TIMN2-BASED ALLOYS AS HIGH HYDROGEN STORAGE MATERIALS

A series of Ti-Mn multicomponent alloys based on the composition TiMn2 with high hydrogen storage capacity were investigated. It is found th at the alloy Ti0.8Zr0.3Mn1.4Mo0.1V0.2Cr0.2 has a maximum hydrogen capa city of 3.4 H/M (mol H/mol alloy), theoretical electrochemical capacit y of 560 mAh g(-1), exhibits a plateau pressure range between 0.006 an d 0.01 MPa at 293 K. Addition of the elements Si and Al in a four comp onent alloy causes the hydrogen storage capacity to decrease and plate au pressure to increase. Addition of a small amount of Mo increases hy drogen storage capacity. The substitution of V for Mn lowers the plate au pressure dramatically. The phase composition and microstructure of Ti0.8Zr0.3Mn1.4Mo0.1V0.2Cr0.2 which is one of the highest capacity TiM n2- based alloys, had been studied by X-ray diffraction, optical micro scopy and scanning electron microscopy.