Oxidation-Etching Preparation of MnO2 Tubular Nanostructures for High-Performance Supercapacitors

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• 作者：Jixin Zhu ; Wenhui Shi ; Ni Xiao ; Xianhong Rui ; Huiteng Tan ; Xuehong Lu ; Huey Hoon Hng ; Jan Ma ; Qingyu Yan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：May 23, 2012
• 年：2012
• 卷：4
• 期：5
• 页码：2769-2774
• 全文大小：396K
• 年卷期：v.4,no.5(May 23, 2012)
• ISSN：1944-8252

文摘

1D hierarchical tubular MnO₂ nanostructures have been prepared through a facile hydrothermal method using carbon nanofibres (CNFs) as sacrificial template. The morphology of MnO₂ nanostructures can be adjusted by changing the reaction time or annealing process. Polycrystalline MnO₂ nanotubes are formed with a short reaction time (e.g., 10 min) while hierarchical tubular MnO₂ nanostructures composed of assembled nanosheets are obtained at longer reaction times (>45 min). The polycrystalline MnO₂ nanotubes can be further converted to porous nanobelts and sponge-like nanowires by annealing in air. Among all the types of MnO₂ nanostructures prepared, tubular MnO₂ nanostructures composed of assembled nanosheets show optimized charge storage performance when tested as supercapacitor electrodes, for example, delivering an power density of 13.33 kW路kg^鈥? and a energy density of 21.1 Wh路kg^鈥? with a long cycling life over 3000 cycles, which is mainly related to their features of large specific surface area and optimized charge transfer pathway.

Keywords:

MnO₂; carbon nanofibre; nanotubes; nanowires; nanobelts; supercapacitor