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Hierarchical, porous CuS microspheres integrated with carbon nanotubes for high-performance supercapacitors.

Lu Y, Liu X, Wang W, Cheng J, Yan H, Tang C, Kim JK, Luo Y - Sci Rep (2015)

Bottom Line: As electrode materials for supercapacitors, the nanocomposites show excellent cyclability and rate capability and deliver an average reversible capacitance as high as 1960 F g(-1) at a current density of 10 mA cm(-2) over 10000 cycles.The high electrochemical performance can be attributed to the synergistic effect of CNTs and the unique microstructure of CuS.The porous structure of CuS also helps to stabilize the electrode structure and facilitates the transport for electrons.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, P. R. China.

ABSTRACT
Carbon nanotubes (CNTs) incorporated porous 3-dimensional (3D) CuS microspheres have been successfully synthesized via a simple refluxing method assisted by PVP. The composites are composed of flower-shaped CuS secondary microspheres, which in turn are assembled with primary nanosheets of 15-30 nm in thickness and fully integrated with CNT. The composites possess a large specific surface area of 189.6 m(2) g(-1) and a high conductivity of 0.471 S cm(-1). As electrode materials for supercapacitors, the nanocomposites show excellent cyclability and rate capability and deliver an average reversible capacitance as high as 1960 F g(-1) at a current density of 10 mA cm(-2) over 10000 cycles. The high electrochemical performance can be attributed to the synergistic effect of CNTs and the unique microstructure of CuS. The CNTs serve as not only a conductive agent to accelerate the transfer of electrons in the composites, but also as a buffer matrix to restrain the volume change and stabilize the electrode structure during the charge/discharge process. The porous structure of CuS also helps to stabilize the electrode structure and facilitates the transport for electrons.

No MeSH data available.


Related in: MedlinePlus

CV curves of the CuS/CNT electrodes with varying mass loadings of (a) 8, (b) 15 and (c) 25 mg cm−2 obtained at different scan rates; and (d) variations of specific capacitance of the CuS/CNT electrodes as a function of scan rate.
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f7: CV curves of the CuS/CNT electrodes with varying mass loadings of (a) 8, (b) 15 and (c) 25 mg cm−2 obtained at different scan rates; and (d) variations of specific capacitance of the CuS/CNT electrodes as a function of scan rate.

Mentions: Figure 7a–c present the CV curves of the CuS/CNT electrodes with different mass loadings measured at different scan rates. The non-rectangular shape of the CV curves for all mass loadings is not obviously changed by increasing the scan rate, and the peak current rises with the scan rate, suggesting that the architecture of CuS/CNT composites is good for fast redox reactions. Also, it is apparent that the redox peaks shift to lower and higher voltages in higher scan rates, respectively. In general, ion diffusion is confined only to the surfaces of the electrode material at a high scan rate4041. The area under the CV curves increased gradually with increasing scan rate for all mass loadings studied, implying an ideal capacitive behavior42.


Hierarchical, porous CuS microspheres integrated with carbon nanotubes for high-performance supercapacitors.

Lu Y, Liu X, Wang W, Cheng J, Yan H, Tang C, Kim JK, Luo Y - Sci Rep (2015)

CV curves of the CuS/CNT electrodes with varying mass loadings of (a) 8, (b) 15 and (c) 25 mg cm−2 obtained at different scan rates; and (d) variations of specific capacitance of the CuS/CNT electrodes as a function of scan rate.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4645118&req=5

f7: CV curves of the CuS/CNT electrodes with varying mass loadings of (a) 8, (b) 15 and (c) 25 mg cm−2 obtained at different scan rates; and (d) variations of specific capacitance of the CuS/CNT electrodes as a function of scan rate.
Mentions: Figure 7a–c present the CV curves of the CuS/CNT electrodes with different mass loadings measured at different scan rates. The non-rectangular shape of the CV curves for all mass loadings is not obviously changed by increasing the scan rate, and the peak current rises with the scan rate, suggesting that the architecture of CuS/CNT composites is good for fast redox reactions. Also, it is apparent that the redox peaks shift to lower and higher voltages in higher scan rates, respectively. In general, ion diffusion is confined only to the surfaces of the electrode material at a high scan rate4041. The area under the CV curves increased gradually with increasing scan rate for all mass loadings studied, implying an ideal capacitive behavior42.

Bottom Line: As electrode materials for supercapacitors, the nanocomposites show excellent cyclability and rate capability and deliver an average reversible capacitance as high as 1960 F g(-1) at a current density of 10 mA cm(-2) over 10000 cycles.The high electrochemical performance can be attributed to the synergistic effect of CNTs and the unique microstructure of CuS.The porous structure of CuS also helps to stabilize the electrode structure and facilitates the transport for electrons.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, P. R. China.

ABSTRACT
Carbon nanotubes (CNTs) incorporated porous 3-dimensional (3D) CuS microspheres have been successfully synthesized via a simple refluxing method assisted by PVP. The composites are composed of flower-shaped CuS secondary microspheres, which in turn are assembled with primary nanosheets of 15-30 nm in thickness and fully integrated with CNT. The composites possess a large specific surface area of 189.6 m(2) g(-1) and a high conductivity of 0.471 S cm(-1). As electrode materials for supercapacitors, the nanocomposites show excellent cyclability and rate capability and deliver an average reversible capacitance as high as 1960 F g(-1) at a current density of 10 mA cm(-2) over 10000 cycles. The high electrochemical performance can be attributed to the synergistic effect of CNTs and the unique microstructure of CuS. The CNTs serve as not only a conductive agent to accelerate the transfer of electrons in the composites, but also as a buffer matrix to restrain the volume change and stabilize the electrode structure during the charge/discharge process. The porous structure of CuS also helps to stabilize the electrode structure and facilitates the transport for electrons.

No MeSH data available.


Related in: MedlinePlus