TY  - JOUR
AU  - Yang, Zexuan
AU  - Ma, Zhendong
AU  - Zou, Yongjin
AU  - Xiang, Cuili
AU  - Sun, Lixian
AU  - Xia, Yongpeng
AU  - Chua, Yong Shen
PY  - 2026
TI  - Preparation of Ni/Ti3O5@graphene oxide double heterojunction for enhancing hydrogen storage in MgH2
JO  - Journal of Magnesium and Alloys
SN  - 2213-9567
VL  - 15
IS  - C
AB  - Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential. However, its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics. In this study, we prepared a Ni/Ti3O5@graphene oxide (GO) dual-heterojunction composite material via solvent heating, electrostatic adsorption, and calcination to improve the hydrogen storage capabilities of MgH2. Adding Ni/Ti3O5@GO to MgH2 lowered the initial dehydrogenation temperature of MgH2 to 183 ℃; at a dehydrogenation temperature of 275 ℃, 6.4 wt.% of H2 escaped from the MgH2 bulk. In addition, the hydrogen storage material absorbed 1.8 wt.% H2 at 30 ℃ for 30 min. The calculated activation energy of dehydrogenation was 48.221 ± 0.141 kJ·mol−1, which was significantly lower than that of the ball-milled MgH2 (112.63 ± 1.44 kJ·mol−1). Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes, resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH2. In this work, we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions.
UR  - https://doi.org/10.1016/j.jma.2025.06.008
DO  - 10.1016/j.jma.2025.06.008