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首页> 外文期刊>Journal of the Brazilian Chemical Society >A microgravimetric study of simultaneous adsorption of anions and copper on polycrystalline Pt surfaces
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A microgravimetric study of simultaneous adsorption of anions and copper on polycrystalline Pt surfaces

机译：同时在多晶Pt表面同时吸附阴离子和铜的微重力研究

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The underpotential deposition of Cu was studied in four different acid electrolytes by simultaneous measurements of cyclic voltammetry and microgravimetry using a electrochemical quartz crystal microbalance. The influence of anions on the Cu monolayer was determined. Among the three desorption peaks observed, the first was found to be very sensitive to the nature of the anion present in solution. This was related to the low coverage of the Pt surface by ad-atoms, in the respective potential range, which yields a weak interaction between the Cu ad-atoms. The monolayer is composed of a first layer of Cu adsorbed on Pt and a second layer of anions adsorbed on the Cu ad-atoms, with each anion occupying two adjacent Cu atoms, with the exception of the Cl- anion which was deposited on only one Cu ad-atom. This structure consequently forms a bi-layer deposit. The modification of voltammetric and massogram profiles by adding Cl- to the perchlorate electrolyte was also analyzed.
机译：通过同时测量循环伏安法和微重力法（使用电化学石英晶体微量天平），研究了在四种不同酸性电解液中Cu的欠电位沉积。确定了阴离子对Cu单层的影响。在观察到的三个解吸峰中，第一个对溶液中阴离子的性质非常敏感。这与在各个电势范围内吸附原子对Pt表面的覆盖率低有关，这导致Cu吸附原子之间的相互作用较弱。单层由吸附在Pt上的第一层Cu和吸附在Cu原子上的第二层阴离子组成，每个阴离子占据两个相邻的Cu原子，Cl-阴离子仅沉积在一个铜原子。因此，该结构形成双层沉积。还分析了通过向高氯酸盐电解质中添加Cl-对伏安和质谱图轮廓的修改。

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