Fullerene-like MoSe2 nanoparticles-embedded CNT balls with excellent structural stability for highly reversible sodium-ion storage.
Fullerene-like MoSe2 nanoparticles-embedded CNT balls with excellent structural stability for highly reversible sodium-ion storage.
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DOI：
10.1039/c5nr07733h
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发表时间：
2016-02
期刊：
影响因子：
6.7
通讯作者：
Seung-Ho Choi;Y. Kang
中科院分区：
文献类型：
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作者：
Seung-Ho Choi;Y. Kang
采用喷雾热分解法和硒化法成功制备了嵌有类富勒烯MoSe 2纳米晶的三维多孔结构碳纳米管球。喷雾热分解制备的MoO 2-CNT复合球通过硒化过程转化为类富勒烯MoSe 2/CNT（F-MoSe 2/CNT）复合球。F-MoSe 2/CNT复合球表现出上级裸MoSe 2和具有填充结构的MoSe 2/CNT（N-MoSe 2/CNT）的钠离子存储性能，两者都被制备为比较样品。裸MoSe 2、N-MoSe 2/CNT复合球和F-MoSe 2/CNT复合球在1.0A g（-1）的高电流密度下的250次放电容量分别为144、200和296 mA h g（-1），并且从第二次循环测量的它们的容量保持率分别为37%、66%和83%。F-MoSe 2/CNT复合球在0.2、0.5、1.5、3.0和5.0 A g（-1）的电流密度下的第10次放电容量分别为382、346、310、280和255 mA h g（-1）。F-MoSe 2/CNT复合球具有良好的钠离子存储性能，这是由于超细尺寸的类富勒烯MoSe 2纳米晶与具有缠结和三维多孔结构的高导电性CNT球的协同作用。
Three-dimensional (3D) porous-structured carbon nanotube (CNT) balls embedded with fullerene-like MoSe2 nanocrystals were successfully prepared by the spray pyrolysis process and subsequent selenization process. The MoO2-CNT composite balls prepared by spray pyrolysis transformed into the fullerene-like MoSe2/CNT (F-MoSe2/CNT) composite balls by the selenization process. The F-MoSe2/CNT composite balls exhibited superior sodium-ion storage properties to bare MoSe2 and MoSe2/CNT with a filled structure (N-MoSe2/CNT), both of which were prepared as comparison samples. The 250(th) discharge capacities of bare MoSe2, N-MoSe2/CNT composite balls, and F-MoSe2/CNT composite balls were 144, 200, and 296 mA h g(-1), respectively, at a high current density of 1.0 A g(-1), and their capacity retentions measured from the second cycle were 37%, 66%, and 83%, respectively. The 10(th) discharge capacities of the F-MoSe2/CNT composite balls were 382, 346, 310, 280, and 255 mA h g(-1) at current densities of 0.2, 0.5, 1.5, 3.0, and 5.0 A g(-1), respectively. The synergetic effect of the fullerene-like MoSe2 nanocrystals with ultrafine sizes and the CNT balls with a tangled and 3D porous structure and high electrical conductivity resulted in excellent sodium-ion storage properties of the F-MoSe2/CNT composite balls.