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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Sodium-ion storage performance of hierarchically structured (Co1/3Fe2/3)Se-2 nanofibers with fiber-in-tube nanostructures
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Sodium-ion storage performance of hierarchically structured (Co1/3Fe2/3)Se-2 nanofibers with fiber-in-tube nanostructures

机译：管内纤维纳米结构的分层结构（Co1 / 3Fe2 / 3）Se-2纳米纤维的钠离子存储性能

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Nanostructured multicomponent metal selenide materials and their carbon composite materials have been studied as anode materials for sodium-ion batteries (SIBs). Hierarchically structured (Co1/3Fe2/3)Se-2 nanofibers with fiber-in-tube nanostructures and (Co1/3Fe2/3)Se-2-C composite nanofibers with filled structures were prepared by electrospinning with subsequent selenization. Selenization of the CoFe2O4 nanofibers formed rod-type (Co1/3Fe2/3)Se-2 nanocrystals, and the tube-in-tube nanostructures of the nanofibers transformed into fiber-in-tube structures during this process. The discharge capacities of the hierarchically structured (Co1/3Fe2/3)Se-2 nanofibers and (Co1/3Fe2/3)Se-2-Se-C composite nanofibers were 594 and 512 mA h g(-1) (for the 60th cycle at a current density of 0.3 A g(-1)), respectively, and their corresponding capacity retentions measured from the 2nd cycle were almost 100%. The reversible discharge capacity of the hierarchically structured (Co1/3Fe2/3)Se-2 nanofibers decreased slightly from 585 to 497 mA h g(-1) as the current density was increased from 0.1 to 5.0 A g(-1). However, the reversible discharge capacity of the (Co1/3Fe2/3)Se-2-Se-C composite nanofibers decreased from 543 to 359 mA h g(-1) as the current density was increased from 0.1 to 5.0 A g(-1). The uniquely structured (Co1/3Fe2/3)Se-2 nanofibers with fiber-in-tube structures and featuring highly crystallized ultrafine nanorods (which have high electrical conductivity) showed superior rate performance compared to the (Co1/3Fe2/3)Se-2-Se-C composite nanofibers with filled structures.
机译：已经研究了纳米结构的多组分金属硒化物材料及其碳复合材料作为钠离子电池（SIB）的负极材料。通过电纺丝和随后的硒化制备具有管状纤维纳米结构的分层结构（Co1 / 3Fe2 / 3）Se-2纳米纤维和具有填充结构的（Co1 / 3Fe2 / 3）Se-2-C复合纳米纤维。 CoFe2O4纳米纤维的硒化形成棒状（Co1 / 3Fe2 / 3）Se-2纳米晶体，在此过程中，纳米纤维的管中管纳米结构转变为管中结构。分层结构的（Co1 / 3Fe2 / 3）Se-2纳米纤维和（Co1 / 3Fe2 / 3）Se-2-Se-C复合纳米纤维的放电容量为594和512 mA hg（-1）（第60个循环在电流密度分别为0.3 A g（-1）的情况下，从第二个周期开始测量的相应容量保持率几乎为100％。随着电流密度从0.1 A g（-1）增加，分层结构的（Co1 / 3Fe2 / 3）Se-2纳米纤维的可逆放电容量从585毫安时降至497 mA h g（-1）。然而，随着电流密度从0.1 A g（-1）增加到（Co1 / 3Fe2 / 3）Se-2-Se-C复合纳米纤维的可逆放电容量从543降至359 mA hg（-1） ）。具有独特结构的（Co1 / 3Fe2 / 3）Se-2纳米纤维具有管中纤维结构，并具有高度结晶的超细纳米棒（具有高电导率），与（Co1 / 3Fe2 / 3）Se-具有填充结构的2-Se-C复合纳米纤维。

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