EXPLORING THE INFLUENCE OF SINGLE-WALLED CARBON NANOTUBES SUBSTITUTED MG–TI ALLOY FOR HYDRIDING AND DEHYDRIDING PROPERTIES

Abstract

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 8.2x10−3nm−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 °C to 210 °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 cm2s−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.