Broader energy distribution of CO adsorbed at polycrystalline Pt electrode in comparison with that at Pt(111) electrode in H2SO4 solution confirmed by potential dependent IR/visible double resonance sum frequency generation spectroscopy
Broader energy distribution of CO adsorbed at polycrystalline Pt electrode in comparison with that at Pt(111) electrode in H2SO4 solution confirmed by potential dependent IR/visible double resonance sum frequency generation spectroscopy
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DOI：
10.1016/j.electacta.2017.03.113
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发表时间：
2017-05
影响因子：
6.6
通讯作者：
Shuo Yang;H. Noguchi;K. Uosaki
中科院分区：
文献类型：
--
作者：
Shuo Yang;H. Noguchi;K. Uosaki
对 H2SO4 溶液中吸附在多晶 Pt 和 Pt(111) 电极上的 CO 进行电化学循环伏安法和电位相关双共振和频发生 (DR-SFG) 光谱，以检查底物对 CO 电子结构的影响。在多晶和单晶 Pt 电极上观察到 SFG 强度对 CO 带顶电位和可见能量的依赖性。 SFG 强度的增强被确定为可见光/SF 光表面电子共振的直接结果，电子从 Pt 的费米能级跃迁到吸附 CO 的 5σa 反键态，这与之前的结果一致。有趣的是，与Pt（111）电极相比，多晶Pt上的强度增强区域的分布宽度比Pt（111）上的更宽。这表明由于多晶Pt电极复杂的表面结构，CO 5σa态的能量分布在多晶Pt表面上比在Pt(111)上更宽。
Electrochemical cyclic voltammetry and potential dependent double resonance sum frequency generation (DR-SFG) spectroscopy were performed on CO adsorbed on polycrystalline Pt and Pt(111) electrodes in H2SO4solution to examine the effect of substrate on the electronic structure of CO. The dependence of SFG intensity on potential and visible energy for atop CO band was observed on both polycrystalline and single crystalline Pt electrodes. Enhancement of the SFG intensity was determined to be a direct result of a surface electronic resonance of the visible/SF light with the electronic transition from Fermi level of Pt to the 5σaanti-bonding state of adsorbed CO, in agreement with previous results. Interestingly, when compared to the Pt(111) electrode, the distribution width of the intensity enhancement region on polycrystalline Pt is broader than on Pt(111). This suggests that the energy distribution of the 5σastate of CO on polycrystalline Pt surface is broader than that on Pt(111) due to the complex surface structure of the polycrystalline Pt electrode.