Heterostructured WS2/MoS2@carbon hollow microspheres anchored on graphene for high-performance Li/Na storage

In this work, the hollow WS2/MoS2@carbon microspheres anchored on graphene were successfully fabricated via the versatile solvothermal and hydrothermal methods. The WS2/MoS2 heterostructure can offer a great charge transport driving force by forming a built-in electric field. Moreover, the incorporation of conductive carbon materials from carbon layer and graphene can mitigate the enormous volume variation and pulverization of electrode materials in the cycle process and ensure fast electronic/ionic transfer kinetics. Thus, the hollow WS2/MoS2@carbon/rGO displays superior rate performance and cycling durability in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). It achieves a excellent capacity of 701.8 mAh g(-1) at 1 A g(-1) after 550 cycles for LIBs. The WS2/MoS2@carbon/rGO composite displays superior rate capability (320.5 mAh g(-1) at 5 A g(-1)) and cycling durability (411.8 mAh g(-1) at 500 mA g-1 after 250 cycles) for SIBs. This work shows a effective strategy for constructing the bimetallic sulfide for energy storage.