Effects of annealing treatment and partial substitution of Cu for Co on phase composition and hydrogen storage performance of La0.7Mg0.3Ni3.2Co0.35 alloy
Effects of annealing treatment and partial substitution of Cu for Co on phase composition and hydrogen storage performance of La0.7Mg0.3Ni3.2Co0.35 alloy
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DOI：
10.1016/j.ijhydene.2011.02.089
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发表时间：
2012
影响因子：
7.2
通讯作者：
Taizhong Huang;Xianxia Yuan;Jiemei Yu;Zhu Wu;Jitian Han;Guoxin Sun;Naixin Xu;Yihe Zhang
中科院分区：
文献类型：
--
作者：
Taizhong Huang;Xianxia Yuan;Jiemei Yu;Zhu Wu;Jitian Han;Guoxin Sun;Naixin Xu;Yihe Zhang
采用X射线衍射（XRD）、压力成分等温线（PCT）和电化学测试等方法研究了铸态和退火态La0.7Mg0.3Ni3.2Co0.35− XCuX合金的相组成、吸放氢和电化学性能。结果表明，铸态合金中La2Ni7相和LaNi相共存，而退火态合金中只有La0.98Ni5.10相。退火态合金的最大贮氢容量和可逆贮氢容量均高于铸态合金，且平台性能有较大改善。Cu替代Co使退火态合金的电化学放电容量低于铸态合金。
In this paper, the phase composition, hydrogen absorption/desorption as well as electrochemical characteristics of as-cast and annealed La0.7Mg0.3Ni3.2Co0.35−XCuXalloys were investigated by X-ray diffraction (XRD), pressure composition isotherm (PCT) and electrochemical measurements. The results showed that La2Ni7phase and LaNi phase coexisted in the as-cast alloys, but only La0.98Ni5.10phase was detected in the annealed alloys. The maximum and reversible hydrogen storage capacities of the annealed alloys were higher than that of as-cast alloys, with greatly improved plateau performance. The substitution of Cu for Co made the electrochemical discharge capacity of the annealed alloys lower than that of as-cast alloys.