Co-B合金粉体的制备和电化学行为 |
| |
引用本文: | 吕东生,李伟善,谭春林,曾荣华. Co-B合金粉体的制备和电化学行为[J]. 金属学报, 2010, 0(3) |
| |
作者姓名: | 吕东生 李伟善 谭春林 曾荣华 |
| |
作者单位: | 华南师范大学化学与环境学院;广东省高等学校电化学储能和发电技术重点实验室; |
| |
基金项目: | 广东省高校优秀青年教师培养计划(育苗工程)资助项目~~ |
| |
摘 要: | 通过NaBH_4还原CoSO_4溶液制备了Co_(0.68)B_(0.32),Co_(0.55)B_(0.45)和Co_(0.50)B_(0.50)一系列超细非晶态Co-B合金粉体.电化学测试表明,在300 mA/g的高电流密度下,3种合金电极的首次放电容量分别高达510.6,666.4和667.2 mA·h/g,经60次循环后,放电容量仍分别有331.6,379.5和390.5 mA·h/g.3种合金电极还表现出良好的高率放电性能,在1200 mA/g的放电电流密度下,放电容量分别为336.2,373.4和390.1 mA·h/g.较高的B含量有助于提高合金的电化学性能,这是因为B的氧化溶解能提高合金电极的实际电化学反应面积.
|
关 键 词: | Co-B合金 非晶粉体 化学还原 电化学性能 |
PREPARATION AND ELECTROCHEMICAL BEHAVIORS OF Co-B ALLOY POWDERS |
| |
Abstract: | Alkaline rechargeable batteries,such as Ni/Cd batteries and Ni/MH batteries have been widely used as power sources,however,their further applications are limited due to contamination of Cd in Ni/Cd batteries and lower discharge capacities of Ni/MH batteries.Some metal borides, such as Co-B,Ni-B,Fe-B,V-B and Ti-B,have been known to own very high discharge capacity in alkaline aqueous solution,in which Co-B alloy exhibits the highest reversible discharge capacity and the best cyclic stability.However,the reve... |
| |
Keywords: | Co-B alloy amorphous powder chemical reduction electrochemical property |
本文献已被 CNKI 等数据库收录! |
|