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Phase-controlled synthesis of α-NiS nanoparticles confined in carbon nanorods for high performance supercapacitors.

Sun C, Ma M, Yang J, Zhang Y, Chen P, Huang W, Dong X - Sci Rep (2014)

Bottom Line: A facile and phase-controlled synthesis of α-NiS nanoparticles (NPs) embedded in carbon nanorods (CRs) is reported by in-situ sulfurating the preformed Ni/CRs.The nanopore confinement by the carbon matrix is essential for the formation of α-NiS and preventing its transition to β-phase, which is in strong contrast to large aggregated β-NiS particles grown freely without the confinement of CRs.While the high electrochemical stability (approximately 100% retention of specific capacitance after 2000 charge/discharge cycles) is attributed to the supercapacitor-battery electrode, which makes synergistic effect of capacitor (CRs) and battery (NiS NPs) components rather than a merely additive composite.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Flexible Electronics (KLOFE) &Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China.

ABSTRACT
A facile and phase-controlled synthesis of α-NiS nanoparticles (NPs) embedded in carbon nanorods (CRs) is reported by in-situ sulfurating the preformed Ni/CRs. The nanopore confinement by the carbon matrix is essential for the formation of α-NiS and preventing its transition to β-phase, which is in strong contrast to large aggregated β-NiS particles grown freely without the confinement of CRs. When used as electrochemical electrode, the hybrid electrochemical charge storage of the ultrasmall α-NiS nanoparticels dispersed in CRs is benefit for the high capacitor (1092, 946, 835, 740 F g(-1) at current densities of 1, 2, 5, 10 A g(-1), respectively.). While the high electrochemical stability (approximately 100% retention of specific capacitance after 2000 charge/discharge cycles) is attributed to the supercapacitor-battery electrode, which makes synergistic effect of capacitor (CRs) and battery (NiS NPs) components rather than a merely additive composite. This work not only suggests a general approach for phase-controlled synthesis of nickel sulfide but also opens the door to the rational design and fabrication of novel nickel-based/carbon hybrid supercapacitor-battery electrode materials.

No MeSH data available.


Related in: MedlinePlus

Electrochemical properties of α-NiS/CRs, β-NiS/CRs composites and bare CRs.(a) CV curves of α-, β-NiS/CRs composites and bare CRs at 5 mV s−1. (b) Specific capacitance of α-, β-NiS/CRs composites and bare CRs at various current density. (c) Cycling performance, and (d) Nyquist plots of the EIS of α and β-NiS/CRs composites.
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f3: Electrochemical properties of α-NiS/CRs, β-NiS/CRs composites and bare CRs.(a) CV curves of α-, β-NiS/CRs composites and bare CRs at 5 mV s−1. (b) Specific capacitance of α-, β-NiS/CRs composites and bare CRs at various current density. (c) Cycling performance, and (d) Nyquist plots of the EIS of α and β-NiS/CRs composites.

Mentions: We speculate that α-NiS/CRs composite could be a good electrode material for charge storage owing to its unique hierarchical structure, conductive nature and high electrochemical performance expected from α-NiS NPs. Fig. 3a shows the cyclic voltammetry (CV) analysis of bare CRs and the two composites in the potential range of 0–0.50 V (vs. standard calomel electrode). α-NiS/CRs shows a much larger CV area than that from β-NiS/CRs and bare CRs, indicating a higher capacitance (also see CV profiles at different scan rates shown in Fig. S4a and S4c). The redox peaks of α-NiS/CRs is originated from the following NiMH battery-like reaction: while the redox peaks of β-NiS/CRs (which disappear after the first cycle) is due to the following irreversible reaction21:


Phase-controlled synthesis of α-NiS nanoparticles confined in carbon nanorods for high performance supercapacitors.

Sun C, Ma M, Yang J, Zhang Y, Chen P, Huang W, Dong X - Sci Rep (2014)

Electrochemical properties of α-NiS/CRs, β-NiS/CRs composites and bare CRs.(a) CV curves of α-, β-NiS/CRs composites and bare CRs at 5 mV s−1. (b) Specific capacitance of α-, β-NiS/CRs composites and bare CRs at various current density. (c) Cycling performance, and (d) Nyquist plots of the EIS of α and β-NiS/CRs composites.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4231331&req=5

f3: Electrochemical properties of α-NiS/CRs, β-NiS/CRs composites and bare CRs.(a) CV curves of α-, β-NiS/CRs composites and bare CRs at 5 mV s−1. (b) Specific capacitance of α-, β-NiS/CRs composites and bare CRs at various current density. (c) Cycling performance, and (d) Nyquist plots of the EIS of α and β-NiS/CRs composites.
Mentions: We speculate that α-NiS/CRs composite could be a good electrode material for charge storage owing to its unique hierarchical structure, conductive nature and high electrochemical performance expected from α-NiS NPs. Fig. 3a shows the cyclic voltammetry (CV) analysis of bare CRs and the two composites in the potential range of 0–0.50 V (vs. standard calomel electrode). α-NiS/CRs shows a much larger CV area than that from β-NiS/CRs and bare CRs, indicating a higher capacitance (also see CV profiles at different scan rates shown in Fig. S4a and S4c). The redox peaks of α-NiS/CRs is originated from the following NiMH battery-like reaction: while the redox peaks of β-NiS/CRs (which disappear after the first cycle) is due to the following irreversible reaction21:

Bottom Line: A facile and phase-controlled synthesis of α-NiS nanoparticles (NPs) embedded in carbon nanorods (CRs) is reported by in-situ sulfurating the preformed Ni/CRs.The nanopore confinement by the carbon matrix is essential for the formation of α-NiS and preventing its transition to β-phase, which is in strong contrast to large aggregated β-NiS particles grown freely without the confinement of CRs.While the high electrochemical stability (approximately 100% retention of specific capacitance after 2000 charge/discharge cycles) is attributed to the supercapacitor-battery electrode, which makes synergistic effect of capacitor (CRs) and battery (NiS NPs) components rather than a merely additive composite.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Flexible Electronics (KLOFE) &Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China.

ABSTRACT
A facile and phase-controlled synthesis of α-NiS nanoparticles (NPs) embedded in carbon nanorods (CRs) is reported by in-situ sulfurating the preformed Ni/CRs. The nanopore confinement by the carbon matrix is essential for the formation of α-NiS and preventing its transition to β-phase, which is in strong contrast to large aggregated β-NiS particles grown freely without the confinement of CRs. When used as electrochemical electrode, the hybrid electrochemical charge storage of the ultrasmall α-NiS nanoparticels dispersed in CRs is benefit for the high capacitor (1092, 946, 835, 740 F g(-1) at current densities of 1, 2, 5, 10 A g(-1), respectively.). While the high electrochemical stability (approximately 100% retention of specific capacitance after 2000 charge/discharge cycles) is attributed to the supercapacitor-battery electrode, which makes synergistic effect of capacitor (CRs) and battery (NiS NPs) components rather than a merely additive composite. This work not only suggests a general approach for phase-controlled synthesis of nickel sulfide but also opens the door to the rational design and fabrication of novel nickel-based/carbon hybrid supercapacitor-battery electrode materials.

No MeSH data available.


Related in: MedlinePlus