Journal
JOURNAL OF POWER SOURCES
Volume 307, Issue -, Pages 401-409Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.01.009
Keywords
Activation; Micropore; Mesopore; Supercapacitor; Two-electrode system
Funding
- National Natural Science Foundation of China [21303257, 51561001, 51262001, 61440051]
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Activated carbon materials have been playing a significant role in addressing the challenges posed with the ever-increasing demand for alternative clean and sustainable energy technologies. In the present study, a facile strategy is proposed for generating porosity in porous carbons by using carton box as the precursor and eutectic NaOH-KOH melt as the activating agent. The prepared carbon materials have a very high specific surface area up to 2731 m(2) g(-1), with large pore volume of 1.68 cm(3) g(-1), which is greater than that of only KOH was used at the same mass ratio. Electrochemical studies based on symmetric supercapacitor devices demonstrating that the NaOH-KOH melt activated porous carbon exhibits significantly improved rate capability in the range of 0.5-75 A g(-1), despite of the similar specific capacitance with respect to KOH activated carbon at a low current density of 0.5 A g(-1). The remarkable deviations in capacitive behavior at high current density for the NaOH-KOH melt activated porous carbon and KOH activated samples highlighting the specific surface area is not the only parameter that determines the capacitive performance especially at high charge-discharge rate. (C) 2016 Elsevier B.V. All rights reserved.
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