Journal
ELECTROCHIMICA ACTA
Volume 136, Issue -, Pages 504-512Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.05.115
Keywords
composite; porous carbons; humic acid; supercapacitors
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Funding
- National Natural Science Foundation of China [51202240, 21103159]
- Xin Jiang Joint Fund of the National Natural Science Foundation of China [U1303191]
- Western Light Foundation of Chinese Academy of Sciences [XBBS201320]
- Young Creative Sci-Tech Talents Cultivation Project of Xinjiang Uyghur Autonomous Region [2013731024]
- Hundred Talents program of Chinese Academy of Sciences [1029471301]
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Herein, humic acid (HA), a kind of biomass (natural polymer), is firstly adopted as a raw material for synthesis of activated carbons (ACs) via a high-temperature activation procedure with KOH. Their porous textures as well as surface groups are fully characterized by N-2 sorption isothermal analysis, SEM, TEM, XPS and IR, respectively. The HA-derived ACs show very high specific surface areas (up to 2990.32 m(2)g(-1)). Furthermore, electrochemical studies such as cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge/discharge (GCD) are carried out to evaluate their specific capacitance and rate capability. It reveals that HA-derived ACs possess high specific capacitance (350 Fg(-1)) at a scan rate of 5 mVs(-1) in I M H2SO4, Moreover, supercapacitors based on HA-derived ACs demonstrate good cycling stability in which the 92% initial capacitance has been retained even after 9000 cycle numbers at a high current density of 1 A g(-1). (C) 2014 Elsevier Ltd. All rights reserved.
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