Morphology, structure, and electrochemical properties of the MnOx@CNTs composite: a study of SEM, EDX, XPS, and CVA methods
In this work, we carried out a comprehensive study of the morphology, chemical composition, electronic structure, and electrochemical characteristics of a nanocomposite based on carbon nanotubes (CNTs) and manganese oxide particles. The study of the electronic structure of the nanocomposite, pe...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Omsk State Technical University, Federal State Autonoumos Educational Institution of Higher Education
2022-04-01
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| Series: | Омский научный вестник |
| Subjects: | |
| Online Access: | https://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2022/%E2%84%96%202%20(182)%20(%D0%9E%D0%9D%D0%92)/86-92%20%D0%9A%D0%BE%D1%80%D1%83%D1%81%D0%B5%D0%BD%D0%BA%D0%BE%20%D0%9F.%20%D0%9C.,%20%D0%9D%D0%B5%D1%81%D0%BE%D0%B2%20%D0%A1.%20%D0%9D.,%20%D0%98%D0%B2%D0%BB%D0%B5%D0%B2%20%D0%9A.%20%D0%95..pdf |
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| Summary: | In this work, we carried out a comprehensive study
of the morphology, chemical composition, electronic
structure, and electrochemical characteristics of a
nanocomposite based on carbon nanotubes (CNTs) and
manganese oxide particles. The study of the electronic
structure of the nanocomposite, performed by X-ray
photoelectron spectroscopy (XPS), showed that
manganese is in two chemically nonequivalent states
in MnO2-x and in KMnO4
. It has been established that
manganese oxide is deficient in oxygen. In the course
of electrochemical tests performed by the method
of cyclic voltammetry (CVA), it is shown that the
electrode based on the nanocomposite showed high
arial capacitance values of 320 mF∙cm–2 at a potential
scan rate of 5 mV∙s–1 and a low gravimetric capacitance
of 14 F∙g–1. With an increase in the potential scan
rate, the specific capacitance of the nanocomposite
significantly decreased relative to CNTs, which is due
to a number of reasons: (i) insufficient porosity of the
electrode surface; (ii) a decrease in the amount of MnOx
nanoparticles in the electrode and their dissolution in
the electrolyte during charge-discharge processes. |
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| ISSN: | 1813-8225 2541-7541 |