Abstract：The La0.625Mg0.375Ni2.485Co0.525Mn0.28Al0.21 hydrogen storage alloys were prepared by melting and melting+rapid quenching in this paper. The structure, electrochemical performance and catalytic performance for BH4- of the alloy samples were analyzed by XRD, SEM and electrochemical analysis methods, respectively. The results show that the as-cast La0.625Mg0.375Ni2.485Co0.525Mn0.28Al0.21 alloy is composed of a large amount of LaNi5 phase and a small amount of La2Ni7 and LaNi3 phases. However, the rapid quenched La0.625Mg0.375Ni2.485Co0.525Mn0.28Al0.21 alloy is almost composed of a single LaNi5 phase. Electrochemical tests show that the electrochemical properties of the as-cast alloy are significantly better than that of the rapid quenching alloy, which is related to the content of the rare earth-rich La2Ni7 and LaNi3 phases in the alloy. Generally, the rare earth-rich La2Ni7 and LaNi3 phases have better hydrogen storage performance than that of LaNi5 phases. In a study of the catalytic properties of the alloy samples for BH4-, it was found that both hydrogen storage alloys have a catalytic effect for BH4-, but the as-cast alloy had better catalytic properties. It can be seen that the hydrogen storage alloys with the better electrochemical performance generally have better catalytic performance as anode catalyst for DBFC.
2022, Vol. 29 