Enhanced dehydrogenation properties of MgH <sub>2</sub> by the synergetic effects of transition metal carbides and graphene
Xueqin Zhu, Minjian Yang, Minmin Luo, Yonghong Wang, Hong Li, Juntao Ding, Liqiang Ma
Abstract
Abstract Transition metal carbides show remarkable catalysis for MgH 2 , and the addition of carbon materials can attach excellent cycling stability. In this paper, Mg-doped with transition metal carbides (TiC) and graphene (G) composite (denoted as Mg–TiC–G) is designed to assess the influence of TiC and graphene on the hydrogen storage performance of MgH 2 . The as-prepared Mg–TiC–G samples showed favorable dehydrogenation kinetics compared to the pristine Mg system. After adding TiC and graphene, the dehydrogenation activation energy of MgH 2 decreases from 128.4 to 111.2 kJ mol −1 . The peak desorption temperature of MgH 2 doped with TiC and graphene is 326.5 °C, which is 26.3 °C lower than the pure Mg. The improved dehydrogenation performance of Mg–TiC–G composites is attributed to synergistic effects between catalysis and confinement.