Cyclic voltammetry on electrode surfaces covered with porous layers: An analysis of electron transfer kinetics at single-walled carbon nanotube modified electrodes
Cyclic voltammetry on electrode surfaces covered with porous layers: An analysis of electron transfer kinetics at single-walled carbon nanotube modified electrodes
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DOI：
10.1016/j.snb.2008.03.015
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发表时间：
2008-08-12
影响因子：
8.4
通讯作者：
Compton, Richard G.
中科院分区：
文献类型：
--
作者：
Streeter, Ian;Wildgoose, Gregory G.;Compton, Richard G.
本文用循环伏安法研究了亚铁氰化物在多层单壁碳纳米管修饰的玻碳电极上的氧化。电流响应被解释在半无限平面扩散向宏电极表面和在纳米管之间的口袋中捕获的电活性物质的氧化方面。薄层模型用于说明多孔层内扩散的影响。据发现，一个半无限的平面扩散模型是不合适的解释在这个电极表面的电子转移的动力学。特别是，在比较裸电极和纳米管修饰电极之间的伏安峰-峰电位分离以推断经由纳米管的电子转移的电催化方面，应谨慎。(C)2008 Elsevier B. V.保留所有权利。
Cyclic voltammetry is recorded of the oxidation of ferrocyanide on a glassy Carbon electrode modified with multiple layers of single-walled carbon nanotubes. The current response is interpreted in terms of semi-infinite planar diffusion towards the macro-electrode surface and in terms of oxidation of the electroactive species trapped in pockets in between the nanotubes. A thin layer model is used to illustrate the effects of diffusion within a porous layer. It is found that a semi-infinite planar diffusion model alone is not appropriate for interpreting the kinetics of the electron transfer at this electrode surface. In particular, caution should be exercised in respect of comparing voltammetric peak-to-peak potential separations between naked electrodes and nanotube-modified electrodes for the inference of electrocatalysis via electron transfer via the nanotubes. (C) 2008 Elsevier B.V. All rights reserved.