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表面非金属掺杂对锐钛矿相TiO2(101) 面吸附NH3特性的影响
The influence of NH3 adsorption anatase TiO2(101) surface doped nonmetal atom properties
摘要点击 94  全文点击 53  投稿时间:2016-09-27  修订日期:2016-10-16
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DOI编号  
中文关键词   密度泛函理论,锐钛矿,表面掺杂,表面吸附
英文关键词   Density Functional Theory, Anatase, Surface doping, Surface Adsorption
基金项目   国家自然科学基金(批准号:61274128);重庆市自然科学基金(批准号:CSTC2013JCYJA0731, CSTC2012JJA50024)重庆市研究生科研创新项目(批准号:CYS15156)和重庆市创新创业训练计划项目(20140637008)
作者单位E-mail
陈小雨 重庆师范大学 413381075@qq.com 
岳远霞 重庆师范大学  
冯庆 重庆市光电功能材料重点实验室  
中文摘要
    采用基于密度泛函理论(DFT-D)体系下的第一性原理平面波超软赝势方法,研究了被不同非金属(B、C、N、F)掺杂的TiO2(101)表面吸附NH3的特性与作用机理。研究发现:被非金属掺杂后的表面对NH3的吸附效果要优于未掺杂表面。不同元素掺杂对比发现:C掺杂后的表面吸附能最大,稳定后吸附距离最小,为最稳定吸附结构。通过Mulliken电荷分布和分态密度的分析,得到了不同吸附条件下NH3在TiO2掺杂表面的催化氧化还原作用机理,并发现各模型吸附能的不同是由于掺杂(X)位原子与NH3分子的相互作用强弱不同所造成。掺杂原子在费米面附近的电子态密度贡献越强,掺杂原子与NH3分子电荷转移的净值越小,吸附距离越小,吸附能越大,吸附更稳定。
英文摘要
    Based on density functional theory(DFT-D) system under the primary principle of plane wave super soft constraint potential method, this paper studied the characteristics and mechanism of the different nonmetal(B,C,N,F) doped titanium dioxide (101) surface adsorbed NH3.Results show that NH3 adsorption effect of the surface doped nonmetal is better than that of a clean surface. The surface doped C is the most stable adsorption structure by comparison with different elements doping. The analysis of Mulliken charge distribution and difference charge density showed the catalytic oxidation mechanism in different TiO2 surface adsorbed NH3。The research found interaction strength between the doping atom and NH3 molecular lead to different adsorption energy. Near the Fermi surface,the greater contribution of the doping atoms to the electronic density of states, the smaller the charge transfer net value of doped atoms and NH3 molecule, the smaller adsorption distance, the greater the adsorption energy, and the adsorption structure is more stable.

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