Structure and electrochemical hydrogen storage properties of A₂B-type Ti-Zr-Ni alloys

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• 作者：Xiangyu Zhao ; Junfeng Zhou ; Xiaodong Shen ; ^{xdshen@njut.edu.cn} ; Meng Yang ; Liqun Ma ; ^{maliqun@njut.edu.cn}
• 关键词：Hydrogen storage ; Ti&ndash ; Zr&ndash ; Ni ; Elemental substitution ; Discharge properties
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：March, 2012
• 卷：37
• 期：6
• 页码：5050-5055
• 文件大小：906 K

摘要

Elemental substitution of part Ti by Zr has been carried out for Ti₂Ni alloy to form Ti_2鈭?em>xZr_xNi (x聽=聽0, 0.2, 0.4) alloys. Mechanical milling and subsequent heat treatment have been used to prepare non-equilibrium Ti-Zr-Ni alloys. The effects of Zr addition on the structure and discharge properties of Ti₂Ni alloy were investigated. The addition of Zr could enhance the discharge capacity of the non-equilibrium Ti₂Ni alloy at electrolyte temperatures of 313 and 333聽K. For instance, the non-equlibrium Ti_1.6Zr_0.4Ni alloy had a stable discharge capacity of about 210聽mAh/g at 313聽K. However, the protective surface layer formed during heat treatment was destroyed at a high electrolyte temperature of 333聽K, and thus a severe capacity loss during cycling.