Enhanced dehydrogenation properties of MgH2by the synergetic effects of transition metal carbides and graphene

Xueqin Zhu; Minjian Yang; Minmin Luo; Yonghong Wang; Hong Li; Juntao Ding; Liqiang Ma

doi:10.1088/1361-6528/acd259

Enhanced dehydrogenation properties of MgH₂by the synergetic effects of transition metal carbides and graphene

Nanotechnology. 2023 May 24;34(32). doi: 10.1088/1361-6528/acd259.

Authors

Xueqin Zhu^{1

2}, Minjian Yang¹, Minmin Luo¹, Yonghong Wang¹, Hong Li¹, Juntao Ding¹, Liqiang Ma²

Affiliations

¹ College of Chemical and Engineering, Guizhou University of Engineering Science, Bijie 551700, People's Republic of China.
² College of Chemical and Environmental Engineering, China University of mining and Technology-Beijing, Beijing 100083, People's Republic of China.

PMID: 37141885
DOI: 10.1088/1361-6528/acd259

Abstract

Transition metal carbides show remarkable catalysis for MgH₂, 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 MgH₂. 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 MgH₂decreases from 128.4 to 111.2 kJ mol^-1. The peak desorption temperature of MgH₂doped 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.

Keywords: TiC; catalysis; graphene; hydrogen storage; magnesium.