Dehydrogenation Behavior and Mechanism of LiBH4 Doped with Ce2Mg17 and Its Hydride

作者：Han Leyuan; Xiao Xuezhang; Wang Shunkui; Fan Xiulin; Li Shouquan; Ge Hongwei; Chen Lixin^*

来源：Rare Metal Materials and Engineering, 2014, 43(8): 1935-1938.

• hydrogen storage materials
• LiBH4
• Ce2Mg17
• hydride
• dehydrogenation behavior

LiBH4 was ball milled for 4 h with Ce2Mg17 (CM) and its hydride (CeH2.51 and MgH2, CMH) to prepared LiBH4-0.02CM and LiBH4-0.02CMH samples, respectively. Their dehydrogenation behavior and mechanism were experimentally investigated by MS, TPD, XRD and FT-IR techniques. It is found that Ce2Mg17-hydride of MgH2 and CeH2.51 effectively reduces the hydrogen desorption temperature and improves the dehydriding kinetics of LiBH4. However, Ce2Mg17 alloy exerts few favorable effects to the dehydrogenation behavior of LiBH4. In addition, partial reversibility is achieved for the LiBH4-0.02CMH system. The enhancement of the dehydrogenation and rehydrogenation is ascribed to the synergistic effect of MgH2 and CeH2.51, which reduces the thermodynamics stability of the system.

• 出版日期2014-8
• 单位浙江大学