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Home»News»New method for pinpointing hydrogen isotopes in titanium hydride nanofilms could advance hydrogen storage
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New method for pinpointing hydrogen isotopes in titanium hydride nanofilms could advance hydrogen storage

November 25, 2024No Comments3 Mins Read
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New method for pinpointing hydrogen isotopes in titanium hydride nanofilms could advance hydrogen storage
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Researchers from Institute of Industrial Science, The University of Tokyo have combined techniques to determine the location of hydrogen in titanium hydride nanofilms. Credit: Institute of Industrial Science, The University of Tokyo

Although it is the smallest and lightest atom, hydrogen can have a big impact by infiltrating other materials and affecting their properties, such as superconductivity and metal-insulator-transitions. Now, researchers from Japan have focused on finding an easy way to locate it in nanofilms.

In a study published in Nature Communications, researchers from the Institute of Industrial Science, The University of Tokyo have reported a method for determining the location of hydrogen in nanofilms.

Because they are very small, hydrogen atoms can easily migrate into the framework of other materials. Titanium absorbs hydrogen to give titanium hydrides, making it useful for applications such as hydrogen storage.

Understanding how many hydrogen atoms are present and where exactly they are can provide the key to tuning the properties of the material. However, detecting hydrogen with commonly used techniques—such as electron probes and X-rays—is challenging because of their lack of sensitivity for the small atoms.

The researchers combined two techniques—nuclear reaction analysis (NRA) and ion channeling—to generate two-dimensional angular mapping of titanium hydride nanofilms.

“We took a close look at a TiH1.47 nanofilm,” explains lead author of the study Takahiro Ozawa. “Understanding nanofilms is useful as many hydrogen-related applications involve surface and subsurface reactions. We were able to precisely locate both the hydrogen and deuterium atoms in the nanofilm.”

All the deuterium atoms—an isotope of hydrogen with double its mass—were at locations in the titanium crystal known as tetrahedral positions. However, 11% of the hydrogen atoms present were at sites described as octahedral. Calculations showed that having this variety in the sites lowered the symmetry, which made the lattice more stable.

See also  Researchers demonstrate metasurfaces that control thermal radiation in unprecedented ways

Because the deuterium atoms didn’t occupy octahedral sites because of nuclear quantum effects, controlling the ratio of hydrogen isotopes could be used as a means of tuning the stability and properties of nanofilms based on the intended application.

“Being able to differentiate between the two isotopes in the hydride revealed an opportunity for control,” says Katsuyuki Fukutani, senior author. “This will clearly have important practical applications for producing particular hydrogen-induced phenomena.”

The enhanced understanding of titanium hydride nanofilms is also expected to contribute to hydrogen storage, solid electrolyte, and heterogeneous catalysis applications as we move toward practical and safe green solutions for the future.

Provided by
University of Tokyo



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