Catalytic Oxygen Activation on Helical Gold Nanowires

Catalytic Oxygen Activation on Helical Gold Nanowires
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螺旋金纳米线上的催化氧活化

DOI:
10.1021/jp302865z
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发表时间:
2012-05
影响因子:
3.7
通讯作者:
Chen, Liang
Chen, Liang
中科院分区:
化学3区
文献类型:
--
作者:
Yang, Jianhui;Li, Bo;Zhang, Qiuju;Yim, Wai-leung;Chen, Liang

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用第一性原理密度泛函方法(DFT)研究了一维金纳米管T(6,0)和纳米线W6-1上的氧活化。结果表明,氧在T(6,0)上的吸附强度出乎意料地弱,而内含Au-Au键的W6-1对O2的吸附活性更高。为了进一步促进催化氧活化,我们提出并评估了两种工作策略,包括沿轴向施加小应变和掺杂外来过渡金属(TM)原子。具体来说,4%的压缩或掺杂铂原子可以将O2的离解势垒从0.85 eV降低到更理想的0.6 eV。电子结构和电荷密度差分析表明,Au-Tm内键降低了Au-dz2轨道的填充度,从而提高了氧的活性。
Oxygen activation on one-dimensional (1D) gold nanotube T(6,0) and nanowire W6-1 was investigated using first principles density functional methods (DFT). It is found that the oxygen adsorption strength on T(6,0) is unexpectedly weak, whereas W6-1 with inner Au–Au bonds is more active for O2 adsorption. To further promote the catalyzed oxygen activation, we proposed and evaluated two working strategies, including imposing a small strain along the axial direction and doping alien transition metal (TM) atoms. Specifically, 4% compression or doping Pt atoms can decrease the O2 dissociation barriers from 0.85 eV to a more desired 0.6 eV. The analysis of electronic structures and charge density difference revealed that the inner Au–TM bond can decrease the filling degree of the Au-dz2 orbital and, thus, improve the oxygen activity.
DOI: 10.1002/chin.200701227
发表时间: 2007-01
期刊: ChemInform
影响因子: --
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