Citation: YANG Gui-Ling, WANG Chun, YANG Xiao-Min, ZHAO Na, JIAO Xiao-Yan. Synergistic Effect of a Nonmetal and a Metal on the Electrochemical Properties of a Mg-Based Hydrogen Storage Alloy[J]. Acta Physico-Chimica Sinica, 2010, 26(04): 833-839. doi: 10.3866/PKU.WHXB20100438
非金属与金属的协同作用对镁基储氢合金电化学性能的影响
用机械球磨法分别以Ti、B、复合物TiB对非晶态Mg45Ti3V2Ni50储氢合金进行了表面修饰. 实验结果表明, 恰当比例的TiB球磨修饰对镁基储氢合金循环稳定性远好于Ti、B 同比例单独修饰合金电极的效果. Mg45Ti3V2Ni50与TiB质量比为2:1的Mg45Ti3V2Ni50-TiB(2:1)复合合金电极的初始放电容量为529.4 mAh·g-1, 第50次循环放电容量仍为277.1 mAh·g-1. 复合物TiB 中Ti、B元素之间和复合合金中合金元素与TiB之间产生了金属与非金属的协同作用, 导致复合合金新的立体褶皱结构的生成, 增强了修饰层与合金间的作用, Mg45Ti3V2Ni50-TiB(2:1)合金电极表面活性增强, 循环稳定性显著提高.
English
Synergistic Effect of a Nonmetal and a Metal on the Electrochemical Properties of a Mg-Based Hydrogen Storage Alloy
The surface of an amorphous Mg45Ti3V2Ni50 alloy was modified with Ti, B, and a specific composite TiB by high energy ball-milling. Experimental results showed that after modification the electrochemical stability of the hydrogen storage alloy improved and the improvement for TiB was much more than that for Ti or B. The initial discharge capacity of the Mg45Ti3V2Ni50-TiB alloy electrode (mass ratio 2:1) was 529.4 mAh·g-1 and after 50 cycles the discharge capacity was 277.1 mAh·g-1. A synergistic effect between the metal and nonmetal was formed evidently not only between Ti and B in TiB but also between TiB and the Mg45Ti3V2Ni50 alloy. This synergistic effect enhanced the interaction between the modified layer and the Mg45Ti3V2Ni50 alloy. A new stereochemical pleats structure was formed by the synergistic effect between the metal and the nonmetal. The surface activity of the Mg45Ti3V2Ni50 alloy was increased and the electrochemical cycling stability improved greatly.
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