Electrochemical behavior of MnO2/MWCNT nanocomposites for electrode material in supercapacitor

•Solvothermal synthesis was used to make MnO2/MWCNT nanocomposites.•MnO2/MWCNT nanocomposites were employed as a binder-free super capacitor electrode.•MnO2/MWCNT electrode has a high specific capacitance and a good rate capability.•MnO2/MWCNT electrode annealed at 500 °C has a high specific capacit...

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Bibliographic Details
Published in:Materials letters 2022-05, Vol.314, p.131887, Article 131887
Main Authors: Ramesh Kannan, R., Lenin, N., Aseema Banu, A., Sivabharathy, M.
Format: Article
Language:English
Subjects:
Carbon nanotubes
Electrochemical analysis
Electrode materials
Electrodes
Energy storage
High specific capacitance
Manganese dioxide
Materials science
Nanocomposites
Nanoparticles
Storage capacity
Supercapacitor
Supercapacitors
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Summary:•Solvothermal synthesis was used to make MnO2/MWCNT nanocomposites.•MnO2/MWCNT nanocomposites were employed as a binder-free super capacitor electrode.•MnO2/MWCNT electrode has a high specific capacitance and a good rate capability.•MnO2/MWCNT electrode annealed at 500 °C has a high specific capacitance of 314F/g.•CV curves of the MnO2/MWCNT electrode retain rectangular shape at high scan rates. This study presents the findings of MnO2 tailoring in MWCNT for supercapacitor applications. Using a solvothermal method, we developed the MnO2/MWCNT nanocomposites with high energy storage capacity. The XRD peaks revealed the hexagonal structure of graphite and the tetragonal structure of birnessite type MnO2. TEM revealed that the MWCNT sidewalls were decorated with a huge number of high purity manganese nanoparticles. According to CV studies, the composite electrode's specific capacitance exceeds 314F/g. As per the researchers, the tailored MnO2/MWCNT nanocomposites should promote the best electrode material for supercapacitor applications.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2022.131887