金属镁用作储氢材料时由于表面存在氧化膜,在首次吸氢反应过程中需要一定的时间活化,即存在着吸氢孕育期.为了消除这个孕育期,本文利用高能机械球磨法在金属镁中掺杂卤化钠(NaCl 和 NaBr).结果表明,加入NaCl、NaBr添加剂后,样品Mg-NaCl和Mg-NaBr在2000 kPa氢气压力下,573和608 K时的首次吸氢反应中均没有检测到孕育期的存在,吸氢量分别为5．6和5．0％(质量分数).虽然利用高能机械球磨法掺杂卤化钠能显著改善金属镁的首次吸氢反应动力学性能,但在调控热力学性能方面没有发挥太大的作用.
As one of most potential materials for storing hydrogen,it needs a long time to activate magnesium (i.e.,incubation period)before its initial hydrogen absorption due to the formation of magnesium oxide.In or-der to eliminate the incubation period,alkaline metal chlorides (NaCl and NaBr)were doped into magnesium by high energy ball milling (HEBM).It is found that at 2 000 kPa hydrogen pressure,Mg-NaCl and Mg-NaBr could absorb 5.6 and 5.0wt% hydrogen without an incubation period observed at 573 and 608 K,respectively. This indicates that doping with alkaline metal chlorides by HEBM could give rise to an enhancement of the ki-netics for the initial hydrogenation of magnesium,whereas it has little effect on the alteration of the thermody-namics.
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