Carbon nanotubes contain metal impurities which are responsible for the "electrocatalysis" seen at some nanotube-modified electrodes
Carbon nanotubes contain metal impurities which are responsible for the "electrocatalysis" seen at some nanotube-modified electrodes
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DOI：
10.1002/anie.200600033
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发表时间：
2006-01-01
影响因子：
16.6
通讯作者：
Compton, RG
中科院分区：
文献类型：
--
作者：
Banks, CE;Crossley, A;Compton, RG
碳纳米管（CNT）已经成为一类新型的纳米材料，因此在众多领域中受到了相当大的关注，[1-7]在电化学和电催化中，由于碳纳米管改性电极的“电催化”特性，在过去十年中，它们的使用已经升级，也就是说，电极通常由碳制成，具有纳米管薄膜。[8-13]这些特性包括过电位的降低，伏安峰高的增加，这有助于降低检测限和提高分析传感的灵敏度，同时很少或没有观察到表面污染。[8-10我们比较了铁氰化物的电还原和肾上腺素在水溶液中在碳纳米管修饰电极上的氧化与边缘平面热解石墨（EPPG）电极的响应。[11 EPPG电极是由高度有序的热解石墨构成的电极，其中石墨层垂直于盘表面并且以3.35的层间距分开。表面缺陷以暴露石墨层边缘的台阶形式出现（见图1A）。相反，制造基面热解石墨（BPPG）电极，使得石墨层平行于表面。当将CNT修饰的电极与EPPG电极进行比较时，在两个电极处观察到伏安法中的类似响应（参见图1B），这使得我们能够证明
Carbon nanotubes (CNTs) have emerged as a novel class of nanomaterials and consequently receive considerable interest in a plethora of areas,[1–7] none more so than in electrochemistry and electrocatalysis where their use has escalated over the last decade owing to the reported “electrocatalytic” properties of carbon-nanotube-modified electrodes, that is, electrodes usually made of carbon with a film of nanotubes.[8–13] These properties include reductions in overpotentials, increments in the voltammetric peak heights which facilitates lower detection limits and enhanced sensitivities in analytical sensing coupled with little or no observed surface fouling.[8–10, 13]We have compared the electroreduction of ferricyanide and the oxidation of epinephrine in aqueous solutions at carbon-nanotube-modified electrodes with the response of an edge-plane pyrolytic graphite (EPPG) electrode.[11, 12] The EPPG electrode is an electrode constructed from highly ordered pyrolytic graphite where the graphite layers are perpendicular to the disc surface and are separated with an interlayer spacing of 3.35. Surface defects occur in the form of steps exposing the edges of the graphite layers (see Figure1A). Conversely a basal-plane pyrolytic graphite (BPPG) electrode is fabricated such that the layers of graphite lie parallel to the surface. When a CNT-modified electrode was compared with an EPPG electrode, an analogous response in the voltammetry was observed at both electrodes (see Figure 1B) allowing us to demonstrate that