Two-dimensional MoS2 reinforced with Cu3N nanoflakes prepared via binder less sputtering route for flexible supercapacitor electrodes

Here, we present a binder less sputtering approach for controllable growth of copper nitride (Cu3N) nanoflakes incorporated into 2D layered molybdenum disulfide (MoS2) nanoworms directly grown on flexible stainless steel (SS) substrate. The formation of the intermixed nanostructure is revealed by surface morphology. Moreover, the porous structure and good conductivity, and the presence of sulfur and N-2 edges facilitate the synergistic effect favor more pathways for insertion and desertion of electrolyte ions (Na+). The optimized composite electrode achieves an outstanding specific capacitance (215.47 F/g at 0.5 A/g) along with remarkable elongated cycle life (similar to 90% retention over 2000 cycles at 9.5 A/g). Additionally, the electrode (of dimensions 3 x 1 cm(2)) shows high energy density (similar to 30 Wh/kg at a power density of 138 W/kg), extended potential window (1 V), fair mechanical stability, and pliability (retains similar to 91% specific capacitance at 175 degrees bending angle). The contemporary method provides a cathode material for practically applicable supercapacitors with superior flexibility and desirable electrochemical properties.

Automated summary

A novel binder less sputtering method is introduced for the growth of copper nitride nanoflakes incorporated into a composite electrode on flexible stainless steel substrate, resulting in outstanding electrochemical properties.