Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 27, Pages 10217-10222Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.09.007
Keywords
Supercapacitor; Platinum nanoparticles; Activated carbon monolith; Electrochemical properties
Categories
Funding
- MOHE [UKM-GUP-NBT-08-27-107]
- Fundamental Research Grant [UKM-ST-07-FRGS 0030-2009]
- UKM [UKM-OUP-NBT-29-145/2011]
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In this study, an improvement in the supercapacitive behavior of a symmetrical carbon-based supercapacitor is achieved by modifying the stainless steel current collector using platinum nanoparticles (PtNs). The PtNs are allowed to grow on the surface of the current collectors before they make contact with the surface of activated carbon electrode monoliths prepared from pre-carbonized rubber wood sawdust. All of the methods used in the present study, i.e., electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge-discharge tests provide consistent results, suggesting that the monolithic form of carbon electrodes and PtNs play a significant role in reducing the equivalent series resistance from 337 to 18 m Omega and to increase the specific capacitance from 108 to 151 Fg(-1). This change improves the specific energy from 2.5 to 3.3 Wh kg(-1) and the specific power from 275 to 288W kg(-1), respectively. (C) 2011 Elsevier Ltd. All rights reserved.
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