Phase structure and electrochemical properties of the Co-free La(0.67-x)(Ti/Zr)(x)Mg0.33Ni2.5Co0.5(x=0 similar to 0.15) hydrogen storage electrode alloys

作者：Zhang Faliang^*; Luo Yongchun; Wang Dahui; Yan Ruxu; Wu Jingran; Chen Jianhong

来源：Rare Metal Materials and Engineering, 2006, 35(6): 900-904.

• hydrogen storage alloy
• PuNi3-type
• phase structure
• electrochemical properties

La(0.67-x)(Ti/Zr)(x)Mg0.33Ni2.5Co0.5(x=0 similar to 0.15) were prepared by induction melting and annealing treatment. The structure analysis of alloys shows that the alloys are composed of multiphase, such as PuNi3-type phase, Ce2Ni7-type phase, MgCu4Sn-type phase, Ti-Ni or Zr-Ni phase. Ti and Zr elements didn't exist in PuNi3-type phase and Ce2Ni7-type phase, and formed the Ti-Ni alloy and Zr-Ni alloy, respectively. With the contents of Ti and Zr increasing, the unit cell volume of PuNi3-type phase in alloys presented a linear decrease. The addition of Ti/Zr element heightened the plateau pressure of hydride, improved the cyclic stability of alloy electrodes to some extent, and reduced the capacity of hydrogen storage. Electrochemical analysis shows that the discharge ability is improved obviously to a high rate with the addition of Ti/Zr element, but the superfluous Zr element can reduce the electrochemical catalysis.

• 出版日期2006-6
• 单位兰州理工大学