Sandwich Structures Constructed by ZnSe⊂N‐C@MoSe2 Located in Graphene for Efficient Sodium Storage

Hybrid hierarchical micro/nanostructures possess great potential in engineering of advanced electrode materials for sodium‐ion batteries (SIBs). Herein, a sandwich hierarchical architecture composed of ZnSe nanoparticles fastened in N‐doped carbon polyhedra anchoring onto graphene with the modification of MoSe2 nanosheets (ZnSe⊂N‐C@MoSe2/rGO) is synthesized by a self‐template and subsequent selenization strategy. Due to the distinctive architectural and multicompositional features, these hybrids deliver a high reversible capacity of 319.4 mAh g−1 at 1 A g−1 for 1800 cycles, 206.5 mA h g−1 at 6 A g−1 for 2800 cycles, and 177.7 mAh g−1 at 10 A g−1 for 5000 cycles, as well as a better rate capability up to 10 A g−1 with a reversible capacity of 224.4 mAh g−1 as an anode material for SIBs. By comparing the capacity contribution, electrochemical impedance spectra and DNa+ of different materials, the advantages of ZnSe⊂N‐C@MoSe2/rGO are confirmed. The sodium storage mechanism of hybrids is further revealed by in situ X‐ray diffraction patterns and high‐resolution transmission electron microscopy results. The improved sodium storage properties of hybrids manifest the significance of elaborate construction of novel multicomponent hierarchical architectures with higher complexity. A novel sandwich hierarchical architecture, composed of ZnSe nanoparticles fastened N‐doped carbon polyhedral framework encapsulated MoSe2 and MoSe2 nanosheets colocated in reduced graphene oxides (ZnSe⊂N‐C@MoSe/rGO, ZMSG), is synthesized via a self‐template strategy, indicating excellent sodium‐storage performance due to the unique the structural and compositional features.