Yolk-Shell-Structured Nanospheres with Goat Pupil-Like S-Doped SnSe Yolk and Hollow Carbon-Shell Configuration as Anode Material for Sodium-Ion Storage
- Authors
- Park, Gi Dae; Kang, Yun Chan
- Issue Date
- 6월-2021
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- S-doped metal selenide; carbon nanocomposites; heterostructures; sodium-ion batteries; yolk-shell structure
- Citation
- SMALL METHODS, v.5, no.6
- Indexed
- SCIE
SCOPUS
- Journal Title
- SMALL METHODS
- Volume
- 5
- Number
- 6
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/127918
- DOI
- 10.1002/smtd.202100302
- ISSN
- 2366-9608
- Abstract
- Rationally nanostructured electrode materials exhibit excellent sodium-ion storage performance. In particular, yolk-shell configurations of metal chalcogenide@void@C are introduced in various synthetic strategies for use as superior anode materials. Herein, yolk-shell-structured nanospheres, with goat pupil-like configuration of S-doped SnSe yolks and hollow carbon shells, are synthesized by salt-infiltration and a simple post-treatment procedure. Impressively, the co-infiltration of thiourea and selenium oxide enables the doping of sulfur into SnSe (SnSeS) and carbon shells, as well as the formation of a goat pupil-like yolk-shell architecture. High-reactivity thiourea-derived H2S gas forms nanocrystals inside the carbon nanospheres. The nanocrystals act as seeds for the crystal growth of SnSeS through Ostwald ripening. The unique yolk-shell structure and composition with a heterointerface provide not only structural stability but also fast electrode reaction kinetics during repeated cycling. The SnSeS@C electrode shows an excellent cycle life (186 mA h g(-1) for 1000 cycles at 0.5 A g(-1)) and rate capability (112 mA h g(-1) at 5.0 A g(-1)).
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