Journal
CARBON
Volume 52, Issue -, Pages 337-346Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2012.09.035
Keywords
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Funding
- Mexican National Council of Science and Technology (CONACYT)
- UK Engineering and Physical Science Research Council [EP/HO19596]
- Mathematics, Physical and Life Sciences division, Oxford University
- EPSRC [EP/H019596/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H019596/1] Funding Source: researchfish
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Graphene electrodes of high power density were manufactured by a surfactant-water based exfoliation method followed by a scaleable spray-deposition process. Cyclic voltammetry and galvanostatic charge-discharge experiments revealed a combination of electric double layer and pseudocapacitive behavior that, unlike the many graphene-oxide derived electrodes, was maintained to unusually high scan rates of 10,000 mV s(-1), reaching a maximum capacitance of 543 mu F cm(-2) and with a capacitive retention of 57% at 10,000 mV s(-1) The performance of graphene electrodes was contrasted with carboxylated single walled carbon nanotubes that showed a sharp decrease in capacitance above 200 mV s(-1). Electrochemical impedance spectroscopy analysis showed a fast capacitor response of 17.4 ms for as manufactured electrodes which was further improved to 2.3 ms for surfactant-free 40 nm thick electrodes. A maximum energy density of 75.4 nW h cm(-2) gradually decreased as power density increased up to 2.6 mW cm(-2). Graphene electrodes showed 100% capacitance retention for 5000 cycles at the high power scan rate of 10,000 mV s(-1). (C) 2012 Elsevier Ltd. All rights reserved.
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