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

• Solvothermal synthesis was used to make MnO 2 /MWCNT nanocomposites. • MnO 2 /MWCNT nanocomposites were employed as a binder-free super capacitor electrode. • MnO 2 /MWCNT electrode has a high specific capacitance and a good rate capability. • MnO 2 /MWCNT electrode annealed at 500 °C has a high specific capacitance of 314F/g. • CV curves of the MnO 2 /MWCNT electrode retain rectangular shape at high scan rates. This study presents the findings of MnO 2 tailoring in MWCNT for supercapacitor applications. Using a solvothermal method, we developed the MnO 2 /MWCNT nanocomposites with high energy storage capacity. The XRD peaks revealed the hexagonal structure of graphite and the tetragonal structure of birnessite type MnO 2. 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 MnO 2 /MWCNT nanocomposites should promote the best electrode material for supercapacitor applications. [ABSTRACT FROM AUTHOR]