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首页> 外文期刊>Electroanalysis >A comparison of electron transfer kinetics of three common carbon electrode surfaces in acetonitrile and in room temperature ionic liquid 1-butyl-3-methylimidiazonium hexafluorophosphate: Correlation to surface structure and the limit of the diffusion domain approximation
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A comparison of electron transfer kinetics of three common carbon electrode surfaces in acetonitrile and in room temperature ionic liquid 1-butyl-3-methylimidiazonium hexafluorophosphate: Correlation to surface structure and the limit of the diffusion domain approximation

机译：乙腈和室温离子液体1-丁基-3-甲基亚甲基重氮六氟磷酸盐中三个共同碳电极表面的电子转移动力学比较：与表面结构的关系和扩散域近似的极限

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摘要

We report the comparison of electron transfer kinetic parameters of the ferrocene redox couple in both acetonitrile and in room temperature ionic liquid (RTIL) 1-butyl-3-methylimidiazonium hexafluorophosphate ([C_4mim] [PF_6]), using edge plane pyrolytic graphite (EPPG), basal plane pyrolytic graphite (BPPG) and glassy carbon (GC) electrodes. Each electrode surface was characterized using SEM and AFM and the surface morphology was analyzed in terms of surface heterogeneity including the distribution of edge plane defects. The experimental data were modeled using both one and two dimensional simulations to correlate the electron transfer parameters obtained with the different surface structure of each electrode. Furthermore, we show that the diffusion domain approximation (commonly used to accurately simulate electron transfer kinetics at graphitic surfaces) breaks down when a BPPG electrode is used in RTIL and demonstrate the near impossibility of assigning rate constant to the basal plane surface.
机译：我们报告使用边缘平面热解石墨（EPPG）在乙腈和室温离子液体（RTIL）1-丁基-3-甲基咪唑鎓六氟磷酸盐（[C_4mim] [PF_6]）中二茂铁氧化还原对的电子转移动力学参数的比较），基底平面热解石墨（BPPG）和玻璃碳（GC）电极。使用SEM和AFM对每个电极表面进行表征，并根据表面异质性（包括边缘平面缺陷的分布）分析表面形态。使用一维和二维模拟对实验数据进行建模，以将获得的电子转移参数与每个电极的不同表面结构相关联。此外，我们显示当在RTIL中使用BPPG电极时，扩散域近似（通常用于精确地模拟石墨表面的电子转移动力学）会破裂，并且证明了将速率常数分配给基平面几乎是不可能的。

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