系统研究了贮氢电极合金La0.7Mg0.3Ni2.65Co0.75Mn0.1Al0.2B,x(x=0,0.02,0.04,0.08)的微结构与电化学性能.XRD结果显示,所有合金均由(La,Mg)Ni3相与LaNi5相组成,B含量的增加导致(La,Mg)Ni,3相的丰度不断增加,相应地LaNi5相的丰度逐渐下降.此外,合金的晶格参数与晶胞体积均随B含量的增加而减小.电化学测试分析表明,B的添加可以显著改善合金电极的高倍率放电性能,当B含量为0.04时达到最佳.微量B的加入对合金的循环稳定性能与活化性能影响很小,但降低合金电极的最大放电容量.此外还采用线性极化与阳极极化对合金电极的动力学性能进行了进一步研究.
The structural and electrochemical properties of Lao.7Mg0.3Ni2.65Co0.75Mn0.1Al0.2Bx (x=0-0.08) hydrogen storage electrode alloys were investigated systematically. The results from XRD show that all of the alloys consist of a (La, Mg)Ni3 phase and a LaNi5 phase. With the increase of B content, the abundance of the (La, Mg)Ni3 phase increases, accordingly that of the LaNi5 phase decreases, and the cell volumes of the two phases decrease. Electrochemical studies indicate that B addition can effectively improve the high rate dischargeability (HRD) of the alloy electrode, and the optimal value of HRD1000 reaches 57.1% as x being 0.04. With the addition of small amount of B, the cycling stability and activation properties of the alloy electrodes keep almost unchanged, but the maximum discharge capacity (Cmax) decreases. In addition, the electrochemical kinetics investigations including the linear polarization and anodic polarization were also performed in detail.
参考文献
| [1] | Willems J J C;Buschow K H J .[J].Journal of the Less-Common Metals,1987,129:13. |
| [2] | 刘社社,张鹏,魏学东,柳永宁,朱杰武.Ti基贮氢合金Ti0.3Zr0.225V0.25Mn0.3-xNi0.45+x（x=0～0.25）的显微组织及电化学性能[J].稀有金属材料与工程,2006(12):1983-1986. |
| [3] | 马建新 et al.[J].材料科学与工程,1999,17(01):65. |
| [4] | 袁华堂,李秋荻,王一菁,宋赫男,冯艳.新型镁基储氢合金的合成及电化学性能的研究[J].高等学校化学学报,2002(04):517-520. |
| [5] | Kumar S;Balasubramaniam R .[J].International Journal of Hydrogen Energy,1995,20:211. |
| [6] | Kadir K;Kuruyama N;Sakia T et al.[J].Journal of Alloys and Compounds,1999,284:145. |
| [7] | Kadir K;Sakai T;Uchara I et al.[J].Journal of Alloys and Compounds,1997,257:115. |
| [8] | Kadir K;Sakai T;Uchara I et al.[J].Journal of Alloys and Compounds,2000,302:112. |
| [9] | Kohno T;Yoshida H;Kawashima F et al.[J].Journal of Alloys and Compounds,2000,311(02):L5. |
| [10] | Pan H G;Liu Y F;Gao M X et al.[J].Journal of Alloys and Compounds,2003,351:228. |
| [11] | Pan H G;Liu Y F;Gao M X et al.[J].International Journal of Hydrogen Energy,2003,28(01):113. |
| [12] | Pan H G;Chen N;Gao M X et al.[J].Journal of Alloys and Compounds,2005,397:306. |
| [13] | Zhang Y G;Chen M Y;Wang X L et al.[J].Journal of Power Sources,2004,125:273. |
| [14] | Ye H;Huang Y X;Huang T S et al.[J].Journal of Alloys and Compounds,2002,330-332:866. |
| [15] | Lee S M;Perng T P .[J].International Journal of Hydrogen Energy,2000,25:831. |
| [16] | Sakai T;Oguro K;Miyamura H et al.[J].Journal of the Less-Common Metals,1990,161:193. |
| [17] | Ye H;Huang Y X;Chen J X et al.[J].Journal of Power Sources,2002,103:293. |
| [18] | Kuriyama N;Sakai T;Miyamura H et al.[J].Journal of Alloys and Compounds,1993,202:183. |
| [19] | Pan H G;Chert Y;Wang C S et al.[J].Electrochimica Acta,1999,44:2263. |
| [20] | Notten P H L;Hokeling E J .[J].Journal of the Electrochemical Society,1991,138:1877. |
| [21] | Ratnakumar BV.;Bowman RC.;Hightower A.;Fultz B.;Witham C. .ELECTROCHEMICAL STUDIES ON LANI5-XSNX METAL HYDRIDE ALLOYS[J].Journal of the Electrochemical Society,1996(8):2578-2584. |
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