Microwave-irradiated novel mesoporous nickel oxide carbon nanocomposite electrodes for supercapacitor application

T Rakesh Kumar,C H Shilpa Chakra,S Madhuri,E Sai Ram,K Ravi

doi:10.1007/s10854-021-06547-5

Abstract

The present work accentuates the aspects of electrochemical analysis determined by cyclic voltammeter (CV), especially enhancement in supercapacitor's specific capacitance and energy density. In this work, nickel oxide (NiO) and nickel oxide @ reduced graphene oxide (NiO@rGO) nanocomposite materials used as electrodes were synthesized by the microwave irradiation method. Performance of the synthesized material was further characterized using X-ray diffraction, Fourier transform infrared spectroscopy, field-emission scanning electron microscope, Brunauer–Emmett–Teller specific surface-area, thermo gravimetric analysis, and CV. Furthermore, the electrochemical performance of active material at three different molarities (2 M, 4 M and 6 M) of potassium hydroxide as an electrolyte is analyzed, and observed decline in specific capacitance for synthesized nanocomposite materials in a lower state of electrolyte concentration. Accordingly, specific capacitances at 1 A/g are 270 F/g, 395 F/g at 1 A/g current density, and energy densities of 10.2 Wh/kg, 17.55 Wh/kg are observed for NiO and NiO@rGO, respectively, at 6 M KOH.

Highlights

In the present time, sustainable energy storage devices play a vital role in the modern developing society
Weight loss absorbed is due to lattice water molecule evaporation, removal of residual sodium content, and organic matter decomposition. It speculated that nanoparticles calcined above 350oC are due to the Nickel Oxide (NiO)@rGO, and particles calcined above 400 oC may be the mixture of Ni, NiO, and Nickel Oxide @ reduced Graphene Oxide (NiO@rGO) nanocomposite [12]
An increase in the specific surface area from BET for NiO@rGO nanocomposite leads to an enhancement in Electrochemical specific capacitance due to its direct effect on the reaction sites

Summary

Introduction

Sustainable energy storage devices play a vital role in the modern developing society. Nickel Oxide (NiO) and Nickel Oxide @ reduced Graphene Oxide (NiO@rGO) nanocomposite materials using as electrodes synthesized by the Microwave irradiation method. Specific capacitances at 1A/g are 270F/g, 395 F/g at 1A/g current density, and Energy densities of 10.2Wh/Kg, 17.55Wh/Kg are observed for NiO and NiO@rGO respectively at 6M KOH.

Results

Conclusion