Boosting sodium-ion storage performance of MoSe2@C electrospinning nanofibers by embedding graphene nanosheets

In this work, a facile strategy for embedding graphene (GR) nanosheets into carbon-coated MoSe 2 (MoSe 2 @C@GR) hybrid nanofibers has been developed by a simple electrospinning route. One dimensional nanofibers have excellent structural stability resulting from strong tolerance to stress change. The highly conductive graphene nanosheets play an excellent coating effect on MoSe 2 to inhibit the growth of MoSe 2 nanosheets on the nanofiber surface and enhance the conductivity of hybrid nanofibers, which substantially improves the rate performance and cycle stability of carbon-coated MoSe 2 (MoSe 2 @C) nanofibers. In particular, the MoSe 2 @C@GR electrode delivers a high discharge capacity of 366.9 mAh g −1 after 200 cycles at 0.2 A g −1 , meanwhile exhibits superior rate performance. The analysis of Nyquist plots reveals that the addition of graphene nanosheets can greatly strengthen the kinetics of electrode reaction and the electrochemical activity.