Electrochemical and spectroelectrochemical (SERS) studies of the reduction of methylene blue on a silver electrode
Electrochemical and spectroelectrochemical (SERS) studies of the reduction of methylene blue on a silver electrode
复制标题
DOI：
10.1016/s0022-0728(02)00832-x
复制
发表时间：
2002-05-31
影响因子：
4.5
通讯作者：
Rubim, JC
中科院分区：
文献类型：
--
作者：
Nicolai, SHD;Rodrigues, PRP;Rubim, JC
用循环伏安法、转盘电极技术、计时电流法和表面增强拉曼光谱(SERS)研究了亚甲基蓝(MB+)在银电极上的电化学行为。电化学结果表明，MB+在两个单电子步骤中被还原，这两个还原过程至少部分受质量传输控制。电化学测试还表明，MB+在银电极表面的还原促进了两种不同薄膜的形成。SERS谱表明，随着电位的增加，电极表面存在明显的物种。这种对电位的依赖使得能够表征与第一和第二膜形成相关的化学物种。它们分别是自由基阳离子(HMB.+)和亮亚甲基蓝(LMB)。(C)2002 Elsevier Science B.V.保留所有权利。
The electrochemical behavior of methylene blue (MB+) on a silver electrode has been investigated by cyclic voltammetry, the rotating disk electrode technique, chronoamperometry and surface-enhanced Raman spectroscopy (SERS). The electrochemical results have shown that MB+ is reduced in two one-electron steps and that these two reduction processes are, at least partially, controlled by mass transport. The electrochemical measurements have also shown that the reduction of MB+ on the surface of a silver electrode promotes the formation of two different films. The SERS spectra have shown the presence of distinct species on the electrode surface as the potential is made more negative. Such a dependence on the potential allowed the characterization of the chemical species associated with the first and second film formation. They are, respectively, the radical cation (HMB. +) and leucomethylene blue (LMB). (C) 2002 Elsevier Science B.V. All rights reserved.