能源化学(英文版)

能源化学(英文) ›› 2014, Vol. 23 ›› Issue (3): 287-290.DOI: 10.1016/S2095-4956(14)60149-2

• ARTICLES • 上一篇    下一篇

Improved electrochemical hydrogen storage properties of Mg-Y thin films as a function of substrate temperature

Yanyan Wang, Gongbiao Xin, Chongyun Wang, Huiyu Li, Wei Li, Jie Zheng, Xingguo Li   

  1. Beijing National Laboratory for Molecular Sciences (BNLMS), (The State Key Laboratory of Rare Earth Materials Chemistry and Applications), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
  • 收稿日期:2013-12-09 修回日期:2014-02-19 出版日期:2014-05-24 发布日期:2014-05-25
  • 通讯作者: Xingguo Li
  • 基金资助:

    This work was supported by the MOST of China (No. 2010CB631301 and 2012CBA01207) and NSFC (No. U1201241, 11375020 and 21321001).

Improved electrochemical hydrogen storage properties of Mg-Y thin films as a function of substrate temperature

Yanyan Wang, Gongbiao Xin, Chongyun Wang, Huiyu Li, Wei Li, Jie Zheng, Xingguo Li   

  1. Beijing National Laboratory for Molecular Sciences (BNLMS), (The State Key Laboratory of Rare Earth Materials Chemistry and Applications), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
  • Received:2013-12-09 Revised:2014-02-19 Online:2014-05-24 Published:2014-05-25
  • Supported by:

    This work was supported by the MOST of China (No. 2010CB631301 and 2012CBA01207) and NSFC (No. U1201241, 11375020 and 21321001).

摘要： Pd-capped Mg78Y22 thin films have been prepared by direct current magnetron co-sputtering system at different substrate temperatures and their electrochemical hydrogen storage properties have been investigated. It is found that rising substrate temperature to 60 ℃ can coarsen the surface of thin film, thus facilitating the diffusion of hydrogen atoms and then enhancing its discharge capacity to ～1725 mAh·g-1. Simultaneously, the cyclic stability is effectively improved due to the increased adhesion force between film and substrate as a function of temperature. In addition, the specimen exhibits a very long and flat discharge plateau at about -0.67 V, at which nearly 60% of capacity is maintained. The property is favorable for the application in metal hydride/nickel secondary batteries. The results indicate that rising optimal substrate temperature has a beneficial effect on the electrochemical hydrogen storage of Mg-Y thin films.

关键词: Mg-Y thin films, substrate temperature, electrochemical hydrogen storage, discharge capacity, cyclic stability, metal hydride/nickel secondary batteries

Abstract: Pd-capped Mg78Y22 thin films have been prepared by direct current magnetron co-sputtering system at different substrate temperatures and their electrochemical hydrogen storage properties have been investigated. It is found that rising substrate temperature to 60 ℃ can coarsen the surface of thin film, thus facilitating the diffusion of hydrogen atoms and then enhancing its discharge capacity to ～1725 mAh·g-1. Simultaneously, the cyclic stability is effectively improved due to the increased adhesion force between film and substrate as a function of temperature. In addition, the specimen exhibits a very long and flat discharge plateau at about -0.67 V, at which nearly 60% of capacity is maintained. The property is favorable for the application in metal hydride/nickel secondary batteries. The results indicate that rising optimal substrate temperature has a beneficial effect on the electrochemical hydrogen storage of Mg-Y thin films.

Key words: Mg-Y thin films, substrate temperature, electrochemical hydrogen storage, discharge capacity, cyclic stability, metal hydride/nickel secondary batteries