nanopolymer/surfactant composites were prepared by the NaOH-catalyzed reaction of resorcinol (R) and formaldehyde (F) in the presence of cetyltrimethylammonium bromide (CTAB) as a core template and 1,3,5-trimethylbenzene (TMB) and tertbutanol (t-BuOH) as cosurfactants. After pretreatment with hydrochloric acid, the composite materials were calcined at 1000 °C in N 2 coexistent with varying weight ratios of BaO 2 to RF polymer ranging from 0 to 11. It produced micro-mesoporous bimodal carbon nanospheres of 124-143 nm diameter, with specific surface areas as high as 1884 m 2 g À1 or up to 3301 m 2 g À1 , in contrast to microporous ones with smaller surface areas obtained at low BaO 2 -loadings. The electrochemical double layer capacitance of the resulting nanocarbons in 0.5 M H 2 SO 4 showed a marked increase with specific surface areas, up to as high as 219 F g À1 for the highest surface area carbon material.