Electrochemistry and electrogenerated chemiluminescence with a single faradaic electrode
Electrochemistry and electrogenerated chemiluminescence with a single faradaic electrode
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DOI：
10.1021/ac050389e
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发表时间：
2005-08-15
影响因子：
7.4
通讯作者：
Bard, AJ
中科院分区：
文献类型：
--
作者：
Liu, CY;Bard, AJ
我们描述了一种电化学电池，包含一个单一的法拉第电极（Pt超微电极）和一个封闭的（极化）电极（Si与绝缘SiO2膜），作为一个电容性的反电极。当在两个电极之间施加偏压时，在Pt处观察到来自法拉第过程的电流，并且在阻断电极处观察到电容电流。当溶液沿着绝缘体移动，与新鲜表面连续接触时（在气相中出现一层带电离子和电子反电荷），获得稳定的充电电流。在脉冲激发下，在这种电解槽中，从含有Ru（bpy）（3）（2+）的体系中清楚地观察到电致化学发光，表明法拉第反应可以在电化学电池中进行，而在对电极上不产生任何产物。建议在纳米系统和合成中使用这样的系统用于库仑法添加所需的物种。
We describe an electrochemical cell containing a single faradic electrode (a Pt ultramicroelectrode) and a blocked (polarized) electrode (Si with an insulating SiO2 film) that served as a capacitive counter electrode. When a bias was applied between the two electrodes, a current was observed from a faradic process at Pt and a capacitive current at the blocking electrode. A steady charging current was obtained when the solution was moved along the insulator to continuously contact fresh surface (emersing a layer of charged ions and electronic countercharge into the gas phase). Electrogenerated chemiluminescence was clearly observed from a system containing Ru(bpy)(3)(2+) in this kind of cell under pulsed excitiation, demonstrating that faradaic reactions can be carried out in an electrochemical cell without generation of any products at a counter electrode. The use of such a system for coulometric addition of desired species in nanosystems and in synthesis is suggested.