Superior supercapacitive performance of molybdenum sulfide/reduced graphene oxide composite

Hydrothermal strategy was used to grow molybdenum sulfide (MoS2) micro flower-like structures reinforced reduced graphene oxide (rGO) for supercapacitor (SC) application. Morphological and structural analyses confirmed the well-distribution of MoS2 on rGO sheets. Despite using lithium sulfate (Li2SO4) as a relatively high-voltage window electrolyte, potassium iodide (KI) was incorporated for sturdy iodide/iodine redox interaction. Thus, the fabricated symmetric SCs result achieved superior power density (P-d) of similar to 36 kW/kg and exceptionally high energy density (E-d) of 132.9 Wh/kg at 10 and 0.1 A/g, respectively. The maximum estimated specific capacitance (C-s) was 357 F/g for optimum KI ratio. Additionally, SC possesses more than 99 % of retention value after applying 8000 cycles at 10 A/g. These findings implies MoS2/rGO composite and Li2SO4/KI mixed electrolyte configuration as a simple but efficient SC configuration for high energy, power and lifetime.

Automated summary

In this study, a hydrothermal strategy was used to grow molybdenum sulfide micro flower-like structures on reduced graphene oxide sheets. By incorporating potassium iodide into the electrolyte, the fabricated supercapacitors achieved high power density, energy density, and cycle stability.