【摘要】 借助Ｘ射线衍射、差热分析及电化学方法，研究了吸氢合金ＬａＮｉ５－ ｘＭｘ 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．结果表明，ＬａＮｉ５－ ｘＭｘ 在２．５ＭＰａ 氢压和大于５５０ ℃保温一定时间后可发生明显歧化反应，并析出纳米相Ｎｉ．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Ｎｉ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更多还原

【Abstract】 X ray diffraction, thermal and electrochemical analysis were used to investigate the disproportionation behaviour of hydrogen storage alloys for LaNi 5- x M x in hydriding process at high temperature and electrochemical properties of the reaction products. The results showed that the disproportionation took place and the precipitated Nano phase metallic Nickel was formed during an certain period of heat preservation at temperature of 550 ℃ and under the pressure of 2.5 MPa. The extent of the disproportionation reaction was closely related to temperature, heating duration substituted third elements M, and the formation enthalpy of the alloys. Measurement of the exchange current density showed that the contained Nano phase Nickel composite structure obtained by the disproportionation reaction exhibited better electrocatalytic characteristics during hydrogen absorption and desorption than the master alloys.更多还原