Influence of Mn on phase structures and electrochemical properties of V3TiNi0.56Hf0.24 alloy

The influence of the addition of Mn on the phase structures and the electro chemical properties of V3TiNi0.56Hf0.24 alloy has been studied. It is found that adding Mn does not change the structures of the main phase and the se condary phase but changes the lattice parameters, composition and molar fra ction of each phase in different degrees. In V(3)TiNi(0.56)Hf(0.24)Mnx, the maximum hydrogen desorption capacity decreases while the cycle life of the alloy electrode does not change significantly with increasing Mn content. However, it is interesting to note that with x = 0.15 the best high rate ca pability is obtained. (C) 2000 International Association for Hydrogen Energ y. Published by Elsevier Science Ltd. All rights reserved.