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

Z. Kavaliauskasa, b, L. Marcinauskasa, c and P. Valatkeviciusa aLithuanian Energy Institute, Breslaujos 3, LT-4440, Kaunas, Lithuania bKaunas University of Applied Sciences, Pramonės 20, LT-50468, Kaunas, Lithuania cKaunas University of Technology, Studentu 50, LT-51368, Kaunas, Lithuania

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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/C2H2 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/C2H2 ratio. The Raman scattering spectroscopy results demonstrated that the ID/IG ratio decreases from 1.33 to 0.91 with the increase of the Ar/C2H2 ratio. It indicates the decrease of the sp2 bonded carbon in the coatings. The specific capacitance of the carbon electrodes increases with the increase of the Ar/C2H2 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/C2H2=27.

DOI: 10.12693/APhysPolA.120.66 PACS numbers: 81.15.-z, 81.05.U-, 82.47.Uv, 68.55.J-