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La_0.67-x（Ti/Zr）_xMg_0.33Ni_2.5Co_0.5（x=0～0.15）贮氢合金结构和电化学性能

Phase Structure and Electrochemical Properties of the Co-Free La_0.67-x（Ti/Zr）_xMg_0.33Ni_2.5Co_0.5（x=0～0.15） Hydrogen Storage Electrode Alloys

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【Author】 Zhang Faliang1, Luo Yongchun1, Wang Dahui1, Yan Ruxu1, Wu Jingran2, Chen Jianhong1 (1. State Key Laboratory of advanced Nonferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China) (2. Chengde Petroleum College, Chengde 067000, China)

【机构】兰州理工大学有色金属新材料国家重点实验室；承德石油高等专科学校；兰州理工大学有色金属新材料国家重点实验室甘肃兰州730050；甘肃兰州730050；河北承德067000；

【摘要】采用感应熔铸+热处理的方法制备了La(0.67-x)(Ti/Zr)xMg0.33Ni2.5Co0.5合金。结构分析表明,合金由PuNi3型相、Ce2Ni7型相、MgCu4Sn型相和Ti-Ni或Zr-Ni合金相等组成;Ti/Zr元素在PuNi3型物相和Ce2Ni7型物相中没有固溶,而是单独以Ti-Ni和Zr-Ni合金的形式存在;随Ti和Zr含量的增多,合金中PuNi3型物相的单胞体积呈线性减小趋势。Ti和Zr元素的掺入提高了合金的吸放氢平台,降低了合金的贮氢量。电化学研究表明,Ti/Zr元素显著提高了合金电极的高倍率放电性能,但过量的Zr元素会恶化合金电极的电催化活性;Ti/Zr元素的掺入对合金电极循环稳定性有一定改善,但同时会降低合金电极的电化学放电容量。更多还原

【Abstract】 La(0.67-x)(Ti/Zr)xMg0.33Ni2.5Co0.5(x=0~0.15) 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.更多还原