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Vanadium Oxide Interface Modification: Improving the Cycling Endurance of Hydrogen Storage Materials

The cyclic degradation problem of hydrogen storage materials can be effectively addressed through vanadium oxide interface modification technology. Vanadium oxide forms a stable protective layer on the material surface, preventing oxidation of active components while not hindering the migration and diffusion of hydrogen atoms.

Research has shown that hydrogen storage materials modified with vanadium oxide reduce the surface hydrogen dissociation energy by 30% while also suppressing particle agglomeration and pulverization. In cycling tests at 325°C, the unmodified sample exhibited a 20% capacity degradation after 10 cycles, while the vanadium oxide-modified sample exhibited only a 2.5% degradation after 30 cycles. This modification technique can also reduce the material's activation energy. For example, the addition of vanadium oxide to a magnesium-based material reduced the dehydrogenation activation energy from 118.6 kJ/mol to 69.6 kJ/mol, a 41% reduction. This characteristic of vanadium oxide makes hydrogen storage materials more practical for long-term service scenarios, such as stationary energy storage.