摘要
在强阴极极化下,以析出的氢气泡为模板,电沉积制备了La-Ni贮氢合金薄膜电极。采用扫描电子显微镜(SEM)及X射线衍射仪(XRD)对合金薄膜电极的表面形态和结构进行了表征;以循环伏安、恒电流充放电实验考察了合金薄膜电极的电化学行为。结果表明,合金薄膜电极含La Ni5相,电化学吸放氢性能好,最高电化学放电比容量达286 m Ah/g,无需活化过程,首次充放电即可达到最高放电容量,作为氢镍电池的负极,在1.2 V附近有一个平稳的放电平台。
La-Ni hydrogen storage alloy thin-film electrode was prepared using hydrogen bubbles as template in strong cathodic polarization. Morphologies and structures of alloy thin-film electrode were characterized by X-ray diffraction and scanning electron microscopy. The electrochemical performance of alloy thin-film electrode was studied using cycle voltammetry and charge-discharge tests. The results show that the main composition is LaNis, which has better hydrogen storage and desorption capability. The highest discharge capacity is 286 mAh/g. Ni-MH batteries using the alloy films as cathode had steady discharge plateau and the first charge-discharge capacity of the alloy films will reach the highest in the no activated treatment.
出处
《电源技术》
CAS
CSCD
北大核心
2015年第7期1449-1451,共3页
Chinese Journal of Power Sources
基金
河南省工业攻关项目(102102210140)
河南省教育厅自然科学研究计划项目(2010A53001)
关键词
电沉积
氢气泡模板
镧镍合金薄膜电极
电化学性能
electrodeposition
hydrogen bubbles template
La-Ni alloy thin-film electrode
electrochemical performance
