The electrochemical performances of Mg0.9Ti0.1Ni1−xPdx (x = 0–0.15) hydrogen storage electrode alloys

Amorphous hydrogen storage alloys Mg0.9Ti0.1Ni1−xPdx (x = 0–0.15) were prepared by mechanical alloying (MA). The electrochemical performances of electrode alloys were studied by cyclic charge–discharge experiment, linear polarization and electrochemical impedance spectroscopy. The capacity retention rate C20th/Cmax of quaternary Mg0.9Ti0.1Ni1−xPdx (x = 0.05, 0.1, 0.15) alloys are 66.2%, 75% and 76.8%, respectively, much higher than that of Mg0.9Ti0.1Ni (31.4%). It was demonstrated that the substitution of Pd for Ni improved the cyclic stability of MgTiNi-based electrode alloy greatly. The partial substitution of Pd for Ni also led to the increase of exchange current density I0, which concluded that the reaction activity on the surface of alloys was effectively improved.