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Facile Synthesis of Coaxial CNTs/MnOx-Carbon Hybrid Nanofibers and Their Greatly Enhanced Lithium Storage Performance.

Yang Z, Lv J, Pang H, Yan W, Qian K, Guo T, Guo Z - Sci Rep (2015)

Bottom Line: Carbon nanotubes (CNTs)/MnOx-Carbon hybrid nanofibers have been successfully synthesized by the combination of a liquid chemical redox reaction (LCRR) and a subsequent carbonization heat treatment.The nanostructures exhibit a unique one-dimensional core/shell architecture, with one-dimensional CNTs encapsulated inside and a MnOx-carbon composite nanoparticle layer on the outside.The particular porous characteristics with many meso/micro holes/pores, the highly conductive one-dimensional CNT core, as well as the encapsulating carbon matrix on the outside of the MnOx nanoparticles, lead to excellent electrochemical performance of the electrode.

View Article: PubMed Central - PubMed

Affiliation: National &Local United Engineering Laboratory of Flat Panel Display Technology, Fuzhou University, Fuzhou 350002, P. R. China.

ABSTRACT
Carbon nanotubes (CNTs)/MnOx-Carbon hybrid nanofibers have been successfully synthesized by the combination of a liquid chemical redox reaction (LCRR) and a subsequent carbonization heat treatment. The nanostructures exhibit a unique one-dimensional core/shell architecture, with one-dimensional CNTs encapsulated inside and a MnOx-carbon composite nanoparticle layer on the outside. The particular porous characteristics with many meso/micro holes/pores, the highly conductive one-dimensional CNT core, as well as the encapsulating carbon matrix on the outside of the MnOx nanoparticles, lead to excellent electrochemical performance of the electrode. The CNTs/MnOx-Carbon hybrid nanofibers exhibit a high initial reversible capacity of 762.9 mAhg(-1), a high reversible specific capacity of 560.5 mAhg(-1) after 100 cycles, and excellent cycling stability and rate capability, with specific capacity of 396.2 mAhg(-1) when cycled at the current density of 1000 mAg(-1), indicating that the CNTs/MnOx-Carbon hybrid nanofibers are a promising anode candidate for Li-ion batteries.

No MeSH data available.


Related in: MedlinePlus

Electrochemical performances of MnO2 nanoparticle, CNTs/MnOx hybrid nanomaterial, and CNTs/MnOx-Carbon hybrid nanofiber electrodes cycled between 0.01 and 3.0 V vs. Li+/Li:(a) Cyclic voltammograms of CNTs/MnOx-Carbon hybrid nanomaterial electrode of the first 5 cycles at a scan rate of 0.1 mVs−1 in the voltage range of 0.01–3.0 V. (b) Voltage profiles for the first cycle of the MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber, and CNTs/MnOx-Carbon hybrid nanofiber electrodes at the current density of 100 mAg−1. (c) Capacity vs. cycle number curves and coulombic efficiency from the first cycle to the 101st cycle for the MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber and CNTs/MnOx-Carbon hybrid nanofiber electrodes at the current density of 100 mAg−1, with cutoff voltage betwen 0.01 and 3.0 V. (d) Rate capabilities of MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber, and CNTs/MnOx-Carbon hybrid nanofiber electrodes at various current densities (100 mAg−1, 200 mAg−1, 500 mAg−1, 1000 mAg−1).
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f5: Electrochemical performances of MnO2 nanoparticle, CNTs/MnOx hybrid nanomaterial, and CNTs/MnOx-Carbon hybrid nanofiber electrodes cycled between 0.01 and 3.0 V vs. Li+/Li:(a) Cyclic voltammograms of CNTs/MnOx-Carbon hybrid nanomaterial electrode of the first 5 cycles at a scan rate of 0.1 mVs−1 in the voltage range of 0.01–3.0 V. (b) Voltage profiles for the first cycle of the MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber, and CNTs/MnOx-Carbon hybrid nanofiber electrodes at the current density of 100 mAg−1. (c) Capacity vs. cycle number curves and coulombic efficiency from the first cycle to the 101st cycle for the MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber and CNTs/MnOx-Carbon hybrid nanofiber electrodes at the current density of 100 mAg−1, with cutoff voltage betwen 0.01 and 3.0 V. (d) Rate capabilities of MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber, and CNTs/MnOx-Carbon hybrid nanofiber electrodes at various current densities (100 mAg−1, 200 mAg−1, 500 mAg−1, 1000 mAg−1).

Mentions: The electrochemical performances of the MnO2 nanoparticles, and the CNTs/MnOx and CNTs/MnOx-Carbon hybrid nanofibers electrodes, including in galvanostatic discharge-charge cycling and cyclic voltammetry, have been systematically investigated (Fig. 5 and Supporting Information Fig. S6(a)). Cyclic voltammograms (CVs) of the CNTs/MnOx-Carbon hybrid nanofibers at a scan rate of 0.1 mVs−1 from the 1st cycle to the 5th cycle, with the cut-off voltage window between 0.01 and 3.0 V, are presented in Fig. 5(a), while those of the CNTs/MnOx hybrid nanofibers, including the 1st, 2nd, and 5th cycles, are presented in Fig. S6(a). The curve of the first cycle is obviously different from those of the later ones, which is possibly attributable to the formation of an inactive solid electrolyte interphase (SEI)3642 at the first cycle. From the 2nd cycle onward, highly reversible CV curves are obtained. From the 2nd cycle on, there is an obvious anodic peak at about 1.43 V vs. Li/Li+ and a broad cathodic peak at 0.89 V. The two peaks are probably attributable to the reversible oxidation/reduction between manganese oxide and lithium41. Whereas, the cathodic/anodic peak pair at 0.06 V and 0.349 V is possibly attributable to the lithium ion insertion into/extraction out of the carbon matrix. Noticeably, there is one unknown peak at 2.17 V in all the cycles, which needs further investigation.


Facile Synthesis of Coaxial CNTs/MnOx-Carbon Hybrid Nanofibers and Their Greatly Enhanced Lithium Storage Performance.

Yang Z, Lv J, Pang H, Yan W, Qian K, Guo T, Guo Z - Sci Rep (2015)

Electrochemical performances of MnO2 nanoparticle, CNTs/MnOx hybrid nanomaterial, and CNTs/MnOx-Carbon hybrid nanofiber electrodes cycled between 0.01 and 3.0 V vs. Li+/Li:(a) Cyclic voltammograms of CNTs/MnOx-Carbon hybrid nanomaterial electrode of the first 5 cycles at a scan rate of 0.1 mVs−1 in the voltage range of 0.01–3.0 V. (b) Voltage profiles for the first cycle of the MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber, and CNTs/MnOx-Carbon hybrid nanofiber electrodes at the current density of 100 mAg−1. (c) Capacity vs. cycle number curves and coulombic efficiency from the first cycle to the 101st cycle for the MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber and CNTs/MnOx-Carbon hybrid nanofiber electrodes at the current density of 100 mAg−1, with cutoff voltage betwen 0.01 and 3.0 V. (d) Rate capabilities of MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber, and CNTs/MnOx-Carbon hybrid nanofiber electrodes at various current densities (100 mAg−1, 200 mAg−1, 500 mAg−1, 1000 mAg−1).
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Show All Figures
getmorefigures.php?uid=PMC4664925&req=5

f5: Electrochemical performances of MnO2 nanoparticle, CNTs/MnOx hybrid nanomaterial, and CNTs/MnOx-Carbon hybrid nanofiber electrodes cycled between 0.01 and 3.0 V vs. Li+/Li:(a) Cyclic voltammograms of CNTs/MnOx-Carbon hybrid nanomaterial electrode of the first 5 cycles at a scan rate of 0.1 mVs−1 in the voltage range of 0.01–3.0 V. (b) Voltage profiles for the first cycle of the MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber, and CNTs/MnOx-Carbon hybrid nanofiber electrodes at the current density of 100 mAg−1. (c) Capacity vs. cycle number curves and coulombic efficiency from the first cycle to the 101st cycle for the MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber and CNTs/MnOx-Carbon hybrid nanofiber electrodes at the current density of 100 mAg−1, with cutoff voltage betwen 0.01 and 3.0 V. (d) Rate capabilities of MnO2 nanoparticle, CNTs/MnOx hybrid nanofiber, and CNTs/MnOx-Carbon hybrid nanofiber electrodes at various current densities (100 mAg−1, 200 mAg−1, 500 mAg−1, 1000 mAg−1).
Mentions: The electrochemical performances of the MnO2 nanoparticles, and the CNTs/MnOx and CNTs/MnOx-Carbon hybrid nanofibers electrodes, including in galvanostatic discharge-charge cycling and cyclic voltammetry, have been systematically investigated (Fig. 5 and Supporting Information Fig. S6(a)). Cyclic voltammograms (CVs) of the CNTs/MnOx-Carbon hybrid nanofibers at a scan rate of 0.1 mVs−1 from the 1st cycle to the 5th cycle, with the cut-off voltage window between 0.01 and 3.0 V, are presented in Fig. 5(a), while those of the CNTs/MnOx hybrid nanofibers, including the 1st, 2nd, and 5th cycles, are presented in Fig. S6(a). The curve of the first cycle is obviously different from those of the later ones, which is possibly attributable to the formation of an inactive solid electrolyte interphase (SEI)3642 at the first cycle. From the 2nd cycle onward, highly reversible CV curves are obtained. From the 2nd cycle on, there is an obvious anodic peak at about 1.43 V vs. Li/Li+ and a broad cathodic peak at 0.89 V. The two peaks are probably attributable to the reversible oxidation/reduction between manganese oxide and lithium41. Whereas, the cathodic/anodic peak pair at 0.06 V and 0.349 V is possibly attributable to the lithium ion insertion into/extraction out of the carbon matrix. Noticeably, there is one unknown peak at 2.17 V in all the cycles, which needs further investigation.

Bottom Line: Carbon nanotubes (CNTs)/MnOx-Carbon hybrid nanofibers have been successfully synthesized by the combination of a liquid chemical redox reaction (LCRR) and a subsequent carbonization heat treatment.The nanostructures exhibit a unique one-dimensional core/shell architecture, with one-dimensional CNTs encapsulated inside and a MnOx-carbon composite nanoparticle layer on the outside.The particular porous characteristics with many meso/micro holes/pores, the highly conductive one-dimensional CNT core, as well as the encapsulating carbon matrix on the outside of the MnOx nanoparticles, lead to excellent electrochemical performance of the electrode.

View Article: PubMed Central - PubMed

Affiliation: National &Local United Engineering Laboratory of Flat Panel Display Technology, Fuzhou University, Fuzhou 350002, P. R. China.

ABSTRACT
Carbon nanotubes (CNTs)/MnOx-Carbon hybrid nanofibers have been successfully synthesized by the combination of a liquid chemical redox reaction (LCRR) and a subsequent carbonization heat treatment. The nanostructures exhibit a unique one-dimensional core/shell architecture, with one-dimensional CNTs encapsulated inside and a MnOx-carbon composite nanoparticle layer on the outside. The particular porous characteristics with many meso/micro holes/pores, the highly conductive one-dimensional CNT core, as well as the encapsulating carbon matrix on the outside of the MnOx nanoparticles, lead to excellent electrochemical performance of the electrode. The CNTs/MnOx-Carbon hybrid nanofibers exhibit a high initial reversible capacity of 762.9 mAhg(-1), a high reversible specific capacity of 560.5 mAhg(-1) after 100 cycles, and excellent cycling stability and rate capability, with specific capacity of 396.2 mAhg(-1) when cycled at the current density of 1000 mAg(-1), indicating that the CNTs/MnOx-Carbon hybrid nanofibers are a promising anode candidate for Li-ion batteries.

No MeSH data available.


Related in: MedlinePlus