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采用X射线衍射、差热分析及电化学方法 ,研究了吸氢合金LaNi5-xMx(M =Mn ,Co,Fe,Cr,Al)在高温氢化反应时的歧化行为及其反应产物的电化学性能。LaNi5-xMx 在 2 5MPa氢压和 550℃以上保温一定时间后可发生明显的歧化反应 ,并析出纳米相镍。歧化反应的程度与加热温度、时间、第三组元M及合金的生成焓关系密切。电化学交换电流密度测定表明 ,经歧化反应得到的含纳米相镍的复相组织与原始合金组织相比具有较高的吸放氢电催化活性。
The disproportionation behavior of LaNi5-xMx (M = Mn, Co, Fe, Cr, Al) at high temperature and the electrochemical performance of the reaction product were investigated by X-ray diffraction, differential thermal analysis and electrochemical methods . LaNi5-xMx 2 5MPa hydrogen pressure and 550 ℃ above a certain period of time after the disproportionation reaction occurred, and the precipitation of nano-phase nickel. The degree of disproportionation reaction is closely related to the heating temperature, the time, and the formation enthalpy of the third component M and the alloy. The results of electrochemical exchange current density measurement showed that the complex phase containing nanophase nickel obtained by the disproportionation reaction has higher electrocatalytic activity for hydrogen absorption and desorption than the original alloy.