Xiangyang Zhuang

Electrochemical performances of Mg45M5Co50 (M=Pd, Zr) ternary hydrogen storage electrodes

Abstract In order to improve the discharge capacity and cyclic life of Mg–Co-based alloy, ternary Mg 45 M 5 Co 50 (M=Pd, Zr) alloys were synthesized via mechanical alloying. TEM analysis demonstrates that these alloys all possess body-centered cubic (BCC) phase in nano-crystalline. Electrochemical experiments show that Mg 45 Zr 5 Co 50 electrode exhibits the highest capacity (425 mA·h/g) among the Mg 45 M 5 Co 50 (M=Mg, Pd, Zr) alloys. And Mg 45 Pd 5 Co 50 electrode lifts not only the initial discharge capacity (379 mA·h/g), but also the discharge kinetics, e.g., exchange current density and hydrogen diffusion ability from that of Mg 50 Co 50 . It could be concluded that the electrochemical performances were enhanced by substituting Zr and Pd for Mg in Mg–Co-based alloy.