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Enhanced Capacitance of Porous Carbon Electrodes through Deposition of Small Amounts of NiO

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Kavaliauskas Z., Marcinauskas L., Valatkevicius P.
Acta Physica Polonica A
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2011
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vol. 120
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issue 1
66-69
EN
Amorphous carbon and NiO/carbon composites were used as an electrode material for supercapacitors. The investigations were performed to evaluate the influence of the Ar/C_2H_2 ratio on the capacitance values of carbon and NiO/carbon electrodes. The surface morphology of the carbon electrodes changes from snowflake-like to columnar with the increase of the Ar/C_2H_2 ratio. The Raman scattering spectroscopy results demonstrated that the I_{D}/I_{G} ratio decreases from 1.33 to 0.91 with the increase of the Ar/C_2H_2 ratio. It indicates the decrease of the sp^2 bonded carbon in the coatings. The specific capacitance of the carbon electrodes increases with the increase of the Ar/C_2H_2 ratio. The NiO/carbon electrodes show capacitance values 10 times larger as those of carbon electrodes. The largest specific capacitance of 27.7 F/g was obtained for NiO/carbon electrode, when carbon coating was deposited under Ar/C_2H_2=27.
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Formation and Characterization of Carbon and Nickel Oxide/Carbon Composites for Supercapacitors

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Kavaliauskas Z., Marcinauskas L., Valatkevicius P.
Acta Physica Polonica A
|
2011
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vol. 119
|
issue 2
253-255
EN
In this study a carbon and NiO/carbon electrodes were prepared and investigated. The surface roughness increases with the increase of the torch power. The addition of the NiO changes the surface structure from a snowflake-like to a mesh-like. It was demonstrated that the addition of the nickel oxide to amorphous carbon increases the specific capacitance of composite electrode. However, the NiO/carbon electrodes have a lower breakdown voltage values and longer charge-discharge cycles.
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