摘要
研究了MgH2粒径对2LiBH4+MgH2体系放氢动力学性能的影响.采用高能球磨方式对50~100μm粒径的MgH2预球磨96 h,其粒径可减小到100~200 nm.结果表明,对MgH2进行预球磨可使2LiBH4+MgH2体系的两步放氢温度分别降低58和24℃,并可明显提高体系的放氢动力学性能.XRD结果表明,MgH2粒径的减小有利于放氢过程中MgB2的生成,从而提高体系放氢产物的可逆吸氢能力.
Grain size effect of MgH2 on dehydrogenation kinetics of the 2LiBH4 +MgH2 system was investiga-ted. Experimental results show that the grain size of MgH2 is significantly reduced to 100--200 nm after pre-ball milling for 96 h. It was found that these two step dehydrogenation temperature of 2LiBH4 +MgH2 system was lowered by 58 and 24 ℃ respectively through pre-ball milling MgH:. Meanwhile, the desorption rate was improved obviously as the grain size of MgH2 decreased. X-Ray diffraction (XRD) analysis indicates that the formation of MgB2 in dehydrided products is promoted by decreasing the grain size of MgH2, resulting in an improved reversibility.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第10期2347-2352,共6页
Chemical Journal of Chinese Universities
基金
国家"九七三"计划项目(批准号:2011GB111003
2010CB631300)
国家自然科学基金(批准号:51171173
51001090)
四川材料与工艺研究所基金(批准号:SJ201104)资助