Double potential step chronoamperometry at a microband electrode: Theory and experiment

被引：7

作者：

Barnes, Edward O. ^{[1
]}

Xiong, Linhongjia ^{[1
]}

Ward, Kristopher R. ^{[1
]}

Compton, Richard G. ^{[1
]}

机构：

[1] Univ Oxford, Dept Chem, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2013年 / 701卷

基金：

英国工程与自然科学研究理事会;

关键词：

Microband electrode; Double potential step; Diffusion coefficients; Measurement of chronoamperometry; Numerical simulation; TEMPERATURE IONIC LIQUIDS; EXPONENTIALLY EXPANDING MESH; MICRODISK ELECTRODES; DIFFUSION-PROCESSES; HYDRODYNAMIC VOLTAMMETRY; EFFICIENT SIMULATION; STEADY-STATE; ELECTROCHEMICAL OXIDATION; MICROFLUIDIC CHANNELS; MICROELECTRODES;

D O I：

10.1016/j.jelechem.2013.05.002

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Numerical simulation is used to characterise double potential step chronoamperometry at a microband electrode for a simple redox process, A + e(-) reversible arrow B, under conditions of full support such that diffusion is the only active form of mass transport. The method is shown to be highly sensitive for the measurement of the diffusion coefficients of both A and B, and is applied to the one electron oxidation of decamethyl-ferrocene (DMFc), DMFc - e(-) reversible arrow DMFc(+), in the room temperature ionic liquid 1-propyl-3-methylimidazolium bistrifluoromethylsulfonylimide. Theory and experiment are seen to be in excellent agreement and the following values of the diffusion coefficients were measured at 298 K: D-DMFc = 2.50 x 10(-7) cm(2) s(-1) and DDMFc+ = 9.50 x 10(-8) cm(2) s(-1). (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：59 / 68

页数：10

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