One‐Step Hydrothermal Synthesis of Carbon‐Coated Nickel–Copper Sulfide Nanoparticles for High‐Performance Asymmetric Supercapacitors

Abstract

The C@Ni0.9Cu0.1‐S supercapacitor electrode material with good electrochemical performance was successfully prepared by a simple hydrothermal method. C@Ni0.9Cu0.1‐S obtained by adding glucose has better electrochemical performance than single Ni0.9Cu0.1‐S. In this work, the electrochemical properties of C@Ni0.9Cu0.1‐S electrode materials and asymmetric supercapacitors were studied in detail. This single‐electrode specific capacity in the 6 M KOH solution reaches 1986 F g–1 and the potential window is 0 to 0.49 V. In order to increase the energy density and potential window of the supercapacitor, C@Ni0.9Cu0.1‐S is used as a positive electrode, and AC is used as a negative electrode to assemble asymmetric supercapacitors. The results show that the working voltage of C@Ni0.9Cu0.1‐S∥ AC asymmetric supercapacitor increases to 1.6 V, and the specific capacitance and energy density can reach 184.4 F g–1 and 65.6 Wh kg–1, respectively, and has excellent cycling stability. These excellent electrochemical properties indicate that C@Ni0.9Cu0.1‐S is a promising supercapacitor electrode material.

A Review of Supercapacitors: Materials Design, Modification, and Applications

“…Similarly, CoS/NF, CuS/NF, FeS/NF, and NiS/NF [135], CoMoO 4 [136]. NiMnO 3 [137], Co@NiSe 2 [138], C@Ni 0.9 Cu 0.1-S [139], α-MnO 2 , β-MnO 2 and Mn 3 O 4 [140], CuCo 2 S 4 [141], Ni 3 S 2 /MoS 2 [142], Cu-MnS with PVP [143] etc., were also successfully synthesized for a supercapacitor as electrode materials by measn of the hydrothermal method. The developed hydrothermal process showed promising effects for the synthesis of Cu-MnS with PVP nanocomposite for a high-performance supercapacitor.…”