Electroreduction of Viologen Phenyl Diazonium Salts as a Strategy To Control Viologen Coverage on Electrodes
Electroreduction of Viologen Phenyl Diazonium Salts as a Strategy To Control Viologen Coverage on Electrodes
复制标题
紫罗碱苯基重氮盐的电还原作为控制电极上紫罗碱覆盖的策略
DOI：
10.1021/acs.langmuir.6b04317
复制
发表时间：
2017-01-31
期刊：
影响因子：
3.9
通讯作者：
Wang, Yuechuan
中科院分区：
文献类型：
--
作者：
Cao, Liangcheng;Fang, Gan;Wang, Yuechuan
大多数报道的芳基重氮盐的电接枝导致形成共价连接的膜，其具有低于5nmol.cm有限表面覆盖率（-2）。在这里，我们报告的制备更高的厚度氧化还原活性紫精接枝电极的紫精苯基重氮盐的电还原，通过循环伏安（CV）扫描或电解使用一个固定的电位。这两种方法都成功地应用于各种导电表面，包括玻璃碳（GC），金盘，氧化铟锡玻璃，介孔TiO 2电极和3D压缩碳纤维。通过CV电还原在GC电极上实现了稳健的最大紫精覆盖率，γ（紫精）= nmol.cm-2）。电还原保持在固定电位在E-appl。=-0.3V可以通过简单地调节电沉积时间t（appl.）以可控的方式制造γ（紫精）在0-37范围内的紫精接枝电极。nmol.cm发现时间依赖性伽马（紫精）为10 nmol.cm（-2@2 min）、20 nmol.cm（-2@4.2 min）和30 nmol.cm（-2@7 min）。此外，与140 nmol.cm（-2）的伽马（紫精）偶联的TiO 2电极表现出电致变色性能，颜色从浅黄色变为蓝色和红棕色。
A majority of the reported electrografting of aryldiazonium salts result in the formation of covalently attached films with a limited surface coverage of below 5 nmol.cm(-2). Herein, we report the preparation of higher-thickness redox-active viologen-grafted electrodes from the electro-reduction of viologen phenyl diazonium salts, by either cyclic voltammetric (CV) sweeps or electrolysis using a fixed potential. Both of the methodologies were successfully applied for various conductive surfaces, including glassy carbon (GC), gold disc, indium tin oxide glass, mesoporous TiO2 electrodes, and 3D compacted carbon fibers. A robust maximal viologen coverage, Gamma(viologen) = 9.5 nmol.cm(-2), was achieved on a GC electrode by CV electroreduction. Electroreduction held at a fixed potential at E-appl.. = -0.3 V can fabricate viologen-grafted electrodes with Gamma(viologen) in the range of 0-37 nmol.cm(-2) in a controllable way, by simply adjusting the electrodeposition time t(appl.). Time-dependent Gamma(viologen) were found to be 10 nmol.cm(-2)@2 min, 20 nmol.cm(-2)@4.2 min, and 30 nmol.cm(-2)@7 min. Furthermore, a TiO2 electrode coupled with Gamma(viologen) of 140 nmol.cm(-2) exhibited electrochromic performance, with the color changing from pale yellow to blue and red brown.