Hierarchical Core-Shell Structure of ZnO Nanorod@NiO/MoO2 Composite Nanosheet Arrays for High-Performance Supercapacitors

被引：82

作者：

Hou, Sucheng ^{[1
]}

Zhang, Guanhua ^{[1
]}

Zeng, Wei ^{[1
]}

Zhu, Jian ^{[1
]}

Gong, Feilong ^{[2
]}

Li, Feng ^{[2
]}

Duan, Huigao ^{[1
]}

机构：

[1] Hunan Univ, Coll Phys & Microelect, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China

[2] Zhengzhou Univ Light Ind, State Lab Surface & Interface Sci & Technol, Zhengzhou 450002, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2014年 / 6卷 / 16期

基金：

中国国家自然科学基金;

关键词：

supercapacitors; ZnO nanorod arrays; NiO/MoO2 composite nanosheets; core-shell structure; NANOTUBE ARRAYS; ELECTRODE; OXIDE; MNO2; NANOWIRES; NANORODS; DESIGN;

D O I：

10.1021/am5028154

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A hierarchical core-shell structure of ZnO nanorod@NiO/MoO2 composite nanosheet arrays on nickel foam substrate for high-performance supercapacitors was constructed by a two-step solution-based method involving two hydrothermal processes followed by a calcination treatment. Compared to one composed of pure NiO/MoO2 composite nanosheets, the hierarchical core-shell structure electrode displays better pseudocapacitive behaviors in 2 M KOH, including high areal specific capacitance values of 1.18 F cm(-2) at 5 mA cm(-2) and 0.6 F cm(-2) at 30 mA cm(-2) as well as relatively good rate capability at high current densities. Furthermore, it also shows remarkable cycle stability, remaining at 91.7% of the initial value even after 4000 cycles at a current density of 10 mA cm-2. The enhanced pseudocapacitive behaviors are mainly due to the unique hierarchical core-shell structure and the synergistic effect of combining ZnO nanorod arrays and NiO/MoO2 composite nanosheets. This novel hierarchical core-shell structure shows promise for use in next-generation supercapacitors.

引用

页码：13564 / 13570

页数：7

共 41 条

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