氢气储存
硼
氢化物
电化学
合金
化学计量学
氢
扩散
材料科学
相(物质)
电极
分析化学(期刊)
化学
无机化学
冶金
热力学
物理化学
色谱法
有机化学
物理
作者
Hengqiang Ye,Hui Zhang,W. Q. Wu,T.S Huang
标识
DOI:10.1016/s0925-8388(00)01137-3
摘要
Abstract Over-stoichiometric double-phase MmNi 3.55 Co 0.75 Mn 0.4 Al 0.3 B x compound has been prepared based on the commercial MmNi 3.55 Co 0.75 Mn 0.4 A1 0.3 hydrogen storage alloy by adding boron element. The over-stoichiometric compounds containing boron show CaCu 5 -type main-phase and a small amount of CeCo 4 B-type phases. The abundance of secondary phase increases with the increase of boron content. The addition of boron displays a small influence on thermodynamic characteristics of compounds, whereas it reduces its hydrogen storage capacity. The electrochemical experiments show that the addition of boron modifies the activation performance and significantly improves the high-rate capability. Micro-polarization and constant potential discharge measurement reveal that the appearance of the secondary phase enhances the electrochemical activity of the hydride electrodes’ surface and facilitates hydrogen diffusion in the bulk of the compound.
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