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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

(a) CV curves of CuS, CNT, and CuS/CNT composites, and (b) mass-dependent CV curves of the CuS/CNT electrodes in 2 M KOH electrolyte at a 20 mV s−1 scan rate.
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f6: (a) CV curves of CuS, CNT, and CuS/CNT composites, and (b) mass-dependent CV curves of the CuS/CNT electrodes in 2 M KOH electrolyte at a 20 mV s−1 scan rate.

Mentions: Figure 6a plots the CV curves of the electrodes made from CuS, CNT, CuS/CNT with a mass loading of 8 mg cm−2 and pure Ni foam measured at a 20 mV s−1 scan rate. The shapes of the CV prove that the capacitance characteristic is very different from that of the electric double-layer capacitance where the shape is generally close to an ideal rectangular shape. Several important features are noted as follow: (i) Redox peaks were present for the CuS and CuS/CNT electrodes which store electrical energy mainly by means of reversible faradaic redox reactions. This phenomenon may result from the CuS/CuSOH redox pair, basing on the following electrochemical reaction:38


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) CV curves of CuS, CNT, and CuS/CNT composites, and (b) mass-dependent CV curves of the CuS/CNT electrodes in 2 M KOH electrolyte at a 20 mV s−1 scan rate.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6: (a) CV curves of CuS, CNT, and CuS/CNT composites, and (b) mass-dependent CV curves of the CuS/CNT electrodes in 2 M KOH electrolyte at a 20 mV s−1 scan rate.
Mentions: Figure 6a plots the CV curves of the electrodes made from CuS, CNT, CuS/CNT with a mass loading of 8 mg cm−2 and pure Ni foam measured at a 20 mV s−1 scan rate. The shapes of the CV prove that the capacitance characteristic is very different from that of the electric double-layer capacitance where the shape is generally close to an ideal rectangular shape. Several important features are noted as follow: (i) Redox peaks were present for the CuS and CuS/CNT electrodes which store electrical energy mainly by means of reversible faradaic redox reactions. This phenomenon may result from the CuS/CuSOH redox pair, basing on the following electrochemical reaction:38

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