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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

TG (black line) and DSC (blue line) curves for CNT (a), and CuS/CNT composites (b) in air at a heating rate of 10 oC min−1.
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f5: TG (black line) and DSC (blue line) curves for CNT (a), and CuS/CNT composites (b) in air at a heating rate of 10 oC min−1.

Mentions: The results obtained from the TG and DSC analyses are shown in Fig. 5. The oxidation of neat CNT into CO2 occurred between 600 and 850 oC (Fig. 5a). In contrast, CuS/CNT composites exhibited two major weight losses in the TG curve along with two corresponding exothermic peaks in the DSC curve (Fig. 5b). The weight loss between 350 and 400 oC was caused by the oxidation of CuS, while that between 600 and 850 oC was attributed to the combustion of CNT. Therefore, the content of carbon in the CuS/CNT composites is estimated to be ca. 18.6%.


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)

TG (black line) and DSC (blue line) curves for CNT (a), and CuS/CNT composites (b) in air at a heating rate of 10 oC min−1.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: TG (black line) and DSC (blue line) curves for CNT (a), and CuS/CNT composites (b) in air at a heating rate of 10 oC min−1.
Mentions: The results obtained from the TG and DSC analyses are shown in Fig. 5. The oxidation of neat CNT into CO2 occurred between 600 and 850 oC (Fig. 5a). In contrast, CuS/CNT composites exhibited two major weight losses in the TG curve along with two corresponding exothermic peaks in the DSC curve (Fig. 5b). The weight loss between 350 and 400 oC was caused by the oxidation of CuS, while that between 600 and 850 oC was attributed to the combustion of CNT. Therefore, the content of carbon in the CuS/CNT composites is estimated to be ca. 18.6%.

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