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The partitioning mechanism of phenazine ethosulfate into polymer film electrodes

机译：吩嗪乙醇硫酸盐在聚合物膜电极中的分配机理

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Phenazine ethosulfate (PES+) partitioning into the AQ55 cation-exchange polymer has been demonstrated by immersion and continuous electrochemical cycling experiments. Cyclic voltammetric waveshapes indicate that both the reduction of PES+ and the oxidation of PESH are diffusion-controlled when incorporated into the polymer film. This is in dramatic contrast to the behavior exhibited at bare glassy carbon where the reduction of PES+ is diffusion-controlled but the oxidation of PESH is characteristic of a surface-confined redox process. The straightforward determination of the partition coefficient is complicated by the uncertainty associated with accurately knowing the thickness of the swollen polymer. Therefore Randles-Sevcik data for the reduction of PES+ at the bare and polymer-modified electrode were compared to qualitatively assess the extent of possible partitioning, which was determined to be on the order of 10(1) - 10(2). The partition coefficient was determined to be 9.1 +/- 0.4, a value in agreement with qualitative assessment. Partitioning was found to be sensitive to the cations present in solution with the order of extractability of PES+ from solutions of Li+, Na+, and K+, increasing in the order: Li+ > Na+ > K+. Continuous cycling experiments suggest PES+ partitions into the film during the reductive cycle to restore the equilibrium concentration in the film caused by the electrochemical consumption of the species.
机译：已通过浸没和连续电化学循环实验证明了吩嗪乙硫酸盐（PES +）分配到AQ55阳离子交换聚合物中。循环伏安波形表明，当掺入聚合物薄膜时，PES +的还原和PESH的氧化均受扩散控制。这与在裸露的玻璃碳上表现出的行为形成了鲜明的对比，在裸露的玻璃碳上，PES +的还原是受扩散控制的，但PESH的氧化是表面受限氧化还原过程的特征。分配系数的直接确定因与准确知道溶胀聚合物的厚度有关的不确定性而变得复杂。因此，比较了裸露和聚合物修饰电极上PES +还原的Randles-Sevcik数据，以定性评估可能分配的程度，确定其范围为10（1）-10（2）。分配系数确定为9.1 +/- 0.4，该值与定性评估一致。发现分区对溶液中存在的阳离子敏感，其顺序为：从Li +，Na +和K +的溶液中提取PES +的顺序为：Li +> Na +> K +。连续循环实验表明，PES +在还原循环过程中会分配到薄膜中，以恢复由物质的电化学消耗引起的薄膜中的平衡浓度。

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