Hydrogenation/dehydrogenation performances of the MgH2-WS2 composites

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• 作者：Jiasheng Wang ; Wei Zhang ; Ying Cheng…
• 关键词：MgH2 ; WS2 ; hydrogen storage composite ; co ; catalytic
• 刊名：Journal of Wuhan University of Technology--Materials Science Edition
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：30
• 期：4
• 页码：670-673
• 全文大小：822 KB
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• 作者单位：Jiasheng Wang (1)
  Wei Zhang (1)
  Ying Cheng (1)
  Dandan Ke (1)
  Shumin Han (1) (2)
  
  1. College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, China
  2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Chinese Library of Science
  
• 出版者：Wuhan University, co-published with Springer
• ISSN：1993-0437

文摘

The hydrogenation/dehydrogenation kinetics and thermodynamic behaviors of the MgH2- WS2 composites were investigated. The TPD (Temperature-Programmed-Desorption) curves showed that the onset dehydrogenation temperature of the MgH2 + 20wt% WS2 composite was 615 K, 58 K lower than that of the pristine MgH2. The kinetic measurements showed that within 21 min, the MgH2 + 20wt% WS2 composite could absorb 2.818wt% at 423 K, and release 4.244 wt% of hydrogen at 623 K, while the hydriding/dehydriding capacity of MgH2 reached only 0.979wt% and 2.319wt% respectively under identical conditions. The improvement of hydrogenation/dehydrogenation performances for the composite was attributed to the cocatalytic effect between the new phases W and MgS which formed during the ball-milling process.