@article{Lv2026, 
author = {Cheng Lv and Qingjie He and Yongjin Zou and Ruoyang Zhang and Hanjie Wen and Jiayan Huang and Jing Zhi and Cuili Xiang and Lixian Sun and Yong Shen Chua},
title = {Improving the hydrogen storage performance of MgH2 by compositing with Ce/N–codoped TiO2},
year = {2026},
journal = {Journal of Magnesium and Alloys},
volume = {18},
number = {C},
keywords = {Oxygen vacancy, Magnesium hydride, Hydrogen storage, Cerium/nitrogen–codoped titania},
url = {https://www.sciopen.com/article/10.1016/j.jma.2025.11.010},
doi = {10.1016/j.jma.2025.11.010},
abstract = {MgH2 shows promise for solid-state hydrogen storage because of its high gravimetric capacity (7.6%) and ecofriendliness but cannot be easily commercialized because of its sluggish dehydrogenation/rehydrogenation kinetics and high thermodynamic stability. Herein, Ce/N–codoped TiO2 (CN-T) synthesized using a solvothermal/calcination method was composited with MgH2 to enhance its hydrogen storage performance. The composite with a CN-T loading of 7 wt% started releasing H2 at 187.2 ℃ and released 6.45 wt.% H2 in 180 s at 301 ℃, which corresponded to nearly complete dehydrogenation. The residue could be rapidly rehydrogenated, with hydrogen contents of 3.24 and 5.45 wt% achieved in 1 min at 100 ℃/20 bar H2 and 5 min at 200 ℃/20 bar H2, respectively. This performance enhancement was attributed to the combined effects of doped N, multivalent Ti, and Ce. The doped N weakened Mg–H bonds via charge transfer and modified the electronic state density of MgH2. Ti catalyzed H2 dissociation/recombination through dynamic valence cycling and D-electron injection, and the introduction of Ce3+ created O vacancies, which lowered the electron density of Mg–H bonds, generated strain fields for hydrogen release, provided diffusion pathways, and introduced bandgap states to strengthen electron–hydrogen coupling. Thus, this study paves the way for the commercialization of MgH2 as a green high-capacity hydrogen carrier for diverse applications.}
}