Low dimensional systems

The effect of heat treatment on the structure and electrochemical characteristics of composite based on multi-walled carbon nanotubes and manganese oxide

S. N. Nesov^ab, Yu. A. Sten'kin^b, P. M. Korusenko^ac, V. V. Bolotov^ab, S. A. Matyushenko<sup>ab

a</sup> Omsk State Technical University, Omsk, Russia
^b Omsk Scientific Center, Siberian Branch of the Russian Academy of Sciences, Omsk, Russia
^c Saint Petersburg State University, St. Petersburg, Russia

Abstract: In this paper, the effect of heat treatment in an inert medium on the structure and electrochemical characteristics of a composite based on multi-walled carbon nanotubes (MWCNTs) and manganese oxide formed by deposition from a KMnO$_4$ solution is investigated. As a result of heat treatment composite (500$^\circ$C) in argon on the surface of multi-walled carbon nanotubes are formed nanoparticles of non-stoichiometric manganese oxide. X-ray photoelectron spectroscopy data indicate a high degree of functionalization of the surface of carbon nanotubes by oxygen-containing groups, as well as the possible formation chemical bonds at the interfaces of the composite. Electrochemical measurements showed that the specific capacity of the composite after heat treatment ($\sim$ 88–50 F/g) exceeds the capacity of the original MWCNTs (18–15 F/g) in the current range discharge 0.1–1 A/g.

Keywords: supercapacitors, 1D-structure, hydrothermal decomposition, charge-discharge characteristics.

DOI: 10.21883/FTT.2023.08.56166.135

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