Preparation of hydrogen storage alloys for applications of hydrogen storage and transportation

摘要

This paper investigates the composition design and processing of hydrogen storage alloys (HSA) for H_2 storage and transportation (S&T) applications. A series of Lm(NiX)_5 intermetallic alloys were designed and prepared, where Lm indicates La-rich mischmetal, and X represents the metallic additives for improving hydrogen capacity and plateau pressure at various temperatures. PCT properties showed that Lm(Ni_(1-x)Mo_x)_5 intermetallics were among the best, x being in the range 0.01-9.1; the H_2 absorption capacity could extend to 1.7 wt. percent without increasing plateau-slope. The processing improvement, a synthesizing technique based on the SMQ process, was established which allowed the segregation control and inhibited second-phase transformation, thus avoiding formation of a plateau-slope.