The electrochemical behaviors of Mg-8Li-0.5Y and Mg-8Li-1Y alloys in sodium chloride solution

The electrochemical performances of Mg-8Li-0.5Y and Mg-8Li-1Y electrodes in 0.7 mol L-1 NaCl solution are investigated by methods of potentiodynamic polarization, electrochemical impedance spectroscopy, potentiostatic oxidation and scanning electron microscopy (SEM). Their performances as anodes of Mg-H2O2 semi-fuel cells are also determined. It is found that the Mg-8Li-1Y electrode has higher corrosion resistant ability and electrooxidation activity than that of Mg-8Li-0.5Y electrode in 0.7 mol L-1 NaCl solution. The corrosion potential of Mg-8Li-1Y electrode is 60 mV more positive than that of Mg-8Li-0.5Y electrode. The current density of Mg-8Li-1Y electrode is around 2 mA cm(-2) higher than that of Mg-8Li-0.5Y electrode at the discharge potentials of -0.8 V, -1.0 V and -1.2 V, and it is similar to that of Mg-8Li-0.5Y electrode at -1.4 V. The Mg-H2O2 semi-fuel cell with Mg-8Li-1Y anode presents a maximum power density of 59 mW cm(-2) at room temperature, which is higher than that of Mg-8Li-0.5Y anode (53 mW cm(-2)). The content of Y in alloys obviously affects the performance of the alloys and the Y content of 1 wt. % is better than 0.5 wt. %. (C) 2013 Elsevier B.V. All rights reserved.