Adsorption, surface relaxation and electrolyte structure at Pt(111) electrodes in non-aqueous and aqueous acetonitrile electrolytes.

Adsorption, surface relaxation and electrolyte structure at Pt(111) electrodes in non-aqueous and aqueous acetonitrile electrolytes.
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非水和水性乙腈电解质中 Pt(111) 电极的吸附、表面弛豫和电解质结构。

DOI:
10.1039/c9cp00499h
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发表时间:
2019
期刊:
PCCP
影响因子:
--
通讯作者:
Harlow GS
Harlow GS
中科院分区:
--
文献类型:
--
作者:
Harlow GS

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采用原位电化学表面x射线衍射研究了电位控制下非水和水乙腈电解质中电化学双层的原子尺度结构和Pt(111)电极表面的弛豫。x射线测量通过结合动电位测量(x射线伏安法)和恒电位测量(晶体截断棒数据)来探测界面的金属和电解质两侧,从而深入了解界面结构的电位依赖性。晶体截断棒的测量结果与在没有水的情况下乙腈的电位依赖重定向和在有水的情况下的平行排列一致。随着乙腈浓度的增加,最靠近电极表面的电子密度也增加。最后,从电化学双层结构的角度讨论了铂在一系列水和非水溶剂中的表面弛豫。
In situ electrochemical surface X-ray diffraction was employed to investigate the atomic scale structure of the electrochemical double layer and the relaxation at the Pt(111) electrode surface in non-aqueous and aqueous acetonitrile electrolytes under potential control. The X-ray measurements provide insight into the potential-dependence of the interface structure by combining potentiodynamic measurements (X-ray voltammetry) with potentiostatic measurements (crystal truncation rod data) to probe both the metal and electrolyte sides of the interface. The crystal truncation rod measurements are consistent with the potential dependent reorientation of acetonitrile in the absence of water and a parallel arrangement in the presence of water. As acetonitrile concentration increases, the electron density closest to the electrode surface also increases. Finally, Pt surface relaxation in a range of aqueous and non-aqueous solvents is discussed in general with regards to the structure of the electrochemical double layer.
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