Cu3(VO4)2 bimetallic catalyst collaboratively improves the hydrogen storage performance of MgH2

Chao Han, Yang Qin, Huafeng Fu, Jia Hu, Dingfei Zhang, Hansong Xue, Yu'an Chen and Fusheng Pan

Energy, 2025, vol. 329, issue C

Abstract: MgH2 as a solid hydrogen storage substance has wide application prospects in future energy systems. This study investigates the role of Cu3(VO4)2 as a bimetallic catalyst in enhancing the hydrogen storage performance of MgH2. The Cu3(VO4)2 was reduced to Mg2Cu, MgCu2 and VO active sites during hydrogen absorption and release by reaction induction, creating a richer catalytic environment for the system. These active sites play an important role in promoting hydrogen dissociation, binding and diffusion. In particular, the synergistic effect of V species (VO) and Cu species (Mg2Cu, MgCu2) in overcoming the paradoxical relationship between hydrogen dissociation and diffusion. As a result, the MgH2-6wt.%Cu3(VO4)2 composite is capable of liberating 4.3 wt% H2 within 60 min at 200 °C and further releasing 5.3 wt% within 30 min at 220 °C, in addition to absorbing 4.44 wt% H2 within 15 min at 100 °C. After 65 cycles, the hydrogen absorption and desorption amount of MgH2-6wt.%Cu3(VO4)2 composite are 5.67 wt% and 5.6 wt% respectively, with a reversible hydrogen storage capacity preserved at 94 %. This investigation reveals the cooperative catalytic effect of Cu/V bimetallic oxide catalyst on the kinetic attributes of Mg/MgH2, and provides a possibility for developing practical magnesium hydrogen storage materials.

Keywords: Mg/MgH2; Bimetallic oxides; Hydrogen storage; Cyclic performance; Catalytic mechanism (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:329:y:2025:i:c:s0360544225023205

DOI: 10.1016/j.energy.2025.136678

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