Advanced asymmetric supercapacitors based on CNT@Ni(OH)2 core-shell composites and 3D graphene networks

被引：143

作者：

Yi, Huan ^{[1
,2
]}

Wang, Huanwen ^{[1
,2
]}

Jing, Yuting ^{[1
,2
]}

Peng, Tianquan ^{[1
,2
]}

Wang, Yiran ^{[3
]}

Guo, Jiang ^{[3
]}

He, Qingliang ^{[3
]}

Guo, Zhanhu ^{[3
]}

Wang, Xuefeng ^{[1
,2
]}

机构：

[1] Tongji Univ, Dept Chem, Shanghai 200092, Peoples R China

[2] Tongji Univ, Shanghai Key Lab Chem Assessment & Sustainabil, Shanghai 200092, Peoples R China

[3] Univ Tennessee, Dept Chem & Biochem Engn, Integrated Composites Lab, Knoxville, TN 37996 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2015年 / 3卷 / 38期

关键词：

HIGH-ENERGY; NICKEL-HYDROXIDE; ELECTROCHEMICAL CAPACITOR; CARBON NANOTUBES; OXIDE; HYDROGEL; DENSITY; REVERSIBILITY; ELECTRODES; NANOSHEETS;

D O I：

10.1039/c5ta06174a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Asymmetric supercapacitors (ASCs) with carbon nanotube@nickel hydroxide nanosheet (CNT@Ni(OH)(2)) core-shell composites as positive electrodes and three-dimensional (3D) graphene networks (3DGNs) as negative electrodes were reported in aqueous KOH electrolyte. The CNT@Ni(OH)(2) core-shell composites were prepared through a facile chemical bath deposition method, while 3DGNs were obtained by freeze-drying of graphene hydrogels. By virtue of their unique microstructures, superb electrochemical properties were achieved in a three-electrode system, e.g., 1136 F g(-1) at 2 A g(-1) for the CNT@Ni(OH)(2) electrode within 0-0.5 V and 203 F g(-1) at 1 A g(-1) for the 3DGN electrode within -1-0 V. Benefiting from these merits, the as-fabricated CNT@Ni(OH)(2)//3DGN ASC showed a maximum energy density of 44.0 W h kg(-1) at a power density of 800 W kg(-1) and even retained 19.6 W h kg(-1) at 16 000 W kg-(1) in the voltage region of 0-1.6 V.

引用

页码：19545 / 19555

页数：11

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