Initial stages of Pt(111) electrooxidation: dynamic and structural studies by surface X-ray diffraction
Initial stages of Pt(111) electrooxidation: dynamic and structural studies by surface X-ray diffraction
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DOI：
10.1016/j.electacta.2016.12.028
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发表时间：
2017-01-10
影响因子：
6.6
通讯作者：
Harrington, David A.
中科院分区：
文献类型：
--
作者：
Drnec, Jakub;Ruge, Martin;Harrington, David A.
原位表面X射线衍射用于表征在0.1 M HClO4中的Pt（111）表面上的表面氧化物。在两种电位下的详细分析证实了在氧化初期的表面重构与Pt和O原子之间的位置交换过程一致，并且交换的Pt原子位于它们在Pt（111）晶格中的原始位置之上。在循环伏安法中，（1，1，1.5）反射被用来动态地研究表面。与位置交换相关的重构起始于1.05 V处的CV峰，即使多次循环至1.17 V也不会导致CV发生变化。重组是可逆的地方交换Pt原子，我们估计是0.07和0.15 ML之间的临界覆盖率以下。到高于或等于1.17 V的电位的大量循环导致表面的渐进无序化。(C)2016爱思唯尔有限公司版权所有
In-situ surface X-ray diffraction is used to characterize the surface oxides on a Pt(111) surface in 0.1 M HClO4. Detailed analysis at two potentials confirms that the surface restructuring in the initial oxidation stages is consistent with a place exchange process between Pt and 0 atoms, and the exchanged Pt atoms are located above their original positions in the Pt(111) lattice. The (1,1,1.5) reflection is used to dynamically study the surface during cyclic voltammetry. The restructuring associated with the place exchange initiates with the CV peak at 1.05 V, even though multiple cycles to 1.17 V lead to no changes in the CV. The restructuring is reversible below a critical coverage of place exchanged Pt atoms, which we estimate to be between 0.07 and 0.15 ML. Extensive cycling to potentials higher or equal to 1.17 V leads to progressive disordering of the surface. (C) 2016 Elsevier Ltd. All rights reserved.