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Mesoporous 3D network Ce doped NiO nanoflakes as high performance electrodes for supercapacitor applications

Abstract

In the present work, pristine NiO and Ce (0.5, 1.0, 1.5 and 2 %) doped NiO nanoflakes was synthesised using the sol-gel method for supercapacitor applications. All the samples were characterized by Powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman analysis. In situ chemical species and oxidation state of the elements present on the surface of the compounds are revealed by X-ray photoelectron spectroscopy. The field emission scanning electron microscopic analysis (FESEM) explored the transformation in morphology from pristine NiO nanosheets to 3D flower-like nanostructure of Ce doped NiO nanoflakes. Further, BET analysis revealed that surface area of NiO nanoflakes increased with Ce dopant concentration. Ce-1% flower-like nanostructure showed the larger surface area of 226.6 m2/g with an average pore volume of 1.41 cm3/g. As expected, among the five electrodes Ce-1% exhibited the maximum surface redox activity and offered a high specific capacitance of 2444 F/g at 5 mV/s scan rate which is triple the times of pure NiO nanosheets. The charge-discharge analysis resulted in a maximum specific capacitance of 1725 F/g at 1 A/g current density for Ce-1% doped NiO nanoflakes. Electrochemical impedance spectra showed a very low resistance of 1.5 Ω for Ce-1% doped NiO.

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Publication details

The article was received on 07 Jan 2019, accepted on 03 Apr 2019 and first published on 04 Apr 2019


Article type: Paper
DOI: 10.1039/C9NJ00097F
Citation: New J. Chem., 2019, Accepted Manuscript

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    Mesoporous 3D network Ce doped NiO nanoflakes as high performance electrodes for supercapacitor applications

    S. PE and S. Selladurai, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ00097F

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