La_xMm_(1-x)(NiCoMnAl)_5合金的贮氢性能

The hydrogen storage properties of La_xMm_(1-x) (NiCoMnAl)_5 alloys

研究了Ｌａｘ Ｍｍ１－ ｘ （ＮｉＣｏＭｎＡｌ）５ 合金的放氢ＰＣＴ曲线和ＭＨ 电极的电化学性能． 随Ｌａ 含量增加，该合金平台压Ｐ和平台斜率ｆｓ 降低，平台斜率随温度的变化率ｋ 和氢在合金和氢化物中的活度系数γ增加． 氢化物形成焓ΔＨ随Ｌａ 含量增加而增加，电化学容量随之增加，同时，大电流放电性能提高．

The PCT curves of  La x Mm 1-x ( NiCoMnAl ) 5 alloys and the electrochemical characteristics of the MH electrode were studied. With the increasing of the La content, the plateau pressure (P) and the plateau slope (f s) decrease while the variation rate of slope factor f s with respect to temperature k and the active coefficient γ of hydrogen in both alloys and in hydrides increase. The formation enthalpy of hydride ΔH and the electrochemical capacity increase with increasing of the amount of La element, at the mean time, the property of high-rate discharge was improved.