Construction of Desirable NiCoTe 2 Nanosheet Arrays on a Carbon Cloth Substrate as a Positive Electrode Material for a High-Performance Asymmetric Supercapacitor

Nickel–cobalt tellurides are deemed as promising electrode materials for energy storage devices due to their superior conductivity and theoretical specific capacitance. Here, NiCoTe 2 was successfully fabricated on carbon cloth by facile electrodeposition and hydrothermal synthesis, which can directly serve as a binderless electrode. The NiCoTe 2 with interconnected nanosheet arrays on a conductive carbon substrate showed a high specific capacitance (924 F/g at 1 A/g) and robust long-term cycling stability (89.6% retention after 5000 cycles). In addition, the assembled NiCoTe 2 //activiated carbon hybrid supercapacitor achieved a high energy and power density with a short charging time (42.26 Wh/kg at a power density of 760.96 W/kg). This work provides a novel idea to produce bimetallic nickel–cobalt telluride nanosheet array electrodes for high-performance hybrid supercapacitors.