Three-dimensional Co3O4@NiO hierarchical nanowire arrays for solid-state symmetric supercapacitor with enhanced electrochemical performances

被引:150
作者
Hu, Qingqing [1 ]
Gu, Zhengxiang [1 ]
Zheng, Xiaoting [1 ]
Zhang, Xiaojun [1 ]
机构
[1] Anhui Normal Univ, Coll Chem & Mat Sci, Ctr Nano Sci & Technol, Key Lab Funct Mol Solids,Educ Minist China, Wuhu 241000, Peoples R China
基金
中国国家自然科学基金;
关键词
Supercapacitors; Core-shell nanostructures; High energy density; Synergistic effect; ASYMMETRIC SUPERCAPACITORS; ENERGY-STORAGE; ELECTRODE MATERIALS; LITHIUM BATTERIES; NANONEEDLE ARRAYS; CARBON NANOTUBES; GRAPHENE HYBRID; OXIDE NANOWIRES; NANOSHEET; CHARGE;
D O I
10.1016/j.cej.2016.06.097
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this article, a highly ordered three-dimensional (3D) Co3O4@NiO hierarchical nanowire arrays supported on nickel foam is fabricated by a facile hydrothermal method. The morphologies evolution of Co3O4@NiO nanoarchitecture reaction times and growth temperature are investigated in detail. When investigated as binder-free electrodes for supercapacitors (SCs), such unique Co3O4@NiO core-shell hybrid electrodes exhibit ultrahigh specific capacitances, which are several times larger than the pristine Co3O4 electrode. Because of reduced charge transfer resistances of the core-shell structured composites, electron transfer capability is enhanced and the electrochemical performances are improved. This Co3O4@NiO core-shell nanostructures electrode exhibits an ultrahigh specific capacitance of 1236.67 F g(-1), and excellent cycling stability (5000 cycles) at a current density of 1 A g(-1). The symmetric supercapacitor shows significantly enhanced specific capacitances as high as 720.71 at 1 A g(-1). Moreover, the supercapacitor shows excellent cycling stability with 91.35% capacity retention over 5000 cycles at 1 A g(-1). (C) 2016 Published by Elsevier B.V.
引用
收藏
页码:223 / 231
页数:9
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