@article{Wang2026, 
author = {Yazhou Wang and Yongpeng Xia and Enyong Xu and Cuili Xiang and Xue Qing and Zexuan Yang and Fen Xu and Lixian Sun and Yong Shen Chua and Yongjin Zou},
title = {Graphene oxide supported oxygen vacancy-rich Co3O4 and Ni nanoparticle for boosting the hydrogen storage properties of MgH2},
year = {2026},
journal = {Journal of Magnesium and Alloys},
volume = {14},
number = {C},
keywords = {Hydrogen storage, MgH2, Oxygen-vacancy-rich, Catalytic mechanism},
url = {https://www.sciopen.com/article/10.1016/j.jma.2024.12.015},
doi = {10.1016/j.jma.2024.12.015},
abstract = {Developing efficient catalysts is pivotal for advancing MgH2-based hydrogen storage systems. In this study, a novel catalyst, graphene oxide-supported oxygen vacancy-rich Co3O4 and Ni nanoparticles (Ni-OV-C@GO), was synthesized to enhance the hydrogen storage performance of MgH2. The catalyst dramatically improved the kinetics of MgH2, lowering the initial hydrogen desorption temperature of Ni-OV-C@GO-MgH2–7 to 438 K, which is 386 K lower than that of as-milled MgH2. The composite achieved 5.0 wt% hydrogen absorption at 423 K within 600 s and retained 97.3 % capacity after 30 cycles. Notably, the activation energy for H2 desorption was reduced to 40.78 kJ/mol, an 80 % decrease compared to pristine MgH2. The in-situ formation of CoMg2/CoMg2H5 and Mg2Ni/Mg2NiH4 acted as “hydrogen pumps”, facilitating multiple hydrogen transfer pathways. Additionally, oxygen vacancies elongated Mg-H bonds, enhancing dehydrogenation kinetics through catalytic effects. These findings provide valuable insights into improving hydrogen adsorption and desorption kinetics in MgH2-based systems.}
}