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A General Approach Based on Sampled‐Current Voltammetry for Minimizing Electrode Fouling in Electroanalytical Detection
ChemElectroChem ( IF 3.5 ) Pub Date : 2017-11-13 , DOI: 10.1002/celc.201700884 Isabelle Mazerie 1 , Pierre Didier 2 , Florence Razan 2 , Philippe Hapiot 1 , Nathalie Coulon 3 , Aurélie Girard 4 , Olivier de Sagazan 3 , Didier Floner 1 , Florence Geneste 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2017-11-13 , DOI: 10.1002/celc.201700884 Isabelle Mazerie 1 , Pierre Didier 2 , Florence Razan 2 , Philippe Hapiot 1 , Nathalie Coulon 3 , Aurélie Girard 4 , Olivier de Sagazan 3 , Didier Floner 1 , Florence Geneste 1
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Electrochemical analysis of species known to passivate electrode surfaces remains challenging. We previously proposed a new method, dealing with sampled‐current voltammetry performed on an electrode array to mimic polarography at a dropping mercury electrode for the detection of copper. In this work, we study the effectiveness of this method to circumvent electrode fouling with the analysis of phenol solutions at high concentrations (10−2 mol L−1), known to polymerize on electrode surface during its oxidation. Electrode arrays well‐adapted to the analysis with such system are prepared by photolithography and characterized by X‐ray photoelectron spectroscopy, X‐ray diffraction, and voltammetry. Although analyses performed in conventional linear voltammetry or sampled‐current voltammetry on a single electrode are considerably affected by electrode fouling, a linear calibration plot was achievable using our method. Modeling of the electrochemical signal showed that the current depends only on the applied potential and a parameter characteristic of the passivation phenomenon. It also underlined that sampled‐current voltammetry on an electrode array can circumvent the problem of passivation by a judicious choice of the sampling time.
中文翻译：
基于采样电流伏安法的最小化电分析检测中电极污染的通用方法
对已知能钝化电极表面的物质进行电化学分析仍然具有挑战性。我们先前提出了一种新方法，该方法涉及在电极阵列上执行的采样电流伏安法，以模拟在滴下的汞电极上的极谱法，以检测铜。在这项工作中，我们通过分析高浓度（10 -2 mol L -1的苯酚溶液）来研究该方法避免电极结垢的有效性。），已知在氧化过程中会在电极表面聚合。通过光刻法制备了非常适合于这种系统分析的电极阵列，并通过X射线光电子能谱，X射线衍射和伏安法对其进行了表征。尽管传统的线性伏安法或采样电流伏安法对单个电极进行的分析受电极结垢的影响很大，但使用我们的方法仍可得到线性校准图。电化学信号的建模表明，电流仅取决于施加的电势和钝化现象的参数特征。它还强调指出，通过明智地选择采样时间，电极阵列上的采样电流伏安法可以避免钝化问题。
更新日期：2017-11-13
中文翻译：
基于采样电流伏安法的最小化电分析检测中电极污染的通用方法
对已知能钝化电极表面的物质进行电化学分析仍然具有挑战性。我们先前提出了一种新方法，该方法涉及在电极阵列上执行的采样电流伏安法，以模拟在滴下的汞电极上的极谱法，以检测铜。在这项工作中，我们通过分析高浓度（10 -2 mol L -1的苯酚溶液）来研究该方法避免电极结垢的有效性。），已知在氧化过程中会在电极表面聚合。通过光刻法制备了非常适合于这种系统分析的电极阵列，并通过X射线光电子能谱，X射线衍射和伏安法对其进行了表征。尽管传统的线性伏安法或采样电流伏安法对单个电极进行的分析受电极结垢的影响很大，但使用我们的方法仍可得到线性校准图。电化学信号的建模表明，电流仅取决于施加的电势和钝化现象的参数特征。它还强调指出，通过明智地选择采样时间，电极阵列上的采样电流伏安法可以避免钝化问题。
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