Crystal Symmetry Governs Quantum Tunneling for Tunable Solid-State Hydrogen Storage in Vanadium

When it comes to hydrogen as a zero-emission energy carrier, a big part of the puzzle is figuring out how to store it safely while still allowing for quick charging and discharging. Researchers from the Institute of Industrial Science at the University of Tokyo have discovered something pretty intriguing: a basic property called crystal symmetry can actually toggle how hydrogen atoms behave in vanadium metal. This breakthrough could pave the way for better solid-state hydrogen storage—an essential piece of the puzzle for our future hydrogen infrastructure.

Quantum vs Classical Transport: The Core Discovery

The team at IIS, led by research associate Takahiro Ozawa and professor Katsuyuki Fukutani, dug deep into how hydrogen behaves in vanadium lattices. By blending precise diffusion measurements with quantum mechanical calculations, they explored what happens when hydrogen is introduced to vanadium. At low concentrations, the vanadium lattice maintains a high level of symmetry, allowing hydrogen atoms to act like delocalized waves that can tunnel through barriers effortlessly. But as hydrogen concentration increases, the lattice gets distorted, which disrupts this symmetry and makes hydrogen revert to classical, thermally activated hopping. Instead of tunneling through barriers, they're now climbing over them—talk about a dramatic change!

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