Hydrogen storage properties and phase components of Mg doped TiFe alloys, that were prepared by Ti, Fe and Mg metal powders using a mechanical alloying technique, were studied. XRD analyses show that the main phase of...Hydrogen storage properties and phase components of Mg doped TiFe alloys, that were prepared by Ti, Fe and Mg metal powders using a mechanical alloying technique, were studied. XRD analyses show that the main phase of all the Mg doped Ti 1.2 Fe alloys is the TiFe phase. Some TiFe 2 phase and α Ti phase exist as secondary phases and Mg is dispersed in the alloy matrix. 3% Mg doped and 5% Mg doped Ti 1.2 Fe alloy samples can be fully activated within three hydriding/dehydriding cycles at room temperature and the hydrogen storage capacities of the alloys can reach 222 mL/g and 198 mL/g, respectively. Both two samples exhibit only one plateau region in their P C T curves with a low hydrogen absorption/desorption pressure hysteresis. The effect and mechanism of Mg addition as well as overstoichiometric Ti on the activation properties and hydrogen storage capacities of the alloys was also discussed.展开更多
文摘Hydrogen storage properties and phase components of Mg doped TiFe alloys, that were prepared by Ti, Fe and Mg metal powders using a mechanical alloying technique, were studied. XRD analyses show that the main phase of all the Mg doped Ti 1.2 Fe alloys is the TiFe phase. Some TiFe 2 phase and α Ti phase exist as secondary phases and Mg is dispersed in the alloy matrix. 3% Mg doped and 5% Mg doped Ti 1.2 Fe alloy samples can be fully activated within three hydriding/dehydriding cycles at room temperature and the hydrogen storage capacities of the alloys can reach 222 mL/g and 198 mL/g, respectively. Both two samples exhibit only one plateau region in their P C T curves with a low hydrogen absorption/desorption pressure hysteresis. The effect and mechanism of Mg addition as well as overstoichiometric Ti on the activation properties and hydrogen storage capacities of the alloys was also discussed.
