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Dissociations of O2 molecules on ultrathin Pb(111) films: first-principles plane wave calculations |
Hu Zi-Yu(胡自玉)a)b), Yang Yu(杨宇)b), Sun Bo(孙博)b), Zhang Ping(张平)b)†, Wang Wen-Chuan(汪文川)a), and Shao Xiao-Hong(邵晓红)a)‡ |
a Laboratory of Molecular and Materials Simulation, Key Laboratory for Nanomaterials of Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China; b Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China |
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Abstract Using first-principles calculations, we systematically study the dissociations of O2 molecules on different ultrathin Pb(111) films. According to our previous work revealing the molecular adsorption precursor states for O2, we further explore why there are two nearly degenerate adsorption states on Pb(111) ultrathin films, but no precursor adsorption states existing at all on Mg(0001) and Al(111) surfaces. The reason is concluded to be the different surface electronic structures. For the O2 dissociation, we consider both the reaction channels from gas-like and molecularly adsorbed O2 molecules. We find that the energy barrier for O2 dissociation from the molecular adsorption precursor states is always smaller than that from O2 gas. The most energetically favorable dissociation process is found to be the same on different Pb(111) films, and the energy barriers are found to be influenced by the quantum size effects of Pb(111) films.
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Received: 02 June 2011
Revised: 11 August 2011
Accepted manuscript online:
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PACS:
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68.43.Bc
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(Ab initio calculations of adsorbate structure and reactions)
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68.43.Fg
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(Adsorbate structure (binding sites, geometry))
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73.20.Hb
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(Impurity and defect levels; energy states of adsorbed species)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 90921003, 10904004 and 60776063) and the Fundamental Research Funds for the Central Universities, China (Grant No. JD1109). |
Cite this article:
Hu Zi-Yu(胡自玉), Yang Yu(杨宇), Sun Bo(孙博), Zhang Ping(张平), Wang Wen-Chuan(汪文川), and Shao Xiao-Hong(邵晓红) Dissociations of O2 molecules on ultrathin Pb(111) films: first-principles plane wave calculations 2012 Chin. Phys. B 21 016801
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