Comparison between Effective Electrode/Electrolyte Interface Potential and Applied Potential for Gold Electrodes

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• 作者：Patricia Taboada-Serrano ; Viriya Vithayaveroj ; Chia-Hung Hou ; Sotira Yiacoumi ; Costas Tsouris
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2008
• 出版时间：May 21, 2008
• 年：2008
• 卷：47
• 期：10
• 页码：3525 - 3531
• 全文大小：139K
• 年卷期：v.47,no.10(May 21, 2008)
• ISSN：1520-5045

文摘

A nonlinear solution of the Poisson-Boltzmann equation between two interacting surfaces was used to modelthe interaction force between a gold electrode and a standard silicon-nitride cantilever tip employed in atomicforce microscopy (AFM). AFM measurements were used to calculate the effective gold electrode/electrolytesolution interface potential via minimization of the error between predicted interaction force values and thosemeasured via AFM. Analysis of the data reveals that an effective electrode/electrolyte potential, rather thanthe applied potential to the electrode, is responsible for the interaction forces observed in this work. Furtherexamination of the gold electrode/electrolyte interface via cyclic voltammetry reveals that, despite the factthat the gold electrode is considered inert, some degree of association of ions present in the solution with thegold electrode occurs. Accumulation of different ions in the solution at the electrode/electrolyte interfacedetermines the magnitude of the effective potentials at different conditions of pH and ionic strength. Atextreme conditions of pH, electrosorption of ionic species could be detected.