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

Abstract

MoS 2 has attracted a lot of attention for electrochemical energy storage. Herein, we design and fabricate unusual hierarchical composite nanospheres by cultivating a MoS 2 sheet-like nanostructure on nitrogendoped carbon polyhedra (designated as CP@MoS 2 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 MoS 2 nanostructure. The sheet-like MoS 2 nanostructure can render a great deal of storage sites toward lithium and sodium. When measured as a negative electrode for Li storage, these CP@MoS 2 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.

Facile Synthesis of Ultra‐Small Few‐Layer Nanostructured MoSe2 Embedded on N, P Co‐Doped Bio‐Carbon for High‐Performance Half/Full Sodium‐Ion and Potassium‐Ion Batteries

“…In recent years, transitionm etal dichalcogenides (TMDs) have been broadly exploreda sp romisinga node candidates for energy storage devices owing to their admirable rate capability and widespreada vailability. [30][31][32][33][34][35][36][37][38][39][40] Particularly,a sat ypical TMD,m olybdenum diselenide( MoSe 2 )h as al ayered sandwich structure (Se-Mo-Se) with an interlayer distance of 0.65 nm, whichi sn otably larger than that of graphite (0.335nm), and possesses ar elatively high theoretical capacity of 422 mAh g À1 , making MoSe 2 stand out in the vast range of anode materials. [41][42][43][44][45] However,t he weak van der Waals interactionb etween adjacent Se-Mo-Se layers,high surfaceenergy of 2D layers, and inherently low electronic conductivity of bulk MoSe 2 give rise to aggregation of MoSe 2 layers easily and immense volume expansion/contraction, which makes it difficult to function as SIB/PIB electrode materials with satisfactory performance.…”

Carbon-coated Fe2O3 hollow sea urchin nanostructures as high-performance anode materials for lithium-ion battery

“…The O 1s XPS profiles can be fitted with four peaks (Fig. 4c) Promoted by the unique structure of Fe 2 O 3 @MOFC, it is expected that these composites might be an excellent candidate for LIB anode material [36][37][38]. The electrochemical properties of Fe 2 O 3 @MOFC composites, Fe 2 O 3 derived from bare FeOOH and MOFC as anode materials are shown in Fig.…”

Hollow S‐ZIF‐(1:2.5)@NixSy as Highly Efficient Catalyst for 4‐Nitrophenol and Dye Reduction

“…Firstly, the hollow mesoporous structure of the material is more conducive to the transfer of substances during the catalytic process, and a larger specific surface area can lead to the exposure of more active sites, which is conducive to improving the catalytic rate. Secondly, the introduction of S atom increases the adsorption energy of active site on 4‐NP , …”