球磨CeMg_(12)+100%Ni合金热力学及电化学贮氢性能

Thermodynamics and electrochemical hydrogen storage properties of ball milling CeMg_(12)+100%Ni alloys

用球磨工艺制备CeMg12+100%Ni电极合金,研究了球磨工艺对合金结构及电化学性能的影响。结果表明球磨CeMg12+100%Ni合金具有非晶纳米晶结构,由Mg2Ni相以及Ni相组成,其含量随球磨时间的延长而增加,这在一定程度上改善了合金的电化学放电性能。球磨非晶纳米晶具有较好的结构稳定性,在吸氢后形成的氢化物相仍保持非晶纳米晶尺度,这有利于降低氢化物的热稳定性,改善电化学放电性能。

The CeMg12＋100%Ni alloy samples were prepared by ball milling technology.The effects of ball-milled technology on microstructure and electrochemical performances of the alloys were investigated in detail.The results showed that the milled CeMg12＋100%Ni alloys with nanocrystalline and amorphous structure consisted of Mg2Ni phase and Ni phase,the amount of phase increased with prolonging ball-milling duration,which improved electrochemical discharge capacity to a certain extent.On the other hand,the ball milling nanocrystalline and amorphous possessed good structural stability,the hydride phase after absorbing hydrogen kept nanocrystalline and amorphous scale,which reduced hydride thermal stability to some degree,ameliorating electrochemical discharge ability markedly.