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Au_(38)团簇上小分子H_2O和O_2共同吸附的第一性原理研究

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Indexed by:期刊论文

Date of Publication:2010-02-28

Journal:原子与分子物理学报

Included Journals:PKU、ISTIC、CSCD

Volume:27

Issue:1

Page Number:69-75

ISSN No.:1000-0364

Key Words:Au38团簇;密度泛函理论(DFT);共吸附;晶面

Abstract:利用密度泛函理论(DFT)计算的方法,对O_2,H_2O单独吸附[1]和共吸附在Au_(38) 团簇上的吸附性质进行了结构,能量和电子分析.计算结果表明,O_2倾向于吸附在edge位,H_2O则倾向于吸附在top位.Au(100)表面较之Au (111)表面更有利于O_2,H_2O的吸附,这与实验结果相符合.H_2O和O_2共吸附研究表明,H2O的存在促进了O_2的吸附.Mulliken和分态密度(PDOS)分析得出:在共吸附中,H_2O将部分电子转移给了O_2,促进了O_2的活化与解离,并生成了类似H_2O_2的中间态,从而为催化氧化反应提供了O活性物种.

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