Application of MnO2/MWCNT composite in supercapacitors

Supercapacitors have attracted tremendous attention due to high power density, high rate capability, long cycling life and safety. The article presents the comparison of electrochemical performance of multi-walled carbon nanotubes (MWCNTs), MnO2 and MnO2/MWCNT nanocomposite as electrode mass in supercapacitor. Materials were characterized by X-ray diffraction, scanning electron microscopy, low temperature nitrogen adsorption and cyclic voltammetry. The specific capacitance was found to increase in the row MWCNTs < MnO2 < MnO2/MWCNT achieving 32, 90 and 140 F . g(-1) at 5 mV . s(-1), respectively. The outstanding improvement of specific capacitance for MnO2/MWCNT was attributed to the combination of high electrical conductivity of carbon nanotubes enhancing the charge transport and faradic redox reactions occurring on MnO2 surface. Copyright (C) 2022 Elsevier Ltd. All rights reserved.

Automated summary

This article compares the electrochemical performance of multi-walled carbon nanotubes (MWCNTs), MnO2, and MnO2/MWCNT nanocomposite as electrode mass in supercapacitors, and finds that MnO2/MWCNT exhibits the highest specific capacitance.