Porous NiCo₂S₄ Networks as Electrodes for Electrochemical Supercapacitors

Abstract

Porous NiCo 2 S 4 networks have been successfully synthesized by a facile one-pot solvothermal method without the use of any surfactant or template. Crystal structure, morphology, composition and surface area of the as-synthesized samples were characterized by X-ray di®raction, eld-emission scanning electron microscopy, X-ray photoelectron spectroscopy and BrunauerEmmet-Teller techniques. Owing to their porous nature and small crystalline size, the as-prepared NiCo 2 S 4 networks based supercapacitor electrodes showed a high speci¯c capacitance of 1250 FÁg À1 at 1 AÁg À1 , and excellent cycling stability with the retention capacity of 70.3% after 5000 cycles in the KOH aqueous solution electrolyte.

Selenization of NiCo2S4 Spinel Structure to Reduce the Charge Transfer Resistance for Supercapacitor Electrode

“…For the asymmetric devices, the window voltage was first optimized with the CV curves under the 1.4–1.8 V at the scan rates of 50 mV s −1 . As shown in Figure 6 a, the figure that certain deformation occurred in the CV curve when the voltage window was greater than 1.6 V. [ 41,42 ] This is due to the irreversible redox reaction of the device at higher voltages. So the safe voltage window is 0–1.6 V. Figure 6b shows the CV curve of Se‐NiCo 2 S 4 ‐10//AC at a scanning rate of 5–100 mV s −1 under the voltage window of 0–1.6 V. The good symmetry of the graph shows that the stability of charge and discharge of Se‐NiCo 2 S 4 ‐10//AC is good.…”

A Facile One-Pot Method for Co3O4/Graphene Composite as Efficient Electrode Materials for Supercapacitors

“…[1][2][3][4] At present, various kinds of electrode materials have been developed, such as carbon material, 5 metal oxide, 6 conducting polymers and composites. 7,8 It has been proved that Co 3 O 4 /graphene composites have dramatic performance as electrode material.…”