Porous nickel oxide nano-sheets for high performance pseudocapacitance materials

Sun, Xiang; Wang, Gongkai; Hwang, Jiann‐Yang; Lian, Jie

doi:10.1039/c1jm12734a

Cited by 156 publications

(103 citation statements)

References 61 publications

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“…25 Moreover, a growing selection of layered oxides and hydroxides are showing great promise in this area. 3,[26][27][28][29][30][31][32][33][34][35] To best employ the high intrinsic pseudocapacitance of any material requires the maximum number of redox active sites be in contact with the electrolyte and therefore available for charge storage. This makes the layered oxides described above extremely attractive so long as they can be exfoliated into thin flakes.…”

mentioning

confidence: 99%

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

et al. 2014

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Here we demonstrate significant improvements in the performance of supercapacitor electrodes based on 2D MnO2 nano-platelets by the addition of carbon nanotubes. Electrodes based on MnO2 nano-platelets do not display high areal capacitance because the electrical properties of such films are poor, limiting the transport of charge between redox sites and the external circuit.In addition, the mechanical strength is low, limiting the achievable electrode thickness, even in the presence of binders. By adding carbon nanotubes to the MnO2-based electrodes, we have increased the conductivity by up to eight orders of magnitude, in line with percolation theory.The nanotube network facilitates charge transport, resulting in large increases in capacitance, especially at high rates, around 1 V/s. The increase in MnO2 specific capacitance scaled with nanotube content in a manner fully consistent with percolation theory. Importantly, the mechanical robustness was significantly enhanced, allowing the fabrication of electrodes that were 10 times thicker than could be achieved in MnO2-only films. This resulted in composite films with areal capacitances up to 40 times higher than could be achieved with MnO2-only electrodes.

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mentioning

confidence: 99%

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

et al. 2014

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“…The specific capacitance (C s ) of the samples was obtained from the integrated area of CV curves by using the following equation [30]:…”

Section: Resultsmentioning

confidence: 99%

One-pot synthesis of graphene/glucose/nickel oxide composite for the supercapacitor application

Tran

Jeong

2015

Electrochimica Acta

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“…A similar trend has been reported in NiO nanowire systems previously. [56][57][58][59] As the frequency increases, the more inclined features for the spectra are observed; this could be due to the more pronounced surface redox reactions at the electrode-electrolyte interface, which involve the exchange of OH À in both cases.…”

Section: Role Of Carbon In Cycle Stability and Charge-transfer Resistmentioning

confidence: 94%

Camphoric Carbon‐Grafted Ni/NiO Nanowire Electrodes for High‐Performance Energy‐Storage Systems

Paravannoor¹,

Nair²,

Ranjusha³

et al. 2013

ChemPlusChem

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The present study provides the first report on the preparation and utilization of camphoric carbon nanobeads grafted onto Ni/NiO nanowires for rechargeable electrodes for energy‐storage applications. These functionally graded nanowires were electrophoretically deposited onto nickel foils and processed into high‐surface‐area electrodes. A detailed study has been performed to elucidate the effect of carbon content, different electrolytes, and their concentrations on these nanowires. BET surface area analysis revealed that these grafted nanowires could exhibit a high surface area of about 106 m2 g−1, compared with pristine nanowires, which exhibited a surface area of about 45 m2 g−1. From the analysis of relevant electrochemical parameters, an intrinsic correlation between the capacitance, internal resistance, and the surface morphology has been deduced. Relative contributions of capacitive and diffusion‐controlled processes underlying these thin‐film electrodes have been mathematically modeled. These thin‐film electrodes exhibited specific mass capacitance values as high as (1950±80) and (1140±60) F g−1, as determined from cyclic voltammetry and charge discharge curves, respectively; these values were 30–50 % higher than that of a pristine nanowire electrode. Furthermore, a working model button cell employing these rechargeable electrodes is also described, which exhibited energy and power densities of 83 and 75 Wh kg−1, respectively. This study shows that electrodes based on such nanowire/carbon nanobead configurations can allow significant room for improvement in energy density, power density, and cyclic stability of supercapacitor/battery systems.

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Porous nickel oxide nano-sheets for high performance pseudocapacitance materials

Cited by 156 publications

References 61 publications

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

Effect of Percolation on the Capacitance of Supercapacitor Electrodes Prepared from Composites of Manganese Dioxide Nanoplatelets and Carbon Nanotubes

One-pot synthesis of graphene/glucose/nickel oxide composite for the supercapacitor application

Camphoric Carbon‐Grafted Ni/NiO Nanowire Electrodes for High‐Performance Energy‐Storage Systems

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