Effect of impurities on hydrogen defect stability and migration barrier in yttrium dihydride crystal

Sundar, Aditya; Yu, Jianguo; Cinbiz, M. Nedim

doi:10.1016/j.ijhydene.2024.09.154

Title: Effect of impurities on hydrogen defect stability and migration barrier in yttrium dihydride crystal

Journal Article · 14 October 2024 · International Journal of Hydrogen Energy

DOI: https://doi.org/10.1016/j.ijhydene.2024.09.154 · OSTI ID:2479044

^[1]; Yu, Jianguo ^[2];

^[3]

Argonne National Laboratory (ANL), Argonne, IL (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The impurity or alloying atoms in YH₂ can alter the local electronic structure and so the hydrogen defect stability, as well as the H migration barrier energy. Thus, DFT calculations were employed to determine the effect of foreign elements from alkali and alkaline earth metals to transition metals and one critical impurity element, O, on H vacancy stability and retention characteristics in YH2. Results revealed that alloying elements act as hydrogen vacancy sinks by reducing the vacancy formation energy at neighboring sites. The implantation of non-magnetic foreign elements (s1, s2, and d10 valence electrons) in hydrogen energy landscape was calculated to be minor; while the hydrogen vacancy formation energy was reduced from 1.37 eV to 1.00 eV, the migration energy barrier of hydrogen was increased from 0.87 eV to 1.15 eV for non-magnetic foreign elements. The migration energy barrier monotonically decreased with increasing d-shell occupancy, reaching as low as 0.4 eV for Cr, Mo(d4), and Fe (d4). Alloying with late transition metals (d8 and d9) moderately impacted the hydrogen vacancy formation. Finally, it was found to be O addition into the YH_2- lattice did not alter the energy landscape of hydrogen vacancies. Since alloyed YH₂ has not been studied extensively, this study provides an atomistic understanding how alloying elements and impurities trap vacancies and affects hydrogen mobility YH₂. Meanwhile, the main findings of this study may serve as guidelines for introducing alloying elements in ZrH₂ as well.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725; AC07-05ID14517

OSTI ID:: 2479044

Journal Information:: International Journal of Hydrogen Energy, Journal Name: International Journal of Hydrogen Energy Vol. 91; ISSN 0360-3199

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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