Asymmetric supercapacitor based on carbon nanofibers as the anode and two-dimensional copper cobalt oxide nanosheets as the cathode

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 366; pp. 390 - 403
• Main Authors: Suresh Babu, R., Vinodh, R., de Barros, A.L.F., Samyn, L.M., Prasanna, K., Maier, M.A., Alves, C.H.F., Kim, Hee-Je
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.06.2019
• Subjects: Asymmetric supercapacitors; Charge-discharge; CuCo2O4; Energy storage; Porous carbon; Charge-discharge; CuCo2O4; Porous carbon; Energy storage; Asymmetric supercapacitors
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2019.02.108

[Display omitted] •Hyperporous carbon nanofibers are obtained from hypercross-linked polymers.•Arrays of porous 2D copper cobalt oxide is prepared by hydrothermal method.•Aforesaid electrode materials is used for asymmetric supercapacitor (ASC) assembly.•Assembled CCO-NS//HCP-CNF ASC device showed an ultra-high energy and power density.•The novel ASC device showed a good stability with 91.1% retention after 5000 cycles. This paper reports the fabrication of an ultra-high energy and power density asymmetric supercapacitor (ASC) containing a novel porous carbon nanofiber derived from hypercross-linked polymers (HCP-CNF) and two-dimensional copper cobalt oxide nanosheets (CCO-NS) as the negative and positive electrodes, respectively. The micropore-enriched HCP-CNF is obtained from a facile Friedel-Crafts reaction with naphthalene and α, α′-dichloro-p-xylene as the starting material. The CCO-NS have been prepared by a simple and inexpensive hydrothermal synthesis using polyvinylpyrrolidone (PVP) as a shape controlling agent. The fabricated CCO-NS//HCP-CNF ASC device exhibit a high specific capacitance, 244 F g−1 at a current density of 1 A g−1, owing to the unique porous architecture of CCO-NS and the interconnected microporous carbon skeleton with a high surface area of HCP-CNF. Furthermore, the assembled ASC device show an ultra-high energy density of 25.1 Wh kg−1 at a power density of 400 W kg−1 with maximum operating voltage of 1.60 V. The electrode shows good capacitance retention (91.1%) after 5000 cycles in a 3 M aqueous KOH solution. In addition, two ASC devices are connected in series powered a 5 mm diameter LED indicator for approximately 30 min, highlighting its efficient power supply.