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Effect of boron additive on electrochemical cycling life of La–Mg–Ni alloys prepared by casting and rapid quenching
- Source :
-
International Journal of Hydrogen Energy . Apr2007, Vol. 32 Issue 5, p594-599. 6p. - Publication Year :
- 2007
-
Abstract
- In order to improve the electrochemical performances of La–Mg–Ni system (PuNi3-type) hydrogen storage alloy, a trace of B was added in La2Mg(Ni0. 85Co0. 15)9 alloy. La2Mg(Ni0. 85Co0. 15)9B () hydrogen storage alloys were prepared by casting and rapid quenching. The electrochemical charging-discharging cycling lives and microstructures of the as-cast and quenched alloys were measured and analyzed. The effects of B additive on the microstructures and cycling lives of as-cast and quenched alloys were investigated in detail. The results show that the as-cast and quenched alloys are composed of the (La, Mg)Ni3 phase (PuNi3 structure), the LaNi5 phase and the LaNi2 phase. A trace of the Ni2B phase exists in the as-cast alloys containing B. The Ni2B phase in the alloys containing B nearly disappears after rapid quenching and the relative ratio of each phase in the alloys changes with the variety of the quenching rate. The addition of B obviously enhances the charging-discharging cycling stabilities of the as-cast and quenched alloys. When B content increases from 0 to 0. 2, the cycling lives of the as-cast and quenched at 20m/s alloys were increased from 72 to 94 cycles and from 86 to 104 cycles, respectively. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 32
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 24217092
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2006.06.051