Preparation of nanoporous carbon microspheres by subcritical water carbonization and electrocapacitive study

Kurniawan, Alfin, Effendi, Chintya, Ong, L. K., Kurniawan, Fredi, Lin, C. X., Angkawijaya, Artuj Elisa, Ju, Yi-Hsu, Ismadji, Suryadi and Zhao, X. S. (2013) Preparation of nanoporous carbon microspheres by subcritical water carbonization and electrocapacitive study. Electrochimica Acta, 111 99-107. doi:10.1016/j.electacta.2013.07.223


Author Kurniawan, Alfin
Effendi, Chintya
Ong, L. K.
Kurniawan, Fredi
Lin, C. X.
Angkawijaya, Artuj Elisa
Ju, Yi-Hsu
Ismadji, Suryadi
Zhao, X. S.
Title Preparation of nanoporous carbon microspheres by subcritical water carbonization and electrocapacitive study
Journal name Electrochimica Acta   Check publisher's open access policy
ISSN 0013-4686
1873-3859
Publication date 2013-01-01
Sub-type Article (original research)
DOI 10.1016/j.electacta.2013.07.223
Volume 111
Start page 99
End page 107
Total pages 9
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 1603 Demography
1500 Chemical Engineering
Abstract In this work, sugar-derived carbon microspheres (CMSs) with diameters in the range of 5-10 μmand uniform nanopores were prepared using the subcritical water carbonization method, followed bymicrowave-assisted KOH activation. The carbonization was conducted at 3 MPa and moderate tempera-tures (150-170°C) in subcritical water, which is a green dehydrating agent. The formation of the CMSsfrom a sugar solution under subcritical water conditions followed a radical-catalysed emulsion polymer-ization mechanism. The specific surface area and pore volume of the CMSs were found to increase withincreasing the mass ratio of KOH over carbon up to 1:1. Electrocapacitive results showed that a sampleprepared at a KOH to carbon ratio of 1:1 and microwave irradiation level of 70% possessed the highestspecific capacitance (about 179.2 F/g) at a current density of 1 A/g and excellent cycling performance over1000 charging/discharging cycles without significantly loss in capacitance. The specific capacitance andcapacitive retention of this electrode are comparable to that of an electrode prepared from commercialYP-80F activated carbon.
Keyword Capacitance
Microwave activation
Nanoporous carbon microspheres
Subcritical water carbonization
Sugar
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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