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Acta Physico-Chimica Sinca  2015, Vol. 31 Issue (11): 2220-2228    DOI: 10.3866/PKU.WHXB201510131
PHYSICAL CHEMISTRY OF MATERIALS     
Preparation and Supercapacitor Properties of Carbon-Coated SnO2 Hollow Fibers
Xiao-Mei. HAN1,Yan-Bo. WU2,*(),Heng-Yan. ZHAO2,Jun. BI2,Bin-Bin. WEI2
1 College of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, P. R. China
2 College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, P. R. China
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Abstract  

A new carbon-coated SnO2 hollow fiber was successfully prepared by coaxial electrospinning, and its supercapacitor properties were well studied. The surface morphology and structure were examined using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the Brunauer-Emmett-Teller (BET) method. The results showed hollow fibers of average diameter 1 μm and carbon-coated SnO2 particles of average size 3-15 nm uniformly distributed on the fiber shell. The surface area was 565 m2·g-1. In a three-electrode system, the electrode achieved a respectable specific capacitance of 397.5 F·g-1 at 0.25 A·g-1, and the capacitance retained ratio was still 88% of the initial value after 3000 cycles at 1.0 A·g-1. In the case of a symmetrical two-electrode system, the electrode achieved a specific capacitance of 162.0 F·g-1 at 0.25 A·g-1 current density, and the capacitance retained ratio was 84% of the initial value after 3000 cycles at 1.0 A·g-1.



Key wordsCoaxial electrospinning      Carbon-coated nano-SnO2      Hollow structure      Supercapacitor     
Received: 27 April 2015      Published: 13 October 2015
MSC2000:  O646  
Fund:  the National Natural Science Foundation of China(21076028);National Training Programs of lnnovation andEntreprenurship for Undergraduates, China(201410150016)
Corresponding Authors: Yan-Bo. WU     E-mail: wuyanbo_djd@126.com
Cite this article:

Xiao-Mei. HAN,Yan-Bo. WU,Heng-Yan. ZHAO,Jun. BI,Bin-Bin. WEI. Preparation and Supercapacitor Properties of Carbon-Coated SnO2 Hollow Fibers. Acta Physico-Chimica Sinca, 2015, 31(11): 2220-2228.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201510131     OR     http://www.whxb.pku.edu.cn/Y2015/V31/I11/2220

Fig 1 XRD pattern (a) and Raman scattering spectrum (b) of carbon-coated SnO2 hollow fibers
Fig 2 SEM images of carbon-coated SnO2 hollow fibers at different magnifications
Fig 3 TEM (a), selected area electron diffraction (b), and high resolution transmission electron microscopy (c) images of carbon-coated SnO2 hollow fibers
Fig 4 N2 adsorption-desorption isotherms and pore size distribution curves of carbon-coated SnO2 hollow fibers (inset)
Fig 5 Cyclic voltammogram curves of carbon-coated SnO2 hollow fibers at different scan rates
Fig 6 Charge-discharge curves (a) and specific capacitances (b) of carbon-coated SnO2 hollow fibers at different current densities
Fig 7 Electrochemical impedance spectroscopy of carbon-coated SnO2 hollow fibers
Fig 8 Cycle life of carbon-coated SnO2 hollow fibers
Fig 9 Cyclic voltammogram curves of carbon-coated SnO2 hollow fibers at a scan rate of 10 mV · s–1 as positive and negative electrodes
Fig 10 Cyclic voltammograms curve of (a) nano-SnO2 and carbon-coated SnO2 hollow fibers symmetric supercapacitor and (b) carbon-coated SnO2 hollow fibers symmetric supercapacitor at different scan rates
Fig 11 Charge-discharge curves of nano-SnO2 and carbon-coated SnO2 hollow fibers symmetric supercapacitor (a), charge-discharge curves (b), and specific capacitances (c) of carbon-coated SnO2 hollow fibers symmetric supercapacitor at different current densities
Fig 12 Curves of Rangone plots of energy density and power density of nano-SnO2 and carbon-coated SnO2 hollow fibers symmetric supercapacitor
Fig 13 Cycle life of nano-SnO2 and carbon-coated SnO2 hollow fibers symmetric supercapacitor
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