Abstract：LaNi5 hydrogen storage alloy powders are easy to be oxidized, seriously affecting the hydrogen storage properties of LaNi5 alloy. In this paper, PMMA (poly methyl meth acrylate) was used to modify the surface of LaNi5 alloy by the solution impregnation method. The micrmorphology, hydrogen storage properties, and oxidation resistance of LaNi5 alloy were investigated. The results show that the hydrogen storage capacity of air-oxidated PMMA-coated LaNi5 alloy after oxidation is maintained at 1.29%, while that of LaNi5 alloy decreases to 1.15% (mass fraction, %, the same below). Compared with the uncoated LaNi5 alloy, the dehydrogenation and hydrogenation kinetic and hydrogen storage capacity of PMMA-coated LaNi5 alloy after air-exposure are well maintained, and the PMMA-coated LaNi5 alloy possesses good cycling stability. Therefore, PMMA-coated LaNi5 alloy can mitigate the oxidation reaction of the alloy and improve the oxidation resistance of the alloy. It is beneficial for alloy applications and hydrogen storage safety.
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2022, Vol. 27 
