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Three‐Dimensional Hierarchical NiCo 2 O 4 Nanosheets/Carbon Nanotubes/Carbon Cloth as a Flexible Electrode Material for Electrochemical Capacitors
Author(s) -
Zhang JiaNan,
Liu Ping,
Jin LiNa,
Jin Chun,
Bian ShaoWei
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701767
Subject(s) - materials science , carbon nanotube , electrode , electrochemistry , carbon fibers , supercapacitor , chemical engineering , nanotechnology , power density , capacitance , capacitor , composite material , composite number , voltage , chemistry , power (physics) , physics , quantum mechanics , engineering
In order to achieve superior energy storage performances, the design of electrode materials with complex heterostructure has attracted intensive attention. In this study, the NiCo 2 O 4 /carbon nanotubes/carbon cloth (NiCo 2 O 4 /CNTs/CC) composite electrode material with a three‐dimensional (3D) and hierarchically porous structure was prepared by using ZnO‐assisted template method and followed the electrodeposition and thermal decomposition processes. The vertical carbon nanotube arrays on carbon cloth formed a 3D conductive network, which facilitates to achieve fast electron transportation. After further growing ultrathin NiCo 2 O 4 nanosheets on the surface of carbon nanotubes (CNTs), the resultant NiCo 2 O 4 /CNTs/CC electrode material exhibited remarkable electrochemical performances. It showed a maximum specific capacitance of 1518 F/g at a scan rate of 5 mV/s in 2 mol/L KOH aqueous solution and excellent stability under the conditions of long term cycling, mechanical bending and twisting conditions. The solid‐state symmetric electrochemical capacitor assembled by the NiCo 2 O 4 /CNTs/CC electrode material delivered an energy density of 13.0 Wh/kg at the power density of 1276 W/kg.