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  • Liu, Yang  (2)
  • Ma, Xiaoqing  (2)
  • Sun, Xuping  (2)
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  • 1
    Online Resource
    Online Resource
    Functional integration of hierarchical core–shell architectures via vertically arrayed ultrathin CuSe nanosheets decorated on hollow CuS microcages targeting highly effective sodium-ion storage
    Royal Society of Chemistry (RSC) ; 2021
    In:  Journal of Materials Chemistry A Vol. 9, No. 48 ( 2021), p. 27615-27628
    Details
    In: Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 9, No. 48 ( 2021), p. 27615-27628
    Abstract: Functional integration of metal sulfide@selenide hetero-architectures could give significant superiority on improving sluggish kinetics and optimizing electronic structures. However, the thorough exploration of these architectures for electrochemical features and construction strategies has not attracted sufficient attention so far. Herein, hollow CuS microcubes decorated by using vertically arrayed ultrathin CuSe nanosheets (CuS@CuSe) were synthesized successfully based on a template-directed asynchronous sulfidation/selenization method at room temperature. Driven by all-around achievement in aspects of unique structural engineering and morphological features, CuS@CuSe microcubes enable abundant active storage sites, large volume evolution accommodation space, and short ion diffusion channels, thus resulting in high sodiation capacity, remarkable rate capability and exceptional cycling lifespan with an admirable capacity of 303.1 mA h g −1 at 20.0 A g −1 when galvanically de-/sodiated to the 1500th cycle, superior to its counterparts of single CuS and CuSe, as well as most reported CuS-/CuSe-based anodes when tested as an anode for sodium ion batteries. The in situ XRD and ex situ TEM characterization experiments demonstrate a multiple electronic phase-evolution mechanism involved in the interaction and conversion of the CuS@CuSe electrode. The DFT calculations reval that the excellent performance of CuS@CuSe microcubes stemmed from adequate hetero-interfaces which afford a low Na + adsorption energy and migration energy barrier for ion transport kinetics.
    Type of Medium: Online Resource
    ISSN: 2050-7488 , 2050-7496
    URL: Article
    DOI: 10.1039/D1TA09264B
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2021
    detail.hit.zdb_id: 2702232-8
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  • 2
    Online Resource
    Online Resource
    A gradient hexagonal-prism Fe 3 Se 4 @SiO 2 @C configuration as a highly reversible sodium conversion anode
    Royal Society of Chemistry (RSC) ; 2022
    In:  Journal of Materials Chemistry A Vol. 10, No. 8 ( 2022), p. 4087-4099
    Details
    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
    URL: Article
    DOI: 10.1039/D1TA10571J
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2022
    detail.hit.zdb_id: 2702232-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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