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Structural and dynamical properties of water adsorption on PtO2(001)

机译:PtO2(001)上水吸附的结构和动力学性质

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The structural, dynamical and electronic properties of water molecules on the β-PtO _(2) (001) surface has been studied using first-principles calculations. For both water monomer and monolayer, the adsorption energies are found to be three to five times larger than that of water adsorption on the Pt surface, and the dissociative adsorption configurations are energetically more stable. The adsorption energies are positively correlated with the charge transfer between the water molecule and the substrate, and the charge-rebalance between the Pt and O atoms of β-PtO _(2) upon water adsorption. More interestingly, an exceptionally large redshift is observed in the OH stretching mode of the adsorbed water monomer, due to the very strong hydrogen bonding with the substrate. The strong water–substrate interactions have significant effects on the molecular orbitals of the chemisorbed water molecules.
机译:使用第一性原理计算研究了β-PtO_(2)(001)表面上水分子的结构,动力学和电子性质。对于水单体和单层而言,发现吸附能比水在Pt表面上的吸附能大三到五倍,并且解离吸附构型在能量上更稳定。吸附能与水分子与底物之间的电荷转移以及水吸附时β-PtO_(2)的Pt和O原子之间的电荷再平衡呈正相关。更有趣的是,由于与基材的非常强的氢键结合,在吸附的水单体的OH拉伸模式下观察到异常大的红移。强烈的水-底物相互作用对化学吸附水分子的分子轨道具有重要影响。

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  • 来源
    《RSC Advances》 |2018年第27期|共9页
  • 作者

    Yong Yang;

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  • 正文语种
  • 中图分类 化学;
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