New symmetric and asymmetric supercapacitors based on high surface area porous nickel and activated carbon

Ganesh, V.; Pitchumani, S.; Lakshminarayanan, V.

doi:10.1016/j.jpowsour.2005.10.090

Cited by 290 publications

(162 citation statements)

References 36 publications

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“…2c) was significantly longer (B80 ms), which can be explained by an increased equivalent series resistance (ESR). This increased ESR is mostly due to an increased equivalent distributed resistance, which relates to the diffusion of ions within the porous electrode 30 (Fig. 2d).…”

Section: Resultsmentioning

confidence: 99%

Ultrafast charge and discharge biscrolled yarn supercapacitors for textiles and microdevices

et al. 2013

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Flexible, wearable, implantable and easily reconfigurable supercapacitors delivering high energy and power densities are needed for electronic devices. Here we demonstrate weavable, sewable, knottable and braidable yarns that function as high performance electrodes of redox supercapacitors. A novel technology, gradient biscrolling, provides fastion-transport yarn in which hundreds of layers of conducting-polymer-infiltrated carbon nanotube sheet are scrolled into B20 mm diameter yarn. Plying the biscrolled yarn with a metal wire current collector increases power generation capabilities. The volumetric capacitance is high (up to B179 F cm À 3 ) and the discharge current of the plied yarn supercapacitor linearly increases with voltage scan rate up to B80 Vs À 1 and B20 Vs À 1 for liquid and solid electrolytes, respectively. The exceptionally high energy and power densities for the complete supercapacitor, and high cycle life that little depends on winding or sewing (92%, 99% after 10,000 cycles, respectively) are important for the applications in electronic textiles.

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Section: Resultsmentioning

confidence: 99%

Ultrafast charge and discharge biscrolled yarn supercapacitors for textiles and microdevices

et al. 2013

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“…If n=0, the CPE behaves as a pure resistor; n = 1, CPE behaves as a pure capacitor, n = −1 CPE behaves as an inductor; while n = 0.5 corresponds to Warburg impedance (Z w ) which is associated with the domain of mass transport control arising from the diffusion of ions to and from the electrode|solution interface. Generally speaking, CPE has been known to occur via several factors notably (i) the nature of the electrode (e.g., roughness and polycrystallinity), (ii) distribution of the relaxation times due to heterogeneities existing at the electrode|electrolyte interface, (iii) porosity and (iv) dynamic disorder associated with diffusion [64]. Thus, the n values in Table 1 of approximately 0.6 may be interpreted as a near-Warburg system involving the diffusion of ions to and from the electrode|solution interface.…”

Section: Comparative Electron Transport Propertiesmentioning

confidence: 99%

Probing the electrochemical behaviour of SWCNT–cobalt nanoparticles and their electrocatalytic activities towards the detection of nitrite at acidic and physiological pH conditions

Adekunle

Pillay

Ozoemena

2010

Electrochimica Acta

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a b s t r a c tThe electrochemical decoration of edge plane pyrolytic graphite electrode (EPPGE) with cobalt and cobalt oxide nanoparticles integrated with and without single-walled carbon nanotubes (SWCNTs) is described. Successful modification of the electrodes was confirmed by field emission scanning electron microscopy (FESEM), AFM and EDX techniques. The electron transfer behaviour of the modified electrodes was investigated in [Fe(CN)6] 3−/4− redox probe using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) and discussed. The study showed that cobalt nanoparticles modified electrodes exhibit faster electron transfer behaviour than their oxides. The catalytic rate constant (K) obtained at the EPPGE-SWCNT-Co for nitrite at pH 7.4 and 3.0 are approximately the same (∼3 × 10 4 cm 3 mol −1 s −1 ) while the limits of detection (LoD = 3.3ı/m) are in the M order. From the adsorption stripping voltammetry, the electrochemical adsorption equilibrium constantˇwas estimated as (13.0 ± 0.1) × 10 3 M −1 at pH 7.4 and (56.7 ± 0.1) × 10 3 M −1 at pH 3.0 while the free energy change ( G • ) due to the adsorption was estimated as −6.36 and −10.00 kJ mol −1 for nitrite at pH 7.4 and 3.0, respectively.

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“…The relaxation time constant (τ 0 ) calculated from the plot of the real capacitance C' (ω) vs. frequency is found to be 0.8 s. The τ 0 is a very important factor, which decides the applicability of the electrode material according to the energy demand. A smaller relaxation time constant exhibits a faster energy release capability for an electrode, and provides a higher power density [40].…”

Section: Resultsmentioning

confidence: 99%

Growth of polyaniline nanofibers for supercapacitor applications using successive ionic layer adsorption and reaction (SILAR) method

Deshmukh

Pusawale

Shinde

et al. 2014

Journal of the Korean Physical Society

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We report the synthesis of polyaniline nanofibers using the successive ionic layer adsorption and reaction (SILAR) method. The structural study shows the amorphous nature of polyaniline. The formation of polyaniline nanofibers has been revealed by scanning electron microscopy (SEM) whereas the confirmation of polyaniline material is obtained from Fourier transform infrared (FT-IR) spectroscopy. A plausible explanation illustrating the growth mechanism is presented. A maximum specific capacitance of 1078 F.g −1 at a scan rate of 5 mV.s −1 is obtained. The charge-discharge behavior shows a maximum specific power of 1.2 kW.kg −1 and specific energy of 64 Wh.kg −1 . The ease of the synthesis and the interesting electrochemical properties indicate that polyaniline nanofibers are promising materials for supercapacitor applications.

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New symmetric and asymmetric supercapacitors based on high surface area porous nickel and activated carbon

Cited by 290 publications

References 36 publications

Ultrafast charge and discharge biscrolled yarn supercapacitors for textiles and microdevices

Ultrafast charge and discharge biscrolled yarn supercapacitors for textiles and microdevices

Probing the electrochemical behaviour of SWCNT–cobalt nanoparticles and their electrocatalytic activities towards the detection of nitrite at acidic and physiological pH conditions

Growth of polyaniline nanofibers for supercapacitor applications using successive ionic layer adsorption and reaction (SILAR) method

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