Pd capped MgxTi1−x films: Promising anode materials for alkaline secondary batteries with superior discharge capacities and cyclic stabilities

Pd capped MgxTi1−x films have been prepared by magnetron sputtering, and their electrochemical hydrogen storage properties have been investigated. Results show that the Mg0.85Ti0.15 and Mg0.72Ti0.28 samples exhibit the most promising electrochemical properties, including short activation period, large discharge capacities, excellent cyclic stabilities and superior anti-corrosion behaviors. The maximum capacity of Mg0.85Ti0.15 film is achieved to ∼1100 mAh g−1 after 30 cycles, 80% of which (∼810 mAh g−1) can be maintained even after 150 cycles. Such excellent properties make Pd capped MgxTi1−x films competitive candidates as anode materials of alkaline secondary batteries.