Microstructure and electrochemical hydrogen storage characteristics of (La(0.7)Mg(0.3))(1-x)Ce(x)Ni(2.8)Co(0.5) (x=0-0.20) electrode alloys

The microstructure and electrochemical hydrogen storage characteristics of (La(0.7)Mg(0.3))(1-x)Ce(x)Ni(2.8)Co(0.5) (x = 0, 0,05, 0.10, 0.15 and 0.20) alloys have been investigated. The results show that all alloys consist of (La, Mg)Ni(3) and LaNi(5) phases. The cyclic stability (S(100)) of the alloy electrodes increases from 58.7% (x = 0) to 69.8% (x = 0.20) after 100 charge/discharge cycles. The high rate dischargeability (HRD) increases from 66.8% (x = 0) to 69.6% (x = 0.10), then decreases to 65.1% (x = 0.20) at the discharge current density of 1200 mA/g. Moreover, the electrochemical kinetic characteristics of the alloy electrodes are also improved by increasing Ce content. (C) 2010 Professor T. Nejat veziroglu. Published by Elsevier Ltd. All rights reserved