Zhejiang University, Hangzhou 310027, China

Phase-structure and Hydrogen Storage Behaviors of Mg+10% Ni2P Composite Prepared by Reactive Ball-Milling

摘要:

采用反应球磨法制备了Mg+10%Ni2P（质量分数，下同）新型复合物，对比研究了球磨复合物和球磨纯镁的相结构与储氢性能。研究表明：在纯Mg中添加10%的Ni2P进行复合球磨，可以明显提高其吸/放氢性能。此外，添加Ni2P球磨明显地改善了镁的循环放氢性能。复合物的晶粒尺寸随着球磨时间的增加而减小；添加Ni2P能有效地抑制Mg/MgH2在吸/放氢过程中产生团聚；在Mg中添加Ni2P球磨能降低体系的放氢反应温度。

Abstract:

Mg+10%Ni2P composite (mass fraction, similarly hereinafter) and pure magnesium samples were prepared by reactive ball-milling under hydrogen atmosphere, and their phase-structure and hydrogen storage behavior were investigated systemically. The results show that the hydrogen absorption/desorption kinetics of pure Mg are markedly improved by adding 10% Ni2P. Furthermore, the catalytically enhanced kinetic property is found to persist in the de-/hydrogenation cycles. The size of crystal grains of the composite is reduced by prolonging the ball-milling time. Ni2P is effective in inhibiting the aggregation of Mg during the de-/hydrogenation processes. The doping of Ni2P can lower the dehydriding temperatures of the hydriding Mg-Ni2P composites.