Single layers of MoS2/Graphene nanosheets embedded in activated carbon nanofibers for high-performance supercapacitor.

Single layered MoS 2 /graphene nanosheets embedded in activated carbon nanofibers (MoS 2 @G/AC) are fabricated through an electrospinning process followed by carbonization and KOH activation. Characterization results demonstrate that the single layers of 2D MoS 2 and graphene nanosheets were dispersed highly uniform in the activated carbon nanofibers which present a diameter approximately 100 nm and a specific surface area of 850.2 m2 g−1. It is found that the dosage of MoS 2 in activated carbon nanofibers affects their electrochemical properties. Thereinto, the 0.5-MoS 2 @G/AC nanofibers as electrode material for supercapacitor show a high specific capacitance of 334 F g−1 and 246.3 F g−1 at a current density of 0.5 A g−1 and 10 A g−1, respectively, in 3 M KOH aqueous electrolyte. The capacitance retention of the 0.5-MoS 2 @G/AC nanofibers is 83.8% after 5000 cycles. Electrochemical tests show good specific capacitance and stability for the MoS 2 @G/AC nanofibers due to the high specific surface area, suitable pore structure, and the synergy between the three different components. • The monolayer 2D MoS 2 nanosheets are embedded in the activated carbon nanofibers. • The synergistic effect of MoS 2 and graphene improved the electrochemical stability. • The KOH activation increase the specific surface area and expose active sites of MoS 2. • The capacitance retention of the 0.5-MoS 2 @G/AC nanofibers is 83.8% after 5000 cycles. [ABSTRACT FROM AUTHOR]