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- W3201993715 abstract "Abstract NiS 1.23 Se 0.77 nanosheets closely attached to the internal surface of hollow mesoporous carbon sphere (HMCS) to form a NiS 1.23 Se 0.77 nanosheets embedded in HMCS (NSSNs@HMCS) composite as the anode of sodium ion batteries (SIBs) is reported by a facile synthesis route. The anode exhibits a superior reversible capacity (520 mAh g −1 at 0.1 A g −1 ) , impressive coulombic efficiency (CE) of up to 95.3%, a high rate capacity (353 mAh g −1 at 5.0 A g −1 ), excellent capacity retention at high current density (95.6%), and high initial coulombic efficiency (ICE) (95.1%). Firstly, the highest ICE for NiS 2 /NiSe 2 ‐based anode can be ascribed to ultrathin layered structure of NiS 1.23 Se 0.77 nanosheet and highly efficient electron transfer between the active material and HMCS. Secondly, the optimized NiS 2 /NiSe 2 heterostructure at the nanoscale of the inside HMCS is formed after the first discharge/charge cycles, which can provide rich heterojunction interfaces/boundaries of sulfide/selenides to offer faster Na + pathways, decrease the Na + diffusion barriers, increase electronic conductivity, and limit the dissolution of polysulfides or polyselenides in the electrolyte. Finally, the hollow structure of the HMCS accommodates the volume expansion, prevents the pulverization and aggregation issues of composite materials, which can also promote outstanding electrochemical performance." @default.
- W3201993715 created "2021-10-11" @default.
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- W3201993715 date "2021-10-07" @default.
- W3201993715 modified "2023-10-16" @default.
- W3201993715 title "Enhancing the Electrochemical Performance of Sodium‐Ion Batteries by Building Optimized NiS<sub>2</sub>/NiSe<sub>2</sub> Heterostructures" @default.
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- W3201993715 doi "https://doi.org/10.1002/smll.202104186" @default.
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