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, 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.wima.ac.id/id/eprint/5179

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