Facile synthesis of novel CuCo₂S₄ nanospheres for coaxial fiber supercapacitors

Abstract

A flexible coaxial supercapacitor was designed using CuCo2S4 nanospheres on Ti wire, which exhibit satisfactory performances with high capacitance, excellent cycle stability and high energy density.

Nanoporous CuCo2S4 Microspheres: A Novel Positive Electrode for High-Performance Hybrid Energy Storage Devices

“…The GCD curves for the CCS electrode measured at different current densities ranging from 2 to 20 A g –1 are illustrated in Figure c. Consistent with the CV results, the nonlinear shape in the GCD curves relates to the Faradaic redox reactions of Co 4+ /Co 3+ and Cu 2+ /Cu + couples . The small iR drop, which is even observed at ultrahigh currents, indicates an excellent rate capability and a high conductivity for electrode .…”

“…In the Cu 2p spectrum, the two peaks at 931.62 and 951.63 eV (with a splitting of 20 eV), assigned to Cu 2p 3/2 and Cu 2p 1/2 , are characteristic peaks of Cu + . In the S 2p spectrum, the S 2p 3/2 and S 2p 1/2 peaks appeared at the binding energy of 161.7 and 162.4 eV, respectively, and they are demonstrating the typical presence of S 2– . , …”

“…In the S 2p spectrum, the S 2p 3/2 and S 2p 1/2 peaks appeared at the binding energy of 161.7 and 162.4 eV, respectively, and they are demonstrating the typical presence of S 2− . 30,31 The specific surface area of the CCS sample and its pore size distribution were measured using BET and BJH methods, respectively. The N 2 adsorption/desorption isotherm of the CCS sample presented the hysteresis loop of type IV, verifying its mesoporous structure, as shown in Figure 1c.…”

Preparation of cobalt sulfide@reduced graphene oxide nanocomposites with outstanding electrochemical behavior for lithium-ion batteries

“…40 The binding energy at 780.6 and 796.3 eV are consistent with Co 2p 3/2 and 2p 1/2 with the splitting value over 15 eV demonstrating the coexistence of Co 3+ and Co 2+ . 41,42 The higher state of Co 3+ would provide extra capacity for LIBs. 43 The S 2p spectrum as shown in Fig.…”

Enhanced electrochemical performance of CuCo2S4/carbon nanotubes composite as electrode material for supercapacitors

“…This value is much higher than that of the CuCo2S4//AC device (e.g., 73.5%). It is also higher than those of previous reported CuCo2S4 based ASC devices in literature [61][62][63], indicating the excellent cyclic stability of the CuCo2S4/CNTs-3.2%//AC device due to the addition of CNTs. Fig.…”