Hierarchical Nanospheres Constructed by Ultrathin MoS₂ Nanosheets Braced on Nitrogen-Doped Carbon Polyhedra for Efficient Lithium and Sodium Storage

Abstract

MoS₂ has attracted a lot of attention for electrochemical energy storage. Herein, we design and fabricate unusual hierarchical composite nanospheres by cultivating a MoS₂ sheet-like nanostructure on nitrogen-doped carbon polyhedra (designated as CP@MoS₂ nanospheres). The nitrogen-doped carbon polyhedra are able to significantly boost the electrical conductivity of the hybrid architecture and largely mitigate the agglomeration of the MoS₂ nanostructure. The sheet-like MoS₂ nanostructure can render a great deal of storage sites toward lithium and sodium. When measured as a negative electrode for Li storage, these CP@MoS₂ nanospheres manifest a large charge capacity of approximately 549 mAh g^-1, a superior cycle life of 900 cycles, and excellent rate property. Furthermore, they also demonstrate improved electrochemical activity for Na⁺ ion storage.