Ni(OH)2-decorated nitrogen doped MWCNT nanosheets as an efficient electrode for high performance supercapacitors

Sivalingam Ramesh,K Karuppasamy,Hyun-Seok Kim,Heung-Soo Kim,Hemraj M Yadav,Jae-Joon Lee,Joo-Hyung Kim

doi:10.1038/s41598-019-42281-z

Sivalingam Ramesh, K Karuppasamy + Show 5 more

Open Access

https://doi.org/10.1038/s41598-019-42281-z

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Journal: Scientific Reports	Publication Date: Apr 15, 2019
Citations: 49	License type: open-access

Affiliation: Dongguk University

Abstract

In this study, nickel hydroxide nanoparticles (NPs) decorated with nitrogen doped multiwalled carbon nanotubes (N-MWCNT) hybrid composite was synthesized by thermal reduction process in the presence of cetyl ammonium bromide (CTAB) and urea. The as-synthesized Ni(OH)2@N-MWCNT hybrid composite was characterized by FTIR, Raman, XRD, BET, BJH and FE-TEM analyses. These prepared porous carbon hybrid composite materials possessed high specific surface area and sheet like morphology useful for active electrode materials. The maximum specific capacitance of Ni(OH)2@N-MWCNT hybrid nanocomposite in the two electrode system showed 350 Fg−1 at 0.5 A/g,energy density ~43.75 Wkg−1 and corresponds to power density 1500 W kg−1 with excellent capacity retention after 5000 cycles. The results suggest that the prepared two-dimensional hybrid composite is a promising electrode material for electrochemical energy storage applications.

Highlights

Supercapacitors or ultra-capacitors are energy storage devices that have higher power density and better cyclic stability than conventional batteries
The various structural interactions and complexation properties between nitrogen doped multiwalled carbon nanotubes (N-MWCNT) and Ni(OH)[2] of the hybrid composite were analyzed through FTIR spectroscopy
The hybrid composite results further confirmed that (NiOH)[2] bonded to N-doped MWCNT surface in presence of cetyl ammonium bromide (CTAB) surfactant and results compared to previous reports[28,30]

Summary

Introduction

Supercapacitors or ultra-capacitors are energy storage devices that have higher power density and better cyclic stability than conventional batteries. The carbon-based materials such as porous carbon, activated carbon, carbon nanotubes, graphene, and graphene oxide materials are generally used for negative electrodes due to their high surface area and electrostatic charge-storage mechanisms at electrode/electrolyte interfaces. The asymmetric supercapacitors are an effective approach for extending the operating voltage window of the powder sources for supercapacitor and battery applications These supercapacitor generally consists of a battery-type Faradic electrode (used as cathode) as an energy source and a capacitor-type electrode (anode) is a power source. Metal oxide based anodes with nanostructures, such as MnO2, NiO, Co3O4, and Fe2O3, are promising electrode materials for asymmetric supercapacitors because of their high specific capacitance, two or three times higher than that of carbon/graphite-based materials[11]

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