Hydrogen activation, storage properties and associated crystal structures of Ti_1-xSc_xMn_1.6V_0.4 (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) alloys are investigated by hydrogenation and XRD. The unit-cells of alloys and hydrides expand with Sc content and hydrogen concentration. Minor addition of Sc significantly improves hydrogen activation and storage properties. The plateau pressure decreases, whereas the sloping factor and relative partial molar enthalpy for hydrogenation increase with Sc content. The activation properties strongly depend on the particle sizes. The bulk samples can easily be activated by implementing a hydrogen-induced cracking mechanism, which avoids removal of protective oxide films and compensates the lack of metallic B-metal in catalysis of hydrogen dissociation. Samples with smaller particle sizes are difficult to activate. The unusual particle size effect is interpreted by activation kinetics, and attributed to the high oxygen binding ability of B-metals and their contribution to the surface oxide films.

Ti _{1- x} Sc _x Mn _1.6 V _0.4 ( x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) 合金通过氢化和 XRD 进行研究。合金和氢化物的晶胞随着 Sc 含量和氢浓度的增加而膨胀。少量添加 Sc 显着提高了氢的活化和存储性能。平台压力降低，而氢化的倾斜因子和相对偏摩尔焓随着Sc含量的增加而增加。活化特性强烈依赖于粒径。通过实施氢致裂化机制，可以轻松地激活大块样品，这避免了保护性氧化膜的去除，并弥补了氢解离催化中金属 B 金属的缺乏。粒径较小的样品难以活化。不寻常的粒径效应是通过活化动力学来解释的，