Electrochemical properties of tungsten sulfide-carbon composite microspheres prepared by spray pyrolysis

Seung Ho Choi, Sung Jin Boo, Jong Heun Lee, Yun Chan Kang

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Tungsten sulfide (WS2)-carbon composite powders with superior electrochemical properties are prepared by a two-step process.WO 3-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 bareWO 3 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%.

Original languageEnglish
Article number5755
JournalScientific Reports
Volume4
DOIs
Publication statusPublished - 2014 Aug 29

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Tungsten
Spray pyrolysis
Microspheres
Electrochemical properties
Powders
Composite materials
Carbon
carbon sulfide
Current density

ASJC Scopus subject areas

  • General

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Electrochemical properties of tungsten sulfide-carbon composite microspheres prepared by spray pyrolysis. / Choi, Seung Ho; Boo, Sung Jin; Lee, Jong Heun; Kang, Yun Chan.

In: Scientific Reports, Vol. 4, 5755, 29.08.2014.

Research output: Contribution to journalArticle

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abstract = "Tungsten sulfide (WS2)-carbon composite powders with superior electrochemical properties are prepared by a two-step process.WO 3-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 bareWO 3 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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N2 - Tungsten sulfide (WS2)-carbon composite powders with superior electrochemical properties are prepared by a two-step process.WO 3-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 bareWO 3 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%.

AB - Tungsten sulfide (WS2)-carbon composite powders with superior electrochemical properties are prepared by a two-step process.WO 3-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 bareWO 3 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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