Exceptional electrochemical activities of amorphous Fe–B and Co–B alloy powders used as high capacity anode materials
Exceptional electrochemical activities of amorphous Fe–B and Co–B alloy powders used as high capacity anode materials
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DOI：
10.1016/j.elecom.2004.06.002
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发表时间：
2004-08
影响因子：
5.4
通讯作者：
Y. Wang;X. Ai;Y. Cao;H. Yang
中科院分区：
文献类型：
--
作者：
Y. Wang;X. Ai;Y. Cao;H. Yang
合成了Fe-B和Co-B超细非晶合金粉末（UAAP），并测试了其作为电活性阳极材料的可能性。结果表明，Fe-B和Co-B合金粉末在碱性溶液中作为阳极材料时，与其母体元素过渡金属（TM）和硼不同，表现出上级的电化学活性。Fe-B和Co-B电极在100 mAh/g的中等高倍率下的放电容量分别为1200和1100 mAh/g，远高于目前使用的锌金属的理论容量（820 mAh/g）。硼化物合金的高容量是由于高分散过渡金属原子中硼原子的电化学活化。因此，活化的硼将电极电势箝位到负区域以防止过渡金属钝化。
Ultrafine amorphous alloy powders (UAAP) of Fe–B and Co–B were synthesized and tested for possible use as electroactive anodic materials. It is found that unlike their parent elements, the transition metal (TM) and boron, the Fe–B and Co–B alloy powders show superior electrochemical activities when used as anodic materials in aqueous alkaline solution. The discharge capacities of Fe–B and Co–B electrodes were observed to be 1200 and 1100 mAh/g at moderately high rate of 100 mAh/g, respectively, much higher than the theoretical capacity of currently used zinc metal (820 mAh/g). The exceptional high capacities of the boride alloys were found due to the electrochemical activation of boron atoms in the highly dispersed transition metal atoms. Inversely, the activated boron clamps the electrode potential to a negative region to prevent the transition metal from passivating.