Co 3 S 4 -CoS/rGO hybrid nanostructure: promising material for high-performance and high-rate capacity supercapacitor
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ORIGINAL PAPER
Co3S4-CoS/rGO hybrid nanostructure: promising material for high-performance and high-rate capacity supercapacitor S. Nandhini 1 & G. Muralidharan 1 Received: 14 May 2020 / Revised: 12 September 2020 / Accepted: 15 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The task of developing hybrid nanostructured materials to enhance the energy and power density of energy storage devices has assumed greater significance in the past decade. The present research work demonstrates the hydrothermal preparation of graphene-blended Co3S4-CoS nanostructures (CSG) and the fabrication of a symmetric supercapacitor device. The CSG was examined through structural, morphological, surface area and electrochemical characterization. The CSG nanostructures yielded a maximum specific capacitance of 1003 F g−1 at 5 A g−1 with excellent rate capacitance (43%) at 50 A g−1. The CSG nanostructure shows 97% cycling stability over 2600 cycles. The well-blended structure, high conductivity and large surface area of CSG contribute to the best capacitive performance. A CSG-based symmetric supercapacitor device offered a great energy density of 26.7 W h kg−1 at 1 A g−1. The device exhibits good cyclic stability even after 5000 cycles. Three devices connected in series (4.5 V) were charged for 141 s at a current of 10 A could power up red and green LEDs for over 600 s and 480 s, respectively. The obtained electrochemical results and exceptional performance of symmetric devices endorse CSG to be a promising material for energy storage applications. Keywords Graphene . Co3S4-CoS nanoclusters . Supercapacitor . Symmetric device . Energy density
Introduction The rapid rise in the universal energy demand has been driving the search for novel materials and technologies that enable cost-effective, robust and facile design, quick rate of charge/ discharge and high efficiency [1, 2]. Supercapacitors are a significant subdivision of energy-storage devices that have attracted the electrical market owing to their prolonged cycle life, simple operation, lightweight and low electrode resistance [3, 4]. In specific, the combined mechanism (surface adsorption and Faradaic redox reaction) of supercapacitors boost high charge storage with markedly fast charging and
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10008-020-04824-7) contains supplementary material, which is available to authorized users. * G. Muralidharan [email protected] 1
Materials Lab, Department of Physics, The Gandhigram Rural Institute (Deemed to be University), Dindigul, Tamil Nadu 624 302, India
discharging, when we consider regenerative braking in electric automobiles [5]. Metal sulphides are the new age electroactive materials for use in supercapacitors. The electronegativity of sulphur is lesser than oxygen, and hence, metal sulphides exhibit excellent electrochemical response than metal oxides [6, 7]. The rich electrochemistry, high theoretical capacity, structural diversity and multipl
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