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Improvements of kinetic properties of LiBH4 by supporting on MSU-H type mesoporous silica

C. COMANESCU1, C. GURAN1, P. PALADE2,*

Affiliation

  1. Politehnica University of Bucharest, 011061 Gheorghe Polizu 1-7, Bucharest, Romania
  2. National Institute of Materials Physics, Atomistilor 105 bis, 077125 Magurele, Romania

Abstract

Lithium borohydride (LiBH4) is a promising material for hydrogen storage, featuring a high gravimetric storage density (above 13 wt. % in the first decomposition step). However, studies of re-hydrogenation of the decomposition products have proven less successful, leading us to the requirement of modified-LiBH4 materials with better absorption-desorption behavior. A Mo-doped mesoporous material was obtained starting from commercial MSU-H and ammonium molybdate. This mesoporous material (MSU-H-type functionalized with molybdenum salt) was used as support in order to impregnate LiBH4. Even though the thermodynamics of LiBH4 hydrogen absorption-desorption is not modified, the desorption kinetics of supported LiBH4 is improved compared to that of pure LiBH4. Moreover, after re-hydrogenation at 450 0C only 3.2 wt. % H2 of storage capacity is recovered for LiBH4, while for supported LiBH4 we achieved almost 5.2 wt. % H2..

Keywords

Hydrogen storage materials, XRD, SEM, Mesoporous materials, MSU-H, Silica.

Citation

C. COMANESCU, C. GURAN, P. PALADE, Improvements of kinetic properties of LiBH4 by supporting on MSU-H type mesoporous silica, Optoelectronics and Advanced Materials - Rapid Communications, 4, 5, May 2010, pp.705-708 (2010).

Submitted at: April 24, 2010

Accepted at: May 20, 2010