Journal
JOURNAL OF POWER SOURCES
Volume 306, Issue -, Pages 248-257Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.12.029
Keywords
Asymmetric supercapacitor; Activated carbon; Jackfruit; Pseudocapacitance; Energy density
Funding
- National Research Foundation of Korea Grant - Korean Government (MEST) [NRF-2011-C1AAA0010030538]
- National Research Foundation of Korea [2011-0030539] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report the fabrication of high energy asymmetric supercapacitor (ASC) using pseudocapacitive 3D microstructured composite NiCo2O4@Co3O4 and double layer forming activated carbon (AC). The pseudo capacitive electrode is synthesized via a facile two step hydrothermal process and AC is obtained from the bio-waste, Jackfruit (JF) peel by chemical activation. Extensive powder characterization and optimization has been conducted for both electrodes, especially in electrochemical aspect. The ASC is fabricated using JF derived AC as anode and NiCo2O4@Co3O4 cathode in aqueous media. Prior to the ASC assembly, the mass loading between the electrodes are adjusted based on the single electrode performance of both components vs. Ag/AgCl. The ASC is capable of delivering a maximum energy density of 42.5 Wh kg(-1) at power density of 80 W kg(-1). In addition, the ASC rendered excellent cycleability, for example, the cell retains similar to 97% of initial capacitance after 7000 cycles. The outstanding performance of the ASC is originated from the well-developed building blocks of porous electrodes. An impedance study is also conducted to corroborate the excellent performance of NiCo2O4@Co3O4 vs. JF derived AC based ASC. (C) 2015 Elsevier B.V. All rights reserved.
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