Simultaneously formed and embedding-type ternary MoSe₂/MoO₂/nitrogen-doped carbon for fast and stable Na-ion storage

Abstract

An embedding-type ternary MoSe2/MoO2/carbon nanocomposite is simultaneously synthesized and manifests stable and fast Na-ion storage capability.

3D-engineered WO3 microspheres assembled by 2D nanosheets with superior sodium storage capacity

“…A huge capacity deprivation with an initial coulombic efficiency of 51.8% was observed, due to the formation of a solid electrolyte interphase (SEI) on the surface of the electrode by the decomposition of the electrolyte. 29 The theoretical capacities of carbon materials were less than 250 mA h g −1 . 30 The as-synthesized WO 3 showed a better experimental capacity as compared to carbon materials.…”

In Situ Encapsulation of MoSxSe2–x Nanocrystals with the Synergistic Function of Anion Doping and Physical Confinement with Chemical Bonding for High-Performance Sodium/Potassium-Ion Batteries with Wide Temperature Workability

“…According to the literature, layered transition metal dichalcogenides (TMDs) have large interlayer spacing and high achievable capacity. − Among them, molybdenum diselenide (MoSe 2 ) has larger spacing and a narrower band gap because of its lower activation energy and better electronic conductivity compared to molybdenum sulfide (MoS 2 ). − These advantages are attributed to the special structure of MoSe 2 , whose layers are bound together by weak van der Waals forces, making it easier for Na + to insert between the planes. − However, the presence of low electronic conductivity and volume expansion caused by Na + intercalation/extraction in bulk MoSe 2 disrupts the cycling performance and cycling durability. − Previous studies have been devoted to solving the problems mentioned above, such as Guo et al synthesized MoSe 2 /C with a core/shell architecture and a high stacking density to alleviate volume expansion, reaching 226 mAh g –1 at 1 A g –1 over 1000 cycles . Kang et al used a solvothermal reaction and an annealed process to obtain heterogeneous MoSe 2 /MoO 3 , this heterogeneous nanostructure enhances the electrochemical performance and prevents selenium dissolution, thus improving the insertion–extraction kinetics .…”

Zn–O–C bonds for efficient electron/ion bridging in ZnSe/C composites boosting the sodium-ion storage

“…Additionally, M–O–C bonds can effectively improve ion transfer and limit the “shuttling effect” of poly-sulfide, thereby maintaining the stability of cycling capacity. 29,44–46 Similarly, the formed poly-selenides during electrochemical conversion process could also be anchored by M–O–C bonds by improving electrochemical properties. As far as we know, there are few reports that ZnSe nanoparticles are rivetted in a hierarchical carbon matrix through Zn–O–C bonds to accelerate the electron/ion transfer rate for sodium storage.…”