Journal
MATERIALS ADVANCES
Volume 1, Issue 8, Pages 2763-2772Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ma00593b
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- Ministry of Human Resources Development and Department of Heavy Industries, Govt. of India under the IMPRINT scheme [7035]
- Department of Science and Technology under the DST-FIST program [SR/FST/ETI-421/201]
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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 10000 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 10000 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.
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