Modification of MgH2 hydrogen storage performance by nickel-based composite catalyst Ni/NiO

Wenxuan Li; Xinglin Yang; Quanhui Hou; Xiaohui Lu; Jie Kong; Jianye Su

doi:10.1016/j.heliyon.2024.e30688

Modification of MgH₂ hydrogen storage performance by nickel-based composite catalyst Ni/NiO

Heliyon. 2024 May 4;10(9):e30688. doi: 10.1016/j.heliyon.2024.e30688. eCollection 2024 May 15.

Authors

Wenxuan Li¹, Xinglin Yang¹, Quanhui Hou², Xiaohui Lu¹, Jie Kong¹, Jianye Su¹

Affiliations

¹ School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, 212003, China.
² School of Automotive Engineering, Yancheng Institute of Technology, Yancheng, 224051, China.

Abstract

In this study, the Ni/NiO catalyst was demonstrated to enhance the hydrogen storage performance of MgH₂. The dehydrogenation of MgH₂+10 wt% Ni/NiO started at approximately 180 °C, achieving 5.83 wt% of dehydrogenation within 10 min at 300 °C. Completely dehydrogenated, MgH₂ began to rehydrogenate at about 50 °C, absorbing about 4.56 wt% of hydrogen in 10 min at 150 °C. In addition, the activation energies of dehydrogenation and rehydrogenation of MgH₂+10 wt% Ni/NiO were 87.21 and 34.84 kJ/mol. During the dehydrogenation/rehydrogenation cycle, Mg₂Ni/Mg₂NiH₄ could promote hydrogen diffusion, thus enhancing the hydrogen storage performance of Mg/MgH₂.

Keywords: Hydrogen storage performance; MgH2; Modification; Ni/NiO.