【摘要】 用共沉淀还原扩散法制备了不同化学计量比的LaMg2Ni9-xCox(x=0.3~6.0)和MlMg2Ni9-xCox(x=0.3~4.5)稀土镁基储氢电极合金。电化学测试结果表明:制得的合金活化性能良好;在Co含量x逐渐增大的过程中,合金的活化次数没有发生明显的变化,合金的放电容量逐渐减小,合金的循环稳定性逐渐增强。混合稀土合金比纯镧合金的活化次数多、放电量小,但是循环稳定性好。合金结构分析表明,合金主相为MgNi2相和LaNi5相,随着Co含量增加,LaCo5相和LaCo3相含量增加。更多还原

【Abstract】 Rare-earth Mg-based hydrogen storage electrode alloys of LaMg2Ni9-xCox(x=0.3~6.0) and MlMg2Ni9-xCox(x=0.3~4.5) with different stoichiometric ratios were prepared by coprecipitation-reduction-diffusion method. Electrochemical analyses showed that the alloys prepared by this method can be easily activated; with x increasing, no obvious change for the activity numbers, and the discharge capacity decreased and the cyclic stability of alloy electrodes was effectively improved. Their activity numbers were larger than La-alloys, the discharge capacity decreased and the cyclic stability of mix-alloys was better than La-alloys. Structure analyses showed that the main phases of alloys were MgNi2 and LaNi5, the amount of LaCo5 phase and LaCo3 phase increased with Co content increasing.更多还原