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One-pot hydrothermal synthesis of molybdenum nickel sulfide with graphene quantum dots as a novel conductive additive for enhanced supercapacitive performance

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Abstract

We depict a facile as well as an economical one-step hydrothermal method, for the first time, to synthesize a hierarchical three-dimensional (3D) flower-like structure of molybdenum (Mo) particle decorated nickel sulfide and its composite with graphene quantum dots (GQDs) for high-performance supercapacitor applications. An optimum coupling of GQDs with Mo doped nickel sulfide (MNS-G) enhances the electrical conductivity further by creating more active sites and thus helps in modulating the electrochemical behavior of the composite. The prepared MNS-G-2.5 composite (2.5 wt% GQD) exhibits a superior specific capacitance of 2622 F g−1 at 1 A g−1 and shows an excellent coulombic efficiency of 92.2% after 10 000 cycles at a current density as high as 20 A g−1. The fabricated aqueous-based asymmetric supercapacitor device exhibits an excellent energy density of 38.9 W h kg−1 at a power density of 416.6 W kg−1 with an impressive capacitance retention and coulombic efficiency of 96.4% and 95.9%, respectively, after 10 000 charge–discharge cycles. These outstanding electrochemical properties of GQD- and molybdenum-incorporated nickel sulfide pave the way for the development of efficient electrode materials for practical supercapacitor applications.

Graphical abstract: One-pot hydrothermal synthesis of molybdenum nickel sulfide with graphene quantum dots as a novel conductive additive for enhanced supercapacitive performance

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Supplementary files

Article information


Submitted
11 Aug 2020
Accepted
15 Sep 2020
First published
16 Sep 2020

This article is Open Access

Mater. Adv., 2020, Advance Article
Article type
Paper

One-pot hydrothermal synthesis of molybdenum nickel sulfide with graphene quantum dots as a novel conductive additive for enhanced supercapacitive performance

O. Sangabathula and C. S. Sharma, Mater. Adv., 2020, Advance Article , DOI: 10.1039/D0MA00593B

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