MoS2 Nanosheets on Nickel Foams with Cobalt Doping and Plasma Treatment for Supercapacitors

Abstract

The development of supercapacitors has garnered considerable attention due to their high power density, rapid charge–discharge capabilities, and long cycle life. Molybdenum disulfide (MoS₂) is a promising candidate for supercapacitor electrode material because of its excellent electrical conductivity and large surface area. The study investigates the enhancement of MoS₂ supercapacitor performance through the dual effects of Co doping and plasma treatment. Co doping introduces additional charge carriers and modifies the electronic structure of MoS₂, which can improve the electrochemical performance by enhancing the conductivity and increasing the number of active sites for charge storage. Moreover, the plasma treatment process helps to create surface defects that can further boost the electrochemical reactivity of the material. The synergistic effect of these two strategies is expected to optimize the overall performance. As a result, PT-MoS₂@Co displays a high specific capacitance of 182 F/g at 1 A g^–1 and an excellent cycling stability of 96.2% after 10,000 cycles. Furthermore, the flexible symmetric supercapacitors assembled by PT-MoS₂@Co on carbon cloths show high power and energy density. This work introduces a method that integrates chemical doping with physical plasma treatment to improve the electrochemical performance of MoS₂.