Synthesis and characterization of CuS, CuS/graphene oxide nanocomposite for supercapacitor applications

Abstract

Supercapacitors or electrochemical capacitors are receiving greater interest because of their high-power density, long life, and low maintenance. We have synthesized CuS nanoparticles and graphene oxide (CuS–GO) nanocomposites for supercapacitor applications because of their low cost and excellent electrochemical properties. The phase purity of each material was determined using powder XRD studies. The bandgap was determined by UV-visible spectrophotometric studies. Scanning electron microscope and transmission electron microscope images revealed the nano-scale morphology of the synthesized particles. All the electrochemical measurements were conducted in a standard three-electrode configuration, using a platinum wire as the counter electrode and Hg/HgO as the reference electrode. CuS and its composites with graphene oxide on nickel foam were used as working electrodes. All the electrochemical measurements were performed in 3M KOH solution. The CuS–GO nanocomposite electrode showed a specific capacitance of 250 F/g, 225 F/g, 182 F/g, 166 F/g, 161 F/g, and 158 F/g at a current density of 0.5 A/g, 1 A/g, 5 A/g, 10 A/g, 15 A/g, and 20 A/g, respectively. CuS–GO electrodes showed a specific capacitance retention of 70% after 5000 charge–discharge cycles at a current density of 5 A/g.

Synthesis of wool ball‐like copper sulfide nanospheres embedded graphene nanocomposite as electrode for high‐performance symmetric supercapacitor device

“…The high reversibility of the graphene oxide electrode material can be clearly seen from the symmetric charging and discharging curve 37 . Both electrodes CuS nanospheres and CuS/G nanocomposite have small deflection symmetric charging–discharge behavior were observed, suggesting the dual nature of the electrode 38 . The IR drop of the CuS nanospheres and graphene oxide electrodes is higher than that of the CuS/G nanocomposite electrode.…”

“…The CV curve shows nearly rectangular electrodes CuS nanospheres and CuS/G nanocomposite have small deflection symmetric charging-discharge behavior were observed, suggesting the dual nature of the electrode. 38 The IR drop of the CuS nanospheres and graphene oxide electrodes is higher than that of the CuS/G nanocomposite electrode. The composite electrode demonstrates the minimum internal resistance due to the dual nature.…”

“…Due to their semiconducting nature, low cost, and abundance, they can improve the specific capacitance without compromising the power density of the device. Owing to their desirable properties, CuS nanoparticles can be used as buffer layer between the graphene sheets for supercapacitor applications 38 . In energy‐related research, one of the major areas of thrust is to develop energy‐related devices.…”

“…Owing to their desirable properties, CuS nanoparticles can be used as buffer layer between the graphene sheets for supercapacitor applications. 38 In energy-related research, one of the major areas of thrust is to develop energy-related devices. The usefulness and pursuit of these devices hinge on the types of materials employed their physio-chemical properties.…”

Synthesis and enhanced supercapacitor performance of carbon self‐doping graphitic carbon nitride/NiS electrode material

“…In conclusion, the above analysis demonstrates that the combination of TC-g-C 3 N 4 and NiS can improve the electrochemical performance of active electrode materials. Compared with the properties of metal sulfides previously reported (Table 2), [44][45][46][47][48] TC-g-C 3 N 4 /NiS represents idea specific capacitance and cycling performance, which show a good application prospect in supercapacitors.…”