NiSe₂/MoSe₂ Electrode Materials for High-Performance Electrochemical Capacitors

Abstract

Supercapacitors have gained interest as innovative sustainable energy storage systems owing to their high specific capacitance and superior cycle stabilities. However, their large-scale applications are limited by their poor electron conductivity and low energy density. Herein, we prepare a NiSe 2 /MoSe 2 composite on nickel foam via a two-step hydrothermal route, which delivers a specific capacity of 736 C g −1 at 1 A g −1 . Meanwhile, it achieves a retention rate of 92.87% at 5 A g −1 after cycling 10,000 times. Furthermore, the assembled asymmetric device offers an energy density of 59.25 Wh kg −1 at a power density of 2700 W kg −1 . Also, the devices maintain excellent mechanical stability and durability after multiple bending.