Nanostructured Composites Based on Highly Porous Carbon Matrixes Filled with Cobalt and Nickel Hydroxides
YU.A. ZAKHAROV1,2, E.V. KACHINA1, N.M. FEDOROVA2, T.A. LARICHEV2, G.YU. SIMENYUK1, V.M. PUGACHEV2, and V. G. DODONOV2
1Institute of Coal Chemistry and Material Sciences of Federal Research Centre of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia
E-mail: zaharov@kemsu.ru
2Kemerovo State University, Kemerovo, Russia
Keywords: cobalt hydroxide, nickel hydroxide, carbon matrix, nanostructured composite, carbon nanotubes, electrode materials
Abstract
The paper considers properties of nanostructured composites for supercapacitors electrodes. The materials are based on multi-walled carbon nanotubes obtained by pyrolysis of the propane-butane mixture (CNT-1) and additionally aged in argon atmosphere (CNT-2). The resulting CNT are filled with cobalt and nickel hydroxides nanoparticles deposited on the surface and in channels composing nanotube fibres. The composites were explored through transmission electron microscopy, X-ray diffractometry, X-ray Fluorescence Element Analysis, and Small-Angle X-ray Scattering. Electrochemical properties of the resulting nanocomposites were examined. As shown, both introducing cobalt-nickel hydroxide into the carbon matrix and functionalizing its surface by ozonation facilitates an increase in the electrical capacity of composite electrodes. This is driven by the pseudocapacitance of nickel-cobalt hydroxides generated as a consequence of reversible redox processes with the involvement of oxyhydroxide phases formed upon cell charge-discharge.
DOI: 10.15372/CSD20180609
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