二维层状材料（WS2和MoS2）的催化action对MgH2的吸氢性能的影响
Catalytic action of two-dimensional layered materials (WS2, and MoS2) on hydrogen sorption properties of MgH2
摘要：
本研究报告的二维（2D）层状材料（二硫化钼和WS 2）的催化作用，以改善脱氢/再氢化的MgH 2的动力学。在WS_2催化剂存在下，MgH_2在277 ℃开始脱附，储氢量为5.95wt%，而在MoS_2催化下，MgH_2的开始脱附温度为330 ℃。MgH 2-WS 2在300 ℃下在13个大气压的氢压力下在1.3分钟内吸收约3.72重量%的氢，并且在300 ℃下在1个大气压的氢压力下在20分钟内解吸约5.57重量%。我们已经进行了25个循环的脱氢（在300 ℃下在1atm氢气压力下）和再氢化（在300 ℃下在13 atm氢气压力下）以确保催化形式的MgH 2的循环稳定性，其中MgH 2-WS 2显示出比MgH 2-MoS 2更好的循环稳定性。MgH 2-WS 2也显示出较低的反应活化能~117 kJ/mol，与其他催化和未催化的样品相比。另一方面，这些催化剂（WS 2和MoS 2）对热力学参数即焓变化没有任何影响。
英文摘要：
The present study reports the catalytic action of two-dimensional (2D) layered materials (MoS2 and WS2) for improving the de/re-hydrogenation kinetics of MgH2. The MgH2 start desorbing at 277 C with a hydrogen storage capacity of 5.95 wt% in the presence of WS2 catalyst whereas onset desorption temperature of MgH2 catalyzed by MoS2 is 330 C. The MgH2-WS2 absorbed hydrogen ~ 3.72 wt% within 1.3 minutes at 300 C under 13 atm hydrogen pressure and it desorbed ~5.57 wt% within 20 minutes at 300 C under 1 atm hydrogen pressure. We have performed 25 cycles of dehydrogenation (under 1 atm hydrogen pressure at 300 C) and re-hydrogenation (under 13 atm hydrogen pressure at 300 °C) to ensure cyclic stability of catalyzed version of MgH2 where MgH2-WS2 shows better cyclic stability than MgH2-MoS2. MgH2-WS2 also shows the lower reaction activation energy ~117 kJ/mol as compare to other catalyzed and uncatalyzed samples. On the other hand, these catalysts (WS2 and MoS2) do not have any impact on the thermodynamical parameters that is change in enthalpy.
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