Exploring the influence of Single-Walled carbon nanotubes substituted Mg-Ti alloy for hydriding and dehydriding properties

Currently, researchers are giving much more attention to carbon allotropes for hydrogen storage applications. SWCNT-(Mg-Ti) composites have been synthesized by the ball milling technique. The XRD patterns confirmed the solid solution formation of Ti in Mg. The substitution of SWCNT in Mg-Ti intermetallic alloy increases the dislocation density to 8.2x10(-3)nm(-2) and reduces the crystal size from 46 to 28 nm and lattice strain of 0.54 to 0.28 %. The Raman analysis confirmed the existence of SWCNTs by presenting D and G bands and also confirmed the vibrations of Mg-Ti alloy. After the substitution of SWCNT, the exothermic peak reduced from 232 degrees C to 210 degrees C. The activation energy is also reduced after the substitution of SWCNT; it drastically reduces the activation energy to 66.59 kJ/mol for Mg67Ti29SWCNT4 alloy among the prepared samples. The impedance spectroscopy shows a higher diffusion coefficient of 5.2488x10(-11) cm(2)s(-1) for SWCNT substituted Mg-Ti alloy compared to pristine alloy. The hydriding/dehydriding studies were observed on the developed electrode material and Mg67Ti29SWCNT4 delivered a maximum storage capacity of 826 mAhg(-1).