Hydrogenation/Dehydrogenation Performances of the MgH2-WS2 Composites
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2015年第4期
论文作者：王家盛 ZHANG Wei CHENG Ying KE Dandan 韩树民
文章页码：670 - 673
摘 要：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.
王家盛1，ZHANG Wei1，CHENG Ying1，KE Dandan1，韩树民1,2
1. College of Environmental and Chemical Engineering, Yanshan University2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University
摘 要：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.
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