Investigation and fabrication of asymmetrical supercapacitor using nanostructured Mn3O4 immobilized carbon nanotube composite

• Published in: Superlattices and microstructures Vol. 138; p. 106380
• Main Authors: Ranjithkumar, R., Arasi, S. Ezhil, Nallamuthu, N., Devendran, P., Lakshmanan, P., Arivarasan, A., Kumar, M. Krishna
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2020
• Subjects: Carbon nanotube; Cyclic voltammetry; Energy storage devices; Mn3O4–fCNT composites; Supercapacitor; ZnO-CNT; Carbon nanotube; Cyclic voltammetry; Supercapacitor; Mn3O4–fCNT composites; ZnO-CNT; Energy storage devices
• ISSN: 0749-6036; 1096-3677
• DOI: 10.1016/j.spmi.2019.106380

The manganese oxide (Mn3O4) nanoparticles (NPs) were immobilized in the surface of functionalized carbon nanotubes (fCNT) (Mn3O4–fCNT composite) for the enhancement of electrochemical performances. The broad and notable crystalline peaks were found in a powder X-ray diffraction pattern of Mn3O4–fCNT and it confirms that, Mn3O4 presence in nanoscale. The functional vibrations of –OH, –COOH, CO, C–O were found in FTIR spectrum and Raman spectra also recorded to understand functional groups present in the composite. The surface morphology was studied and also, the elemental analysis was carried out for Mn3O4–fCNT using SEM images of the composite. The electrochemistry responses of Mn3O4–fCNT were investigated. We have evaluated its response and performances in cyclic voltammetry, impedance, galvanostatic charge-discharge aspects. A notable specific capacitance of 499 Fg-1 at 0.1 mAg−1 was found in Mn3O4-fCNT. The asymmetrical supercapacitor was designed with Mn3O4–fCNT and ZnO-CNT and its specific capacitance was evaluated. Design of Mn3O4–CNT and ZnO–CNT asymmetrical supercapacitor and its cyclic voltammetry curves. [Display omitted] •Mn3O4−fCNT/ZnO-CNT composite based asymmetrical supercapacitor was fabricated.•Mn3O4−fCNT composite exhibits the specific capacitance about 499 F/g.•Power density of 4500 W/kg was found for Mn3O4−fCNT nanocomposite.•¾ times of specific capacitance retention after 1000 cycles was found.•Power density of 2200 W/kg aas found for asymmetrical supercapacitor.