Kurniawan, Alfin, Effendi, Chintya, Ong, L.K., Kurniawan, Fredi, Lin, C.X., Angkawijaya, Artik Elisa, Yi-Hsu, Lu, Ismadji, Suryadi and Zhao, X.S. (2013) Preparation of nanoporous carbon microspheres by subcritical water carbonization and electrocapacitive study. Electrochimica Acta, 111. pp. 99-107. ISSN 0013-4686
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Abstract
In this work, sugar-derived Carbon microspheres (CMSs) with diameters in the range of 5–10 m and uniform nanopores were prepared using the subcritical water carbonization method, followed by microwave-assisted KOH activation. The carbonization was conducted at 3 MPa and moderate temperatures (150–170◦C) in subcritical water, which is a green dehydrating agent. The formation of the CMSs from a sugar solution under subcritical water conditions followed a radical-catalysed emulsion polymerization mechanism. The specific surface area and pore volume of the CMSs were found to increase with increasing the mass ratio of KOH over carbon up to 1:1. Electrocapacitive results showed that a sample prepared at a KOH to carbon ratio of 1:1 and microwave irradiation level of 70% possessed the highest specific capacitance (about 179.2F/g) at a current density of 1A/g and excellent cycling performance over 1000 charging/discharging cycles without significantly loss in capacitance. The specific capacitance and capacitive retention of this electrode are comparable to that of an electrode prepared from commercial YP-80F activated carbon
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Sugar, nanoporous carbon microspheres, subcritical water carbonization, microwave activation, capacitance |
| Subjects: | Engineering > Chemical Engineering |
| Divisions: | Journal Publication |
| Depositing User: | Suryadi. Ismadji |
| Date Deposited: | 13 Jul 2016 07:59 |
| Last Modified: | 19 Jul 2018 07:43 |
| URI: | http://repository.ukwms.ac.id/id/eprint/5179 |
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