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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.
2
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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
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2011
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vol. 119
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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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Influence of the Oxygen Plasma Treatment on Carbon Electrode and Capacity of Supercapacitors

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Kavaliauskas Z., Marcinauskas L., Valincius V.
Acta Physica Polonica A
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2014
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vol. 125
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issue 6
1316-1319
EN
Amorphous carbon electrodes were deposited using atmospheric pressure plasma torch from the mixture of argon and acetylene gases on the stainless steel substrates. The ratio of Ar/C_2H_2 was in the range of 15-55. The deposited coatings were immersed in low pressure oxygen plasma for 1 min. Scanning electron microscopy images show that when Ar/C_2H_2 ratio increases from 15 to 55, the electrodes surface roughness decreases. The Raman scattering spectroscopy results indicated that the I_{D}/I_{G} ratio decreases from 2.04 to 1.35. It was observed that with the increase of Ar/C_2H_2 ratio from 15 to 55, the capacity of supercapacitor increases from 16 mF to 36 mF. The electric capacity of capacitors has increased up to 7 times after their exposure in oxygen plasma.
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