Issue 14, 2024

FCC/α-Fe biphasic nano-sites synergize with CNTs to enhance reversible hydrogen storage of MgH2

Abstract

In this study, we successfully synthesized a ternary VTiFe solid solution alloy catalyst via mechanical alloying and strategically integrated it with carbon nanotubes (CNTs) through a two-step ball milling process, aiming to revolutionize the hydrogen storage performance of MgH2. Comprehensive characterization revealed that the VTiFe alloy undergoes a remarkable microstructural evolution during ball milling, leading to the in situ formation of nanoscale FCC and α-Fe biphasic catalytic sites, which synergistically promote the reversible hydrogen storage process in Mg/MgH2. The introduction of CNTs plays a vital role in regulating the surface morphology and aggregation behavior of the composite, facilitating long-range hydrogen diffusion within the material. Benefiting from the synergistic catalytic effects of the VTiFe alloy and CNTs, the MgH2-6 wt% VTiFe-3 wt% CNTs composite achieves impressive hydrogen desorption capacities of 5.0 wt% and 5.5 wt% at 200 °C and 225 °C, respectively, while maintaining exceptional reversibility over 31 cycles. This work provides new insights and experimental evidence for the rational design and performance optimization of Mg-based hydrogen storage materials from the perspective of catalyst microstructure engineering and surface modification.

Graphical abstract: FCC/α-Fe biphasic nano-sites synergize with CNTs to enhance reversible hydrogen storage of MgH2

Supplementary files

Article information

Article type
Research Article
Submitted
30 Apr 2024
Accepted
15 Jun 2024
First published
21 Jun 2024

Inorg. Chem. Front., 2024,11, 4197-4206

FCC/α-Fe biphasic nano-sites synergize with CNTs to enhance reversible hydrogen storage of MgH2

H. Wan, J. Qiu, H. Guan, Z. Ding, Y. Lu, Y. Chen, J. Wang and F. Pan, Inorg. Chem. Front., 2024, 11, 4197 DOI: 10.1039/D4QI01081G

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