Structural and Electrochemical Hydrogen Storage Properties of AB4-type La2YNi12-xMnx(x=0.5,1.0,1.5)Alloys
The forming regularities and electrochemical hydrogen storage properties of AB4-type superlattice phases in the La-Y-Ni-Mn system were explored.AB4-type La2YNi12-xMnx(x=0.5,1.0,1.5)hydrogen storage alloys were designed,and 3R-AB4-type La2YNi11Mn single-phase alloy was prepared by optimizing the quenching temperature.The study found that as the quenching temperature increased,the A5B19 phase transforms into AB4 phase,and the AB4 single-phase alloy could be ob-tained at 997 ℃.The substitution of Mn for Ni increases the cell volume of the phase and the volume of the[A2B4]subunit,which enhances the structural stability and the electrochemical properties of the alloy.The maximum discharge capacity of AB4 single-phase alloy is 346 mAh/g,and the cyclic capacity is 216.6 mAh/g after 300 charge/discharge cycles.
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