硫化
复合数
材料科学
碳纤维
热解
钨
硫化物
法拉第效率
无定形碳
电化学
热分解法
化学工程
无定形固体
复合材料
冶金
硫黄
电极
纳米技术
化学
有机化学
物理化学
工程类
薄膜
作者
Seung Ho Choi,Sung Jin Boo,Jong Heun Lee,Yun Chan Kang
摘要
Tungsten sulfide (WS2)–carbon composite powders with superior electrochemical properties are prepared by a two-step process. WO3-carbon composite powders were first prepared by conventional spray pyrolysis and they were then sulfidated to form WS2-carbon powders. Bare WS2 powders are also prepared by sulfidation of bare WO3 powders obtained by spray pyrolysis. Stacked graphitic layers could not be found in the bare WS2 and WS2–carbon composite powders. The amorphous bare WS2 and WS2–carbon composite powders have Brunauer–Emmett–Teller (BET) surface areas of 2.8 and 4 m2 g−1, respectively. The initial discharge and charge capacities of the WS2–carbon composite powders at a current density of 100 mA g−1 are 1055 and 714 mA h g−1, respectively and the corresponding initial Coulombic efficiency is 68%. On the other hand, the initial discharge and charge capacities of the bare WS2 powders are 514 and 346 mA h g−1, respectively. The discharge capacities of the WS2–carbon composite powders for the 2nd and 50th cycles are 716 and 555 mA h g−1, respectively and the corresponding capacity retention measured after first cycle is 78%.
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