In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 8 ( 2022), p. 4087-4099
Abstract:
Metal selenides have attracted great interest for high-efficiency sodium storage owing to their remarkable advantages of physicochemical features and electrochemical activity. However, substantial issues ( e.g. poor intrinsic conductivity, severe interfacial side reactions and electrode structural destruction) in the electrochemical storage process restrict their practical feasibility and commercial prospects. Herein, a gradient hexagonal-prism configuration was exquisitely designed and developed via in situ conformal growth of double-shell silicon dioxide/carbon (SiO 2 @C) reactors on highly uniform Fe-based MIL-88A nanorods and subsequent selenization–carbonization treatment (Fe 3 Se 4 @SiO 2 @C). In the ingeniously designed Fe 3 Se 4 @SiO 2 @C nanorods, the outer double-shell SiO 2 @C reactors as charge-transfer and deformation-defense layers provide excellent ionic permeability and efficient charge-transfer channels and meanwhile endow superb resistance of volume variation, whereas the inner Fe 3 Se 4 nanorods as a sodium-storage layer feature ample active sites for enhancing reversible capacity and satisfying surface-driven capacitive behaviors. Motivated by its distinctive structure and favorable properties, Fe 3 Se 4 @SiO 2 @C is tremendously conducive to efficient sodium storage, as corroborated by its excellent rate capability and extraordinary stability with an ultrahigh reversible capacity of 272 mA h g −1 at 20.0 A g −1 after 4200 cycles; these results obviously outperform those of the contrast samples Fe 3 Se 4 @SiO 2 and single Fe 3 Se 4 @C as well as other reported Fe-based selenides. The conjunct exploration of ex situ structural characterizations strongly revealed a combination mechanism of intercalation and conversion from Fe 3 Se 4 to the intermediate Na x Fe 3 Se 4 and the final states Na x Se/Fe. More interestingly, a Fe 3 Se 4 @SiO 2 @C//Na 3 V 2 (PO 4 ) 3 @C full cell configuration enables a considerably high capacity of 241 mA h g −1 at 1.0 A g −1 after 100 cycles, revealing great practical feasibility in energy storage systems.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
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