Nanoarchitectonics of Three-Dimensional Carbon Nanofiber-Supported Hollow Copper Sulfide Spheres for Asymmetric Supercapacitor Applications

Abstract

Three-dimensional carbon nanofiber (3D-CNF)-supported hollow copper sulfide (HCuS) spheres were synthesized by the facile hydrothermal method. The morphology of the as-synthesized HCuS@3D-CNF composite clearly revealed that the 3D-CNFs act as a basement for HCuS spheres. The electrochemical performance of as-synthesized HCuS@3D-CNFs was evaluated by cyclic voltammetry (CV) tests, gravimetric charge–discharge (GCD) tests, and Nyquist plots. The obtained results revealed that the HCuS@3D-CNFs exhibited greater areal capacitance (4.6 F/cm2) compared to bare HCuS (0.64 F/cm2) at a current density of 2 mA/cm2. Furthermore, HCuS@3D-CNFs retained excellent cyclic stability of 83.2% after 5000 cycles. The assembled asymmetric device (HCuS@3D-CNFs//BAC) exhibits an energy density of 0.15 mWh/cm2 with a working potential window of 1.5 V in KOH electrolyte. The obtained results demonstrate that HZnS@3D-CNF nanoarchitectonics is a potential electrode material for supercapacitor applications.

Application of Copper–Sulfur Compound Electrode Materials in Supercapacitors

“…In addition, alkaline electrolyte conditions are commonly used in copper-sulfur SC compounds. Shah et al tested the CV curves of CuS at different scanning rates (10-80 mV s −1 ) under the potential window range of −0.1 to 0.7 V. Figure 4c shows a pair of redox peaks produced by Cu 2+ and Cu + with the potential of 0.5 V. As depicted, CuS has Faraday pseudocapacitance in a KOH electrolyte, and the corresponding electrode pseudocapacitance corresponds to Equations ( 4)- (7) [25][26][27][28][29][30][31]:…”

Nonwoven Electrospun Membranes as Tissue Scaffolds: Practices, Problems, and Future Directions

“…Factors such as drying conditions, heat treatment, and hot-pressing techniques greatly influence the final characteristics of the nanofiber membrane. It is crucial to consider all these parameters adequately in order to achieve optimized conditions for the formation of nanofiber membranes [81,82]. By controlling various parameter conditions, it is possible to produce different structures, morphologies, sizes, and functionalities of membrane fibres, as described in Table 1.…”