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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Adsorption of Pd, Pt, Cu, Ag, and Au Monomers on NiAl(110) Surface: A Comparative Study from DFT Calculations
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Adsorption of Pd, Pt, Cu, Ag, and Au Monomers on NiAl(110) Surface: A Comparative Study from DFT Calculations

机译:NiAl(110)表面上Pd,Pt,Cu,Ag和Au单体的吸附:DFT计算的比较研究

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摘要

First principles calculations based on periodic density functional theory (DFT) have been used to investigate the structural, energetic and electronic properties of different transition metal atoms (Pd, Pt, Cu, Ag, and Au) on the NiAl(110) surface at low coverages (0.08 and 0.25 monolayer). All adatoms prefer to adsorb on 4-fold coordinated sites interacting with two Al and two Ni atoms and forming polar and covalent bonds, respectively. The calculated negative work function changes are explained by the effect of positive surface image created after adsorption, which induces the polarization of the negatively charged adsorbates. Consequently, for metals with similar electronegativity as Ni (Ag and Cu), this polarization effect becomes more significant and leads to larger negative work function changes, but the charge transferred is small.
机译:基于周期性密度泛函理论(DFT)的第一性原理计算已用于研究NiAl(110)表面低温度下不同过渡金属原子(Pd,Pt,Cu,Ag和Au)的结构,能级和电子性质覆盖率(0.08和0.25单层)。所有吸附原子都喜欢吸附在与两个Al和两个Ni原子相互作用并分别形成极性和共价键的4倍配位位点上。计算得出的负功函数变化是由吸附后产生的正表面图像的影响所解释的,这会导致带负电荷的被吸附物极化。因此,对于具有与Ni(Ag和Cu)相似的电负性的金属,这种极化效应变得更加明显,并导致较大的负功函数变化,但转移的电荷很小。

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