H2O2-assisted microwave synthesis of NiO/CNT nanocomposite material for supercapacitor applications

Sannasi, Veeman; Maheswari, K. Uma; Karthikeyan, C.; Karuppuchamy, S.

doi:10.1007/s11581-020-03563-z

Cited by 42 publications

(13 citation statements)

References 71 publications

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“…At higher scan rate, the electroactive materials exhibit higher ionic transport can also be inferred from the above characteristics. The indicated i-v response is based on the capacitance and that is mainly due to the redox reaction of modified electrodes [31][32][33][34][35]. This result further confirms the conductivity based on high performance capacitance at Zn-embedded Ni 9 S 8 nanosphere modified electrode.…”

Section: Capacitive Characteristicssupporting

confidence: 61%

High performing Zn-embedded Ni9S8 nanosphere electrodes for Pseudo-supercapacitors

Dhilipkumar¹,

Jeganathan

Joseph³

et al. 2021

J Mater Sci: Mater Electron

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Highly electroactive Zn-embedded Ni 9 S 8 nanosphere and its ZnS/Ni x S 6 -based nanocomposites were prepared by a simple hydrothermal route. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transformed infrared spectra (FTIR), high-resolution scanning electron microscope (HR-SEM), transmission electron microscope (TEM), energy-dispersive X-ray spectral (EDX) techniques. The XRD analysis revealed the formation of orthorhombic phase of Zn-embedded Ni 9 S 8 nanosphere for hydrothermally treated sample. The supercapacitance behavior of crystalline Zn-embedded Ni 9 S 8 nanosphere and ZnS/Ni x S 6 nanocomposite modified electrodes were investigated using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) techniques. Zn-embedded Ni 9 S 8 nanosphere prepared by hydrothermal route achieved highest specific capacitance value of 145 F/g in 1 A/g compared to the calcined sample modified electrodes. The maximum capacity retention of 100, 96 and 90% at 2000 cycles @1 A/g were observed for the pristine Zn-Ni 9 S 8 and calcined Zn-Ni 9 S 8 at 200 and 300 °C, respectively.

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Section: Capacitive Characteristicssupporting

confidence: 61%

High performing Zn-embedded Ni9S8 nanosphere electrodes for Pseudo-supercapacitors

Dhilipkumar¹,

Jeganathan

Joseph³

et al. 2021

J Mater Sci: Mater Electron

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“…All Nyquist plots show an incomplete semicircle in higher frequency region (inset) related to charge transfer and polarization resistance (RCT) where smaller diameters correspond to faster kinetics representing a faster transport process. The equivalent series resistance (Rs) as a combination of the current collector resistance, ionic resistance of the electrolyte, and the electrode/electrolyte interfacial resistance can be calculated from the high-frequency intercept of EIS spectra to the real axis [63,65] whereas, the nearly vertical line in low-frequency region (absence of semicircle) depicting Warburg like behaviour signifies mainly capacitive behaviour with low ion diffusion resistance within highly porous media [66,67].…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…faster kinetics representing a faster transport process. The equivalent series resistance (Rs) as a combination of the current collector resistance, ionic resistance of the electrolyte, and the electrode/electrolyte interfacial resistance can be calculated from the high-frequency intercept of EIS spectra to the real axis [63,65] whereas, the nearly vertical line in low-frequency region (absence of semicircle) depicting Warburg like behaviour signifies mainly capacitive behaviour with low ion diffusion resistance within highly porous media [66,67]. The resistive behaviour of the cell was further investigated in detail by fitting the experimental impedance data with the depicted equivalent circuit model given as an inset in Figure 14 for the quantitative analysis of the EIS spectra using "Zview" software.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Pseudocapacitive Effect of Carbons Doped with Different Functional Groups as Electrode Materials for Electrochemical Capacitors

et al. 2020

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In this study, RF-based un-doped and nitrogen-doped aerogels were produced by polymerisation reaction between resorcinol and formaldehyde with sodium carbonate as catalyst and melamine as the nitrogen source. Carbon/activated carbon aerogels were obtained by carbonisation of the gels under inert atmosphere (Ar) followed by activation of the carbons under CO2 at 800 °C. The BET analysis of the samples showed a more than two-fold increase in the specific Surf. area and pore volume of carbon from 537 to 1333 m2g−1 and 0.242 to 0.671 cm3g−1 respectively after nitrogen doping and activation. SEM and XRD analysis of the samples revealed highly porous amorphous nanostructures with denser inter-particle cross-linked pathways for the activated nitrogen-doped carbon. The X-Ray Photoelectron Spectroscopy (XPS) results confirmed the presence of nitrogen and oxygen heteroatoms on the Surf. and within the carbon matrix where improvement in wettability with the drop in the contact angle from 123° to 80° was witnessed after oxygen and nitrogen doping. A steady drop in the equivalent series (RS) and charge transfer (RCT) resistances was observed by electrochemical measurements after the introduction of nitrogen and oxygen heteroatoms. The highest specific capacitance of 289 Fg−1 with the lowest values of 0.11 Ω and 0.02 Ω for RS and RCT was achieved for nitrogen and oxygen dual-doped activated carbon in line with its improved Surf. chemistry and wettability, and its enhanced conductivity due to denser inter-particle cross-linked pathways.

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“…In the Table S1 demonstrated a comparation of the electrochemical performance of the obtained NiO/C (60 wt% NiO) and other NiO/C composites with different carbon supports (composite microspheres [ 30 ], hollow microspheres [ 31 ], CNTs [ 32 ], carbon coating on the NiO [ 33 ], graphite [ 34 ], sulfonated graphene [ 35 ], carbon nanospheres [ 36 ]), prepared by various methods [ 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. One can see that the C s of the NiO/C (60 wt% NiO) at the current density of 1 A g −1 is 405 Fg −1 ( Figure 6 c, Table S1 ) which is nearly the same [ 35 , 36 ] or much higher than C s [ 30 , 31 , 32 , 33 , 34 ] of other materials.…”

Section: Resultsmentioning

confidence: 99%

Non-Isothermal Decomposition as Efficient and Simple Synthesis Method of NiO/C Nanoparticles for Asymmetric Supercapacitors

et al. 2021

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A series of NiO/C nanocomposites with NiO concentrations ranging from 10 to 90 wt% was synthesized using a simple and efficient two-step method based on non-isothermal decomposition of Nickel(II) bis(acetylacetonate). X-ray diffraction (XRD) measurements of these NiO/C nanocomposites demonstrate the presence of β-NiO. NiO/C nanocomposites are composed of spherical particles distributed over the carbon support surface. The average diameter of nickel oxide spheres increases with the NiO content and are estimated as 36, 50 and 205 nm for nanocomposites with 10, 50 and 80 wt% NiO concentrations, respectively. In turn, each NiO sphere contains several nickel oxide nanoparticles, whose average sizes are 7–8 nm. According to the tests performed using a three-electrode cell, specific capacitance (SC) of NiO/C nanocomposites increases from 200 to 400 F/g as the NiO content achieves a maximum of 60 wt% concentration, after which the SC decreases. The study of the NiO/C composite showing the highest SC in three- and two-electrode cells reveals that its SC remains almost unchanged while increasing the current density, and the sample demonstrates excellent cycling stability properties. Finally, NiO/C (60% NiO) composites are shown to be promising materials for charging quartz clocks with a power rating of 1.5 V (30 min).

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H2O2-assisted microwave synthesis of NiO/CNT nanocomposite material for supercapacitor applications

Cited by 42 publications

References 71 publications

High performing Zn-embedded Ni9S8 nanosphere electrodes for Pseudo-supercapacitors

High performing Zn-embedded Ni9S8 nanosphere electrodes for Pseudo-supercapacitors

Pseudocapacitive Effect of Carbons Doped with Different Functional Groups as Electrode Materials for Electrochemical Capacitors

Non-Isothermal Decomposition as Efficient and Simple Synthesis Method of NiO/C Nanoparticles for Asymmetric Supercapacitors

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