Citation: NING Hua, TAO Xiang-Ming, WANG Mang-Mang, CAI Jian-Qiu, TAN Ming-Qiu. Density Functional Theory Study on Hydrogen Adsorption on Be(0001) Surface[J]. Acta Physico-Chimica Sinica, ;2010, 26(08): 2267-2273. doi: 10.3866/PKU.WHXB20100828 shu

Density Functional Theory Study on Hydrogen Adsorption on Be(0001) Surface

1.
Department of Physics, Zhejiang University, Hangzhou 310027, P. R. China

Received Date: 14 January 2010
Available Online: 28 June 2010
Fund Project: 浙江省教育厅科研项目(Y200804278) (Y200804278)长江学者和创新团队发展计划(IRT0754)资助 (IRT0754)

We report on density functional theory (DFT) total-energy calculations within the generalized gradient approximation for the adsorption of hydrogen onto Be(0001) surface. To investigate the atomic geometries and stability with different hydrogen coverages for this system, we changed the atomic hydrogen coverage from 0.06 to 1.33 monolayer (ML) using various surface supercell geometries. The calculations showed that the adsorption sites have a strong dependence on hydrogen coverage. The adsorbates mainly occupied fcc and hcp hollow sites below 0.67 ML. At 0.78 ML the hydrogen atoms were adsorbed on hollow and bridge sites while for the higher coverage range (ca 0.89-1.00 ML) the hydrogen atoms were adsorbed onto the tilted bridge sites, i.e., a bridge site with a small deviation towards the hollow position. From 1.11 to 1.33 ML, the adsorbed hydrogen atoms were located at hcp and bridge sites, and some Be surface atoms were expanded. All these adsorption configurations were found to be energetically favorable with a H₂ reference point fixed on H2 molecule. Further total-energy calculations based on a p(3×3) geometry did not revealed any stable or energetically favorable adsorption geometry versus the H2 molecule beyond a hydrogen coverage of 1.33 ML.
- Density functional theory,
- Be(0001) surface,
- Hydrogen adsorption,
- Adsorption energy
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