期刊
ACS APPLIED MATERIALS & INTERFACES
卷 4, 期 5, 页码 2769-2774出版社
AMER CHEMICAL SOC
DOI: 10.1021/am300388u
关键词
MnO2; carbon nanofibre; nanotubes; nanowires; nanobelts; supercapacitor
资金
- MOE (Singapore) [RG 31/08]
- Singapore Ministry of Education [MOE2010-T2-1-017]
- A*STAR SERC [1021700144]
- Singapore MPA [23/04.15.03, RDP 009/10/102, MPA 23/04.15.03, RDP 020/10/113]
- [NRF2009EWT-CERP001-026]
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.kg(-1) and a energy density of 21.1 Wh.kg(-1) 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.
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