摘要
系统研究了La0.8-xPrxMg0.2Ni3.8和La0.8-xPrxMg0.2Ni3.2Al0.2Co0.4(x=0,0.15,0.3,0.4)两组储氢合金的相结构与电化学性能。相结构分析表明,合金主要由Pr5Co19、Ce5Co19、CaCu5型物相组成。随着x的增加,合金中A5B19(Pr5Co19+Ce5Co19)型物相逐渐增多,同时各物相的晶胞参数(a,c)和晶胞体积(v)均减小。Al元素的加入有利于CaCu5型物相的形成。电化学测试表明,A5B19型相合金具有较好的电化学循环稳定性,Al、Co元素的加入有利于A5B19型相合金电极的电化学循环稳定性。
The phase structure and electrochemical properties of La0.8-xPrxMg0.2Ni3.8 and La0.8-xPrxMg0.2Ni3.2Al0.2Co0.4 (x=0, 0.15, 0.3, 0.4) hydrogen storage alloys were investigated systematically. The structure analyses show that the alloys are mainly composed of multiphases, such as Pr5Co19 phase, Ce5Co19 phase and CaCu5 phase. The increase of Pr content in the alloys leads to an increase of the A(5)B(19) (Pr5Co19 +Ce5Co19)-type phases; at the same time, both the lattice parameters (a, c) and the cell volume (v) for all phases are also decreased. Al element addition favors the formation of CaCu5-type phase. The electrochemical test indicates that the A(5)B(19)-type phase alloy has good electrochemical cycle stability, and the Al and Co elements can improve the electrochemical cycle stability of A(5)B(19)-type phase alloys.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第12期2142-2146,共5页
Rare Metal Materials and Engineering
基金
宁夏大学自然科学研究基金(ZR200818)
宁夏自然科学基金(NZ0918)
国家民委“粉体材料与特种陶瓷”重点实验室开放基金(0902)
