用冷坩埚磁悬浮熔炼炉制各La0.8-xCexMg0.2Ni3.5(x=0.0.05,0.10,0.15,0.20)贮氢电极合金,采用X射线衍射、三电极体系系统研究合金的微观结构和电化学性能.研究表明:合金为多相结构,主相均为Ce2Ni7型六方相,还包括Cacu5型六方相、PuNi3型菱方相;P-C-T曲线显示,随着Ce含最的增加,合金放氢平台区域变窄,平台压力升高.合金中各组成相单胞体积的减小是其主要原因.随着Ce含量的增加,合金常温最大放电容量逐渐减小并且循环稳定性有一定改善;低温最大放电容量则先增大后减小,合金的低温高倍率放电性能以及交换电流密度均随Ce含量的增加而增加,但氢扩散系数随着Ce含量的增加而减小.
参考文献
| [1] | Ye S H et al.[J].Journal of Alloys and Compounds,1999,292(12):191. |
| [2] | Hong K .[J].Journal of Alloys and Compounds,2001,321(02):307. |
| [3] | Hirohisa U et al.[J].International Journal of Hydrogen Energy,1999,27(09):871. |
| [4] | 雷永泉.新能源材料[M].天津:天津大学出版社,2000:52. |
| [5] | Sakai L et al.[J].Journal of the Electrochemical Society,1990,137:795. |
| [6] | Kohno Yoshida H et al.[J].Journal of Alloys and Compounds,2000,311:15. |
| [7] | 刘永峰 et al.[J].金属学报,2003,39(06):666. |
| [8] | 刘丽琴,唐睿,柳永宁.稀土元素对La0.8 Mg0.2 Ni2.8 Co0.6 储氢合金性能的影响[J].中国有色金属学报,2003(04):871-875. |
| [9] | Nelson R F .[J].Journal of Power Sources,2000,91:2. |
| [10] | Erhacher K .[J].Journal of Power Sources,1999,80:265. |
| [11] | 叶辉.[A].Chongqing:New Energy Sources Press,2001:127. |
| [12] | Notton P H L et al.[J].Journal of the Electrochemical Society,1991,138(07):1877. |
| [13] | Precheron-Guegan A et al.[J].Journal of the Less-Common Metals,1990,161:193. |
| [14] | Pan H G et al.[J].Journal of Alloys and Compounds,2004,373:237. |
| [15] | 马建新,潘洪革,李寿权,陈长聘.RE（NiCoMnAl）5电极合金中RE成分对微结构和电化学性能的影响[J].稀有金属材料与工程,2002(03):217-220. |
| [16] | Notten P H L et al.[J].Journal of the Electrochemical Society,1991,138:1877. |
| [17] | Nishina T.;Uchida I.;Ura H. .DETERMINATION OF CHEMICAL DIFFUSION COEFFICIENTS IN METAL HYDRIDE PARTICLES WITH A MICROELECTRODE TECHNIQUE[J].Journal of the Electrochemical Society,1997(4):1273-1277. |
| [18] | Zheng G.;White RE.;Popov BN. .ELECTROCHEMICAL DETERMINATION OF THE DIFFUSION COEFFICIENT OF HYDROGEN THROUGH AN LANI4.25AL0.75 ELECTRODE IN ALKALINE AQUEOUS SOLUTION[J].Journal of the Electrochemical Society,1995(8):2695-2698. |
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