Liu Chong-Yang, Bard Allen J
Department of Chemistry and Biochemistry, Laboratory of Electrochemistry and Center for Nano- and Molecular Science, University of Texas at Austin, Austin, TX 78712, USA.
Anal Chem. 2005 Aug 15;77(16):5339-43. doi: 10.1021/ac050389e.
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.
我们描述了一种电化学电池，它包含一个法拉第电极（铂超微电极）和一个阻塞（极化）电极（带有绝缘二氧化硅膜的硅），该阻塞电极用作电容性对电极。当在两个电极之间施加偏压时，在铂电极处观察到来自法拉第过程的电流，在阻塞电极处观察到电容性电流。当溶液沿着绝缘体移动以持续接触新鲜表面（使一层带电离子和电子反电荷进入气相）时，可获得稳定的充电电流。在这种电池中，在脉冲激发下，从含有Ru(bpy)(3)2+的体系中清晰地观察到了电致化学发光，这表明法拉第反应可以在电化学电池中进行，而在对电极处不产生任何产物。建议将这种系统用于纳米系统和合成中所需物种的库仑添加。
