MgNi-ZrB储氢合金的电化学性能(英文)

Electrochemical Properties of MgNi-ZrB Hydrogen Storage Alloys

通过机械球磨法制备了一系列的Mg Ni、Zr B和Mg Ni-Zr B储氢合金。通过XRD、SEM、充放电性能、循环伏安、塔菲尔极化曲线、交流阻抗测试,研究了Zr B的添加对Mg Ni合金的储氢性能的影响。结果表面,Zr B的添加大大提高了Mg Ni合金的电化学性能。球磨15 h的Mg Ni-Zr B(100:5)复合物体现出最好的电化学性能,循环20周和50周时的放电容量分别为226和209 m Ah·g-1,远远高于Mg Ni合金的放电容量。动态极化曲线和交流阻抗测试显示Zr B的添加极大的提高了Mg Ni合金的抗腐蚀性能和电化学动力学性能。

A series of MgNi-ZrB composites were prepared from MgNi alloy and ZrB alloy by a mechanical alloying （MA） method. The influences of ZrB doping on the structures and the electrochemical properties of MgNi alloy were investigated by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, charge-discharge cycles, cyclic voltammetry （CV）, Tafel polariza- tion and electrochemical impedance spectroscopy （EIS）. The results demonstrate that ZrB doping obviously improves the cycle life of MgNi alloy. The MgNi-ZrB （100：5） composite made from the doped powder ball milled for 15 h exhibits the best electrochemical performances. It shows high discharge capacities of 226 and 209 mAh.g-1 after 20 and 50 cycle, respectively, which are much higher than that of MgNi alloy. Potentiodynamic polarization and EIS tests show that ZrB doping improves the anticorrosion and the elec- trochemical kinetic properties of MgNi alloy significantly.