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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Theoretical Calculations on the Oxidation of CO on Au_(55)/ Ag_(13)Au Au_(13)Ag_(42), and Ag_(55) Clusters of Nanometer Size
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Theoretical Calculations on the Oxidation of CO on Au_(55)/ Ag_(13)Au Au_(13)Ag_(42), and Ag_(55) Clusters of Nanometer Size

机译:纳米尺寸Au_(55)/ Ag_(13)Au Au_(13)Ag_(42)和Ag_(55)团簇上CO氧化的理论计算

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Using density-functional theory (DFT), we investigated the oxidation of CO on Au_(55), Ag_(13)Au_(42), Au_(13)Ag_(42). and Ag_(55) metal clusters of nm size. The structures of oxidation intermediates and at the transition states on the potential-energy surfaces were derived with the nudged-elastic-band (NEB) method. According to our results, the coupling of CO and O2 molecules to form intermediate OCOO has the least energy barrier (0._(13) eV) on the Ag_(13)Au_(42) core—shell nanocluster, whereas the dissociation of the O— O bond of OCOO to form CO2 and O on the Au_(13)Ag_(42) core—shell nanocluster is the easiest process with a 0.15 eV barrier height. To understand the electronic property of these nanocluster catalysts and their interactions with the adsorbates, we calculated the electron localization functions, Bader charges, and local densities of states; the results were consistent and explicable.
机译:使用密度泛函理论(DFT),我们研究了CO在Au_(55),Ag_(13)Au_(42),Au_(13)Ag_(42)上的氧化。和Ag_(55)纳米尺寸的金属簇。用微带弹性带(NEB)方法推导了氧化中间产物的结构以及在势能表面上的过渡态。根据我们的结果,CO和O2分子偶联形成中间体OCOO在Ag_(13)Au_(42)核-壳纳米簇上的能垒最小(0 ._(13)eV),而OCOO的O-O键在Au_(13)Ag_(42)核-壳纳米簇上形成CO2和O的过程最简单,势垒高度为0.15 eV。为了了解这些纳米簇催化剂的电子性质及其与被吸附物的相互作用,我们计算了电子的局部化功能,巴德电荷和态的局部密度。结果是一致的和可解释的。

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