摘要
NaAlH4 complex hydrides doped with lanthanon hydrides were prepared by hydrogenation of the ball-milled NaH/Al＋ xrnol.% RE-H composites （RE=La, Ce; x=2, 4, 6） using Nail and A1 powder as raw materials. The influence of lanthanon hydride catalysts on the hydriding and dehydriding behaviors of the as-synthesized composites were investigated. It was found that the com- posite doped with 2 mol.% LaH3.01 displayed the highest hydrogen absorption capacity of 4.78 wt.% mad desorption capacity of 4.66 wt.%, respectively. Moreover, the composite doped with 6 mol% CEH2.51 showed the best hydriding/dehydriding reaction kinetics. The proposed catalytic mechanism for reversible hydrogen storage properties of the composite was attributed to the presence of active LaH3.01 and CeH2.51 particles, which were scattering on the surface of Nail and A1 particles, acting as the catalytic active sites for hydrogen diffusion and playing an important catalytic role in the improved hydriding/dehydriding reaction.
NaAlH4 complex hydrides doped with lanthanon hydrides were prepared by hydrogenation of the ball-milled NaH/Al＋ xrnol.% RE-H composites （RE=La, Ce; x=2, 4, 6） using Nail and A1 powder as raw materials. The influence of lanthanon hydride catalysts on the hydriding and dehydriding behaviors of the as-synthesized composites were investigated. It was found that the com- posite doped with 2 mol.% LaH3.01 displayed the highest hydrogen absorption capacity of 4.78 wt.% mad desorption capacity of 4.66 wt.%, respectively. Moreover, the composite doped with 6 mol% CEH2.51 showed the best hydriding/dehydriding reaction kinetics. The proposed catalytic mechanism for reversible hydrogen storage properties of the composite was attributed to the presence of active LaH3.01 and CeH2.51 particles, which were scattering on the surface of Nail and A1 particles, acting as the catalytic active sites for hydrogen diffusion and playing an important catalytic role in the improved hydriding/dehydriding reaction.
基金
supported by the National Basic Research Program of China(2010CB631300)
National Natural Science Foundation of China(51171173,51001090)
University Doctoral Foundation of the Ministry of Education(20090101110050)
Key Science and Technology Innovation Team of Zhejiang Province(2010R50013)
