Grain Size Effect of MgH2 on Dehydrogenation Kinetics of 2LiBH4+MgH2 System

doi:10.7503/cjcu20130449

Abstract

Abstract:

Grain size effect of MgH₂ on dehydrogenation kinetics of the 2LiBH₄+MgH₂ system was investigated. 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 MgH₂. 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.

Key words: LiBH₄, MgH₂, Hydrogen storage, Kinetics, Grain size

CLC Number:

O643

TrendMD:

KOU Hua-Qin, SANG Ge, CHEN Li-Xin, XIAO Xue-Zhang, DENG Shuai-Shuai, HUANG Zhi-Yong. Grain Size Effect of MgH₂ on Dehydrogenation Kinetics of 2LiBH₄+MgH₂ System[J]. Chem. J. Chinese Universities, 2013, 34(10): 2347.

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Grain Size Effect of MgH₂ on Dehydrogenation Kinetics of 2LiBH₄+MgH₂ System

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