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The LaMgNi4-xCox (x = 0,0.4) alloys have been prepared by induction melting and the phase compositions and structures were characterized via X-ray diffraction (XRD) and scanning electron microscope (SEM).The results show that the alloys have a multiphase structure,composing of two main phases LaMgNi4 and LaNi5.The gaseous and electrochemical hydrogen storage properties of the alloys were investigated.