Structural and hydrogen storage characterization of nanocrystalline magnesium synthesized by ECAP and catalyzed by different nanotube additives

Abstract Ball-milled nanocrystalline Mg powders catalyzed by TiO 2 powder, titanate nanotubes and carbon were subjected to intense plastic deformation equal-channel angular pressing. Microstructural characteristics of these nanocomposites have been investigated X-ray diffraction. parameters, such as the average crystallite size, dislocation density distance determined modified Williamson–Hall analysis. Complementary hydrogen desorption absorption experiments carried out in a Sieverts’ type apparatus. It was found that Mg-based composite exhibits best overall H-storage performance, reaching 7.1 wt% capacity. The hydrogenation kinetic curves can be fitted contracting volume function for all materials. From it is confirmed nanotube additive results far behavior, including highest hydride front velocity.