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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.


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(a) Cycling performance of the CuS/CNT electrode with a loading of 8 mg cm−2 measured by charge-discharge; (b) SEM image of the CuS/CNT electrode with a loading of 8 mg cm−2 after 20000 cycles.
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f8: (a) Cycling performance of the CuS/CNT electrode with a loading of 8 mg cm−2 measured by charge-discharge; (b) SEM image of the CuS/CNT electrode with a loading of 8 mg cm−2 after 20000 cycles.

Mentions: The stability of the CuS/CNT electrode with 8 mg cm−2 was measured by galvanostatic charge-discharge (Fig. 8a). The Cs was 1960 F g−1 at a current density of 10 mA cm−2 after 10000 cycles (89% retention of the initial value of 2204 F g−1). Subsequently, the current density was extended to 160 mA cm−2, the Cs remained 1236 F g−1 (85% of 1454F g−1) after another 10000 cycle. In addition, SEM image (Fig. 8b) of the CuS/CNT electrode after cycling test exhibits that CNT were still inserted between the CuS nanosheets, which demonstrates the structural stability of these microspheres as an electrode for supercapacitors. Such an excellent cycling stability can be attributed to the hierarchical sphere-shaped architecture, the well-separated nanosheets were exposed to the electrolyte, offering sufficient diffusion channels. Meanwhile, void spaces between the neighboring nanosheets play the role of ion buffering reservoirs, ensured sufficient redox reactions to take place at high current densities.


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)

(a) Cycling performance of the CuS/CNT electrode with a loading of 8 mg cm−2 measured by charge-discharge; (b) SEM image of the CuS/CNT electrode with a loading of 8 mg cm−2 after 20000 cycles.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f8: (a) Cycling performance of the CuS/CNT electrode with a loading of 8 mg cm−2 measured by charge-discharge; (b) SEM image of the CuS/CNT electrode with a loading of 8 mg cm−2 after 20000 cycles.
Mentions: The stability of the CuS/CNT electrode with 8 mg cm−2 was measured by galvanostatic charge-discharge (Fig. 8a). The Cs was 1960 F g−1 at a current density of 10 mA cm−2 after 10000 cycles (89% retention of the initial value of 2204 F g−1). Subsequently, the current density was extended to 160 mA cm−2, the Cs remained 1236 F g−1 (85% of 1454F g−1) after another 10000 cycle. In addition, SEM image (Fig. 8b) of the CuS/CNT electrode after cycling test exhibits that CNT were still inserted between the CuS nanosheets, which demonstrates the structural stability of these microspheres as an electrode for supercapacitors. Such an excellent cycling stability can be attributed to the hierarchical sphere-shaped architecture, the well-separated nanosheets were exposed to the electrolyte, offering sufficient diffusion channels. Meanwhile, void spaces between the neighboring nanosheets play the role of ion buffering reservoirs, ensured sufficient redox reactions to take place at high current densities.

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