Constructing MoO₂@MoS₂ heterostructures anchored on graphene nanosheets as a high-performance anode for sodium ion batteries

Heterostructures have gained intensive attentions in various energy storage fields due to their diverse physicochemical properties and functions, originating from the synergistic effects and interfacial interaction between the different components. However, it is still a great challenge to employ simple methods to design an advanced heterostructure for superior sodium storage performances. Herein, a facile in situ localized phase transformation strategy has been developed to transfer MoO₃ nanoparticles anchored on rGO nanosheets into MoO₂@MoS₂ heterostructures (MoO₂@MoS₂/rGO). Benefiting from faster ion transport at the heterogeneous interface, higher conductivity as well as more active sites for Na storage than that of single component, MoO₂@MoS₂/rGO electrode exhibits distinguished reversible capacity (604.1 mAh g⁻¹ at 0.1 A g⁻¹) and remarkable rate performance (420.8 mAh g⁻¹ at 5.0 A g⁻¹) when evaluated as an anode for SIBs. This work provides a simple and feasible method for constructing stable heterostructures for high-performance energy storage materials.