Ultrasonication-mediated nitrogen-doped multiwalled carbon nanotubes involving carboxy methylcellulose composite for solid-state supercapacitor applications

Praveen Kumar Basivi,Arumugam Sivasamy,Heung Soo Kim,Visweswara Rao Pasupuleti,Vijay Kakani,N Afsar,Chinna Bathula,Sivalingam Ramesh,Handol Lee,H M Yadav

doi:10.1038/s41598-021-89430-x

Abstract

In this study, a novel nanohybrid composite containing nitrogen-doped multiwalled carbon nanotubes/carboxymethylcellulose (N-MWCNT/CMC) was synthesized for supercapacitor applications. The synthesized composite materials were subjected to an ultrasonication-mediated solvothermal hydrothermal reaction. The synthesized nanohybrid composite electrode material was characterized using analytical methods to confirm its structure and morphology. The electrochemical properties of the composite electrode were investigated using cyclic voltammetry (CV), galvanic charge–discharge, and electrochemical impedance spectroscopy (EIS) using a 3 M KOH electrolyte. The fabricated composite material exhibited unique electrochemical properties by delivering a maximum specific capacitance of approximately 274 F g−1 at a current density of 2 A g−1. The composite electrode displayed high cycling stability of 96% after 4000 cycles at 2 A g−1, indicating that it is favorable for supercapacitor applications.

Highlights

In this study, a novel nanohybrid composite containing nitrogen-doped multiwalled carbon nanotubes/carboxymethylcellulose (N-MWCNT/CMC) was synthesized for supercapacitor applications
The peak at 1579 cm−1 represents the G peaks of sp[2] carbon atoms, and the D band at 1342 c m−1, which was assigned to the breathing modes of the A1g symmetry[25], represents the local defects and disorder in the N-MWCNT materials
The present work proved that a sonication-assisted hydrothermal process can synthesize an N-MWCNT/CMC composite

Summary

Introduction

A novel nanohybrid composite containing nitrogen-doped multiwalled carbon nanotubes/carboxymethylcellulose (N-MWCNT/CMC) was synthesized for supercapacitor applications. The second mechanism is characterized by (ii) Faradaic capacitors employing metal oxides or conducting polymers that involve electrochemical reactions with excellent specific capacitances and cyclic stabilities[7,8,9]. Kumar et al.[16] created an Fe3O4/RGO nanosheet hybrid electrode for supercapacitor applications This hybrid composite exhibited a capacitance of approximately 455 F g −1 at 8 mV s−1 and excellent cyclic stability. Kalam et al.[18] reported a CNT/PVA gel-based electrode material and showed that at a specific capacitance applied voltage and value of 150 mV s−1 and 219 F g −1, respectively, it had improved electrochemical properties. The porous materials of nitrogen-doped multiwalled carbon nanotubes/carboxymethylcellulose (N-MWCNT/CMC) composites were fabricated using a hydrothermal process for symmetric and asymmetric supercapacitor applications. The composite was confirmed using structural, morphological, and electrochemical applications in the presence of an electrolyte

Methods

Results

Discussion

Conclusion