Numerical simulation of intrinsic absorption and desorption kinetics for Mg-3Ni-2MnO(2) hydrogen storage materials

作者：Zhang Wencong^*; Liu Lusheng; Wang Zhaoyou; Wang Erde

来源：Rare Metal Materials and Engineering, 2007, 36(2): 226-230.

• Mg-3Ni-2MnO(2) hydrides
• nucleation and growth
• intrinsic kinetics
• mechanical alloying
• hydrogen storage materials

Mg-3Ni-2MnO(2) hydrides are prepared by mechanical alloying under hydrogen atmosphere, and the absorption and desorption kinetics properties are measured. Intrinsic absorption and desorption equations are developed and calculated. The results show that these materials of excellent kinetics properties can be fabricated, and the absorption can be finished in 65 s at 200 degrees C and 2.5 MPa, and the hydrogen absorption capacity is 6.23% (mass); the desorption can be finished in 550 s at 300 degrees C and 0.1 MPa. An Avrami index of about 0.5 indicates that the main process is the growth of discal hydride along the direction of thickness for absorption; the materials behave the character of nucleation and growth for desorption; the new phase growe steadily (no new crystal nucleus appears) according to the Avrami index. The calculated values agree well with the experimental values; the temperature and pressure have effects on the intrinsic kinetic properties.

• 出版日期2007-2
• 单位哈尔滨工业大学