Interfacial Engineering of MoS/VO@C-rGO Composites with Pseudocapacitance-Enhanced Li/Na-Ion Storage Kinetics.

Molybdenum sulfide has been widely investigated as a prospective anode material for Li/Na storage because of its unique layered structure and high theoretical capacity. However, the enormous volume variation and poor conductivity limit the development of molybdenum sulfide. The rational design of a heterogeneous interface is of great importance to improve the structure stability and electrical conductivity of electrode materials. Herein, a high-temperature mixing method is implemented in the hydrothermal process to synthesize the hybrid structure of MoS/VO@carbon-graphene (MoS/VO@C-rGO). The MoS/VO@C-rGO composites exhibit superior Li/Na storage performance due to the construction of the interface between the MoS and VO components and the introduction of carbon materials, delivering a prominent reversible capacity of 564 mAh g at 1 A g after 600 cycles for lithium-ion batteries and 376.3 mAh g at 1 A g after 450 cycles for sodium-ion batteries. Theoretical calculations confirm that the construction of the interface between the MoS and VO components can accelerate the reaction kinetics and enhance the charge-ionic transport of molybdenum sulfide. The results illustrate that interfacial engineering may be an effective guide to obtain high-performance electrode materials for Li/Na storage.