在氩气气氛下,采用机械球磨法制备AlCl3掺杂的4MgH2-Li3 AlH6储氢材料,研究AlCl3对4MgH2-Li3 AlH6脱氢性能的影响.借助热重(TG)法研究了4MgH2-Li3 AlH6-AlCl3体系的放氢性能,并运用X射线衍射(XRD)分析和差示扫描量热(DSC)法对其反应机理进行了探索.实验结果表明,加入AlCl3可有效增加4MgH2-Li3 AlH6体系的反应活性,促进二者分解放氢,并降低该体系的放氢温度,增大总脱氢量.当AlCl3的掺杂量为4％(摩尔分数)、磨球24颗、球磨时间2.0h和转速541 r/min时,4MgH2-Li3 AlH6-AlCl3体系起始放氢温度降至130℃,比4MgH2-Li3 AlH6体系降低了43℃;且400℃时总脱氢量从5.5％(质量分数)增加到6.3％(质量分数).同时,机理研究表明:在球磨过程中部分Li3 AlH6和AlCl3发生反应,产生了活性Al,进而改善了体系的放氢性能.
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