期刊
NANO LETTERS
卷 11, 期 3, 页码 1215-1220出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl104205s
关键词
Supercapacitor; MnO2; Zn2SnO4 nanowire; carbon microfiber; flexible; composite
类别
资金
- U.S. Army Research Office [W911NF-07-1-0320]
- National Science Foundation [CMMI-0653651, CMMI-0968843]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0968843] Funding Source: National Science Foundation
We demonstrate the design and fabrication of a novel flexible nanoarchitecture by facile coating ultrathin (several nanometers thick) films of MnO2 to highly electrical conductive Zn2SnO4 (ZTO) nanowires grown radially on carbon microfibers (CMFs) to achieve high specific capacitance, high-energy density, high-power density, and long-term life for supercapacitor electrode applications. The crystalline ZTO nanowires grown on CMFs were uniquely served as highly conductive cores to support a highly electrolytic accessible surface area of redox active MnO2 shells and also provide reliable electrical connections to the MnO2 shells. The maximum specific capacitances of 621.6 F/g (based on pristine MnO2) by cyclic voltammetry (CV) at a scan rate of 2 mV/s and 642.4 F/g by chronopotentiometry at a current density of 1 A/g were achieved in 1 M Na2SO4 aqueous solution. The hybrid MnO2/ZTO/CMF hybrid composite also exhibited excellent rate capability with specific energy of 36.8 Wh/kg and specific power of 32 kW/kg at current density of 40 A/g, respectively, and good long-term cycling stability (only 1.2% loss of its initial specific capacitance after 1000 cycles). These results suggest that such MnO2/ZTO/CF hybrid composite architecture is very promising for next generation high-performance supercapacitors.
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