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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >Adsorption kinetics of uracil on bismuth single crystal planes
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Adsorption kinetics of uracil on bismuth single crystal planes

机译：尿嘧啶在铋单晶面上的吸附动力学

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摘要

The electrochemical impedance method has been used for the quantitative study of uracil adorption kinetics at the bismuth single crystal plane|aqueous Na_2SO_4 solution interface. Analysis of impedance data demonstrates that the adsorption process of uracil is complicated and limited by the mixed kinetics, i.e. by the slow adsorption and diffusion steps. Analysis of the Cole-Cole and other dependences indicates that, at small frequencies and higher uracil concentrations, two-dimensional association of the uracil molecules is possible. Nonlinear regression analysis has been used for fitting the experimental complex plane (Z",Z') plots. The classical Frumkin-Melik-Gaikazyan circuit in the region of higher ac frequencies and lower uracil concentrations (c_(uracil) ≤ 2 * 10~(-3) M), and the modified Frumkin-Melik-Gaikazyan equivalent circuit (taking into account the inhomogeneous semi-infinite diffusion) at c_(uracil) ≥ 2 * 10~(-3) M fit with a reasonable accuracy the experimental Z", Z'-plots. It was found that the values of the double layer capacitance, partial charge transfer resistance, adsorption capacitance and Warburg-like diffusion impedance depend noticeably on the electrode potential and concentration of uracil. Other more complicated equivalent circuits have been used to fitting the experimental impedance data.
机译：在铋单晶Na_2SO_4溶液界面处的尿嘧啶吸附动力学的定量研究已使用电化学阻抗法。阻抗数据的分析表明，尿嘧啶的吸附过程复杂且受混合动力学的限制，即受缓慢的吸附和扩散步骤的限制。对Cole-Cole和其他相关性的分析表明，在低频和较高的尿嘧啶浓度下，尿嘧啶分子的二维关联是可能的。非线性回归分析已用于拟合实验复杂平面（Z“，Z'）图。在较高交流频率和较低尿嘧啶浓度（c_（uracil）≤2 * 10〜）的区域中，经典Frumkin-Melik-Gaikazyan电路（-3）M），并且在c_（尿嘧啶）≥2 * 10〜（-3）M时，经过改进的Frumkin-Melik-Gaikazyan等效电路（考虑了不均匀的半无限扩散）以合理的精度拟合了实验Z”，Z'-图。发现双层电容，部分电荷转移电阻，吸附电容和类似Warburg的扩散阻抗的值明显取决于电极电势和尿嘧啶的浓度。其他更复杂的等效电路已用于拟合实验阻抗数据。

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