Morphology and electrochemical properties of composites based on multi-wall carbon nanotubes filled with gold and manganese oxides nanoparticles

Y.A. Zakharov, N.V. Ivanova ORCID logo , G.Y. Simenyuk, M.V. Lomakin, T.O. Sergina, E.V. Kachina, V.G. Dodonov ORCID logo показать трудоустройства и электронную почту
Получена 17 октября 2023; Принята 03 декабря 2023;
Эта работа написана на английском языке
Цитирование: Y.A. Zakharov, N.V. Ivanova, G.Y. Simenyuk, M.V. Lomakin, T.O. Sergina, E.V. Kachina, V.G. Dodonov. Morphology and electrochemical properties of composites based on multi-wall carbon nanotubes filled with gold and manganese oxides nanoparticles. Письма о материалах. 2023. Т.13. №4s. С.481-487
BibTex   https://doi.org/10.22226/2410-3535-2023-4-481-487

Аннотация

Morphological (SAXS) and electrochemical (CV, EIS) properties of nanostructured composites Au/MWCNT and MnxOy/MWCNT prepared by means of multiple layer-by-layer auto-reduction (HAuCl4 or KMnO4) were investigated, nanoparticles of fillers are formed in both channels and on external surface of the MWCNT. The maximum effect of increase in electric capacitance of the composites with 4 wt % Au and 5 wt.% MnxOy with respect to capacitance of MWCNT is 1.2 and 2.9, respectively, in the region of the low scan rates.The morphology and electrochemical characteristics of multi-wall carbon nanotubes (MWCNT)-based nanostructured composites filled with Au or MnxOy nanoparticles have been studied. It is determined that during the both nanocomposites types preparation by the reduction of aqueous HAuCl4, KMnO4 solutions, fillers nanoparticles formed in MWCNTs channels or on its external surface. The maximum electric capacitances of the nanostructured composites with optimal filler content are in 1.3 times (for the 4 wt.%Au composites) and 2.9 times (for the 5 wt.% MnxOy composites) more than initial MWCNT capacitance. The nature of anodic and cathodic peaks determining the pseudocapacitance on cyclic voltammetry curves for the composites filled with MnxOy and corresponding to transformations in Mn oxides has been defined. Electrochemical impedance spectra for the nanocomposites reflect the occurrence of these reactions, as well as Red-Ox processes with the participation of functional groups on the C-matrixes surface, in addition to the formation of an electric double layer. Electrochemical properties of MWCNTs and nanocomposite electrodes are described with proposed equivalent scheme with the satisfactory accuracy in the frequency range of 0.1 Hz – 100 kHz.

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Финансирование на английском языке

1. Ministry of Education and Science of the Russian Federation - 121031500211-9
2. Russian Science Foundation - 23-13-00356