Pyrite FeS2 was synthesized through a simple, cost effective solvothermal method. NaOH was used in the synthesis, which plays a crucial role as a pH regulator. The formation of pyrite FeS2 was confirmed through XRD, Raman Spectroscopy and FTIR. SEM results showed the formation of octahedral shaped particles with slight truncated edges. Thermogravimetric Analysis was performed to determine the properties of the material. The electrochemical studies were performed with a three electrode system to explore its supercapacitive behavior using 1 M Na2SO4 and 3.5 M KOH aqueous electrolytes. The electrochemical tests indicated that pyrite FeS2 exhibits a specific capacitance of 260 F/g at 1 A/g with an energy density of 46.8 Wh/kg. The good capacitance and high energy density makes it suitable to be used as an efficient electrode material for supercapacitors. © 2018 Elsevier Ltd

Nirmala Grace A

Centre for Nanotechnology Research

Vellore Campus

Venkateshalu S

Goban Kumar P

Kollu P

Jeong S.K

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

&nbsp;

&nbsp;

VIT University

Electrochimica Acta

A Cobalt disulfide–reduced graphene oxide (CoS2-RGO) nanocomposite was prepared by a simple hydrothermal method and the prepared nanocomposite was characterized using various techniques like XRD, SEM and FTIR. The results of these techniques indicated the uniform deposition of CoS2 nanoparticles on Graphene sheets. Further, the prepared nanocomposites were tested for its activity towards energy storage and the test results showed a specific capacitance of 28[Formula: see text]F/g in an aqueous 20% KOH electrolyte at a current density of 0.5[Formula: see text]A/g. All these materials showed highly reversible charge–discharge cycles. The overall electrochemical performance of this composite is shown to be drastically improved when compared to bare CoS2 nanoparticles. Thus with the good electrochemical properties, CoS2–RGO nanocomposites could be effectively used as an electrode material for supercapacitors.

International Journal of Nanoscience

Hydrothermal Synthesis and Electrochemical Properties of CoS2–Reduced Graphene Oxide Nanocomposite for Supercapacitor Application

Zinc sulfide decorated graphene nanocomposites are synthesized by a facile solvothermal approach and the prepared composites are analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), High Resolution Transmission electron microscopy (HRTEM), Fourier transform infrared (FTIR), Ultraviolet visible spectroscopy (UV), Photoluminescence spectroscopy (PL) and Raman spectrum. Results show the effective reduction of graphene oxide (GO) to graphene and decoration of ZnS nanoparticles on graphene sheets. Towards supercapacitor applications, the electrochemical measurements of different electrodes are performed in 6 M KOH electrolyte. A series of composites with different loadings of graphene is synthesized and tested for its electrochemical properties. The specific capacitance of the electrodes are evaluated from cyclic voltammetry (CV) studies and a maximum specific capacitance of 197.1 F/g is achieved in ZnS/G-60 electrode (60 indicates the weight ratio of GO) at scan rate of 5 mV s-1. A capacitance retention of about 94.1% is observed even after 1000 cycles for ZnS/G-60 electrode, suggesting the long time cyclic stability of the composite electrode. Galvanostatic charge-discharge curves show the highly reversible process of ZnS/G-60 electrode. Electrochemical Impedance Spectrum (EIS) shows a high conductivity of composite electrode suggesting that the composites are good candidates for energy storage. © 2015 Elsevier Ltd.

Solvothermal synthesis of Zinc sulfide decorated Graphene (ZnS/G) nanocomposites for novel Supercapacitor electrodes

Advanced Energy Materials

FeS2 Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High-Performance Electrocatalysts

Ruthenium sulfide nanoparticles as a new pseudocapacitive material for supercapacitor

J. Mater. Chem. A

Binder-free WS2 nanosheets with enhanced crystallinity as a stable negative electrode for flexible asymmetric supercapacitors

Solvothermal synthesis and electrochemical properties of phase pure pyrite FeS2 for supercapacitor applications

Journal	Data powered by TypesetElectrochimica Acta
Publisher	Data powered by TypesetElsevier BV
ISSN	0013-4686
Open Access	0