Nanostructured Composites MWCNT/transition metal oxide obtained by thermal decomposition of hydroxides
T. A. LARICHEV1, YU. A. ZAKHAROV2, N. M. FEDOROVA1, G. Yu. SIMENYUK2, V. M. PUGACHEV1, YU. V. LOKTIONOV1, V. E. NIKIFOROV1
1Kemerovo State University, Kemerovo, Russia
2Federal Research Center of Coal and Coal Chemistry, Siberian Branch of the Russian Academy of Sciences, Kemerovo, Russia
Keywords: zinc cobaltate, cobalt oxides, cobalt hydroxide, zinc hydroxide, carbon nanotubes, nanocomposites
Pages: 548-559
Abstract
The structural, morphological and electrochemical properties of nanocomposite materials obtained by thermal decomposition of cobalt hydroxides and mixed cobalt-zinc hydroxides on the surface of a carbon matrix formed by multi-walled carbon nanotubes (MWCNT) were investigated. The interaction of the solutions of cobalt and zinc sulphates with sodium hydroxide results in the formation of the solid phase which includes cobalt hydroxide and zinc oxide. Subsequent thermal treatment in the air leads mainly to the formation of zinc cobaltate Zn x Co(1 - x )O y , in which the relative content of cobalt and zinc can vary within a broad range. The electrochemical properties of synthesized nanocomposite materials were investigated by cyclic voltammetry. Investigation of the electrochemical properties of the synthesized nanocomposite materials by means of cyclic voltammetry showed that the introduction of cobalt oxide into carbon matrix causes an increase in electrical capacitance within the whole range of potential scanning rates (10-80 mV/s). Application of electrode materials based on the carbon/zinc cobaltate composite for manufacture allows an increase in specific capacitance of supercapacitors by a factor of 1.5 and saves cobalt, a material in short supply.
DOI: 10.15372/CSD2020264
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