材料科学
阳极
化学工程
硫脲
奥斯特瓦尔德成熟
纳米晶
纳米技术
电极
化学
有机化学
物理化学
工程类
作者
Gi Dae Park,Yun Chan Kang
标识
DOI:10.1002/smtd.202100302
摘要
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 H2 S 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 ).
科研通智能强力驱动
Strongly Powered by AbleSci AI