In Situ STM Observation of Stable Dislocation Networks during the Initial Stages of the Lifting of the Reconstruction on Au(111) Electrodes
In Situ STM Observation of Stable Dislocation Networks during the Initial Stages of the Lifting of the Reconstruction on Au(111) Electrodes
复制标题
Au(111)电极重构提升初期稳定位错网络的原位STM观测
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Á. Cuesta
中科院分区：
文献类型：
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作者：
Cristina Vaz;A. Aranzabal;Á. Cuesta
在−5和28 μC cm−2之间的表面电荷密度范围内，并且与支持电解质无关，Au（111）电极的表面显示出不同于阱-已知的表面重建和未重建状态，显然仅由fcc区域和比重建表面上观察到的更宽的位错组成，并且排列在遵循三个主要的旋转域中衬底的晶轴。位错的尺寸随着正电荷的增加而增加，最大可达28 μC cm−2。在较高的电荷密度下，形成未重构的表面，由小的三角形岛覆盖，容纳重构表面中存在的4 - 5%的多余原子。我们的研究结果表明，提升的重建是由表面上的正电荷，而不是由专门吸附的阴离子。
In a surface charge density range between −5 and 28 μC cm−2, and independent of the support electrolyte, the surface of a Au(111) electrode shows a morphology that differs from both the well-known surface reconstruction and the unreconstructed state and is apparently composed only of fcc regions and dislocations wider than those observed on the reconstructed surface and arranged in rotational domains that follow the three main crystallographic axes of the substrate. The size of the dislocations increases with the positive charge up to 28 μC cm−2. At higher charge densities, the unreconstructed surface, covered by small triangular islands accommodating the 4−5% excess atoms present in the reconstructed surface, is formed. Our results demonstrate that lifting of the reconstruction is induced by the positive charge on the surface and not by specifically adsorbed anions.