Electrochemical hydrogen storage properties of Ti2Ni alloy prepared by mechanical alloying

The nominal composition of the Ti₂Ni alloy was synthesized, under argon atmosphere and at room temperature, using a planetary high-energy ball mill. The effect of the temperature on the hydrogen storage properties of this alloy was studied using different electrochemical techniques. The electrochemical cycling results show that the maximum discharge capacity was obtained after only one cycle independently of the temperature. The loss of the capacity became more important with temperature. The activation energy of Ti₂Ni alloy, prepared by mechanical alloying for a milling time of 60h, is estimated to be equal to 8 kJ mol^-1. This obtained value is slightly less than that found for the same alloy prepared by magnetic induction melting.