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

Kurniawan, Alfin and Effendi, Chintya and Ong, L.K. and Kurniawan, Fredi and Lin, C.X. and Angkawijaya, Artik Elisa and Yi-Hsu, Lu and 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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Official URL: http://www.sciencedirect.com/science/article/pii/S...

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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