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

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• 作者：Sucheng Hou ; Guanhua Zhang ; Wei Zeng ; Jian Zhu ; Feilong Gong ; Feng Li ; Huigao Duan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：August 27, 2014
• 年：2014
• 卷：6
• 期：16
• 页码：13564-13570
• 全文大小：437K
• ISSN：1944-8252

文摘

A hierarchical core鈥搒hell 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鈥搒hell structure electrode displays better pseudocapacitive behaviors in 2 M KOH, including high areal specific capacitance values of 1.18 F cm^鈥? at 5 mA cm^鈥? and 0.6 F cm^鈥? at 30 mA cm^鈥? 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^鈥?. The enhanced pseudocapacitive behaviors are mainly due to the unique hierarchical core鈥搒hell structure and the synergistic effect of combining ZnO nanorod arrays and NiO/MoO₂ composite nanosheets. This novel hierarchical core鈥搒hell structure shows promise for use in next-generation supercapacitors.

Keywords:

supercapacitors; ZnO nanorod arrays; NiO/MoO₂ composite nanosheets; core鈭抯hell structure