1. Hydrogen adsorption and diffusion on doped Zr(0001) surfaces: A first-principles study.
- Author
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Zhang, Ziyang, Liu, Liming, Xu, Canhui, and Hu, Shuanglin
- Subjects
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DOPING agents (Chemistry) , *ADSORPTION (Chemistry) , *SURFACE diffusion , *HYDROGEN , *SURFACE structure - Abstract
The hydrogen adsorption and diffusion behaviors on the clean and a series of element doped Zr(0001) surfaces are studied through first-principles calculations. Among the studied doping elements, Cu, Co, Y, and Mg prefer to substitute Zr on the topmost surface layer, Al, Pd, Ir, and Si are favored from topmost layer to several surface layers down, while Mo is not favored. Independent of the substitution energies, Mo, Co, and Ir induce a symmetry-breaking local distortion surface structure. Based on the obtained geometries, it is found that most dopants promote the hydrogen adsorption on their next nearest neighbor sites but hinder it on the nearest neighbor sites. Most of the dopants also promote both the hydrogen diffusion on the surface plane and the hydrogen penetration into the subsurface layers. The results indicate that element doping may facilitate the hydride nucleation in Zr alloys. [Display omitted] • Co, Mo and Ir-doping on Zr(0001) surface induce symmetry-breaking local distortion. • Most dopants promote H adsorption on Zr(0001) in their around area. • Most dopants promote both H diffusion on surface and penetration into subsurface. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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