کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
193027 | 459759 | 2009 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synchronized current oscillations of formic acid electro-oxidation in a microchip-based dual-electrode flow cell Synchronized current oscillations of formic acid electro-oxidation in a microchip-based dual-electrode flow cell](/preview/png/193027.png)
We investigate the oscillatory electro-oxidation of formic acid on platinum in a microchip-based dual-electrode cell with microfluidic flow control. The main dynamical features of current oscillations on single Pt electrode that had been observed in macro-cells are reproduced in the microfabricated electrochemical cell. In dual-electrode configuration nearly in-phase synchronized current oscillations occur when the reference/counter electrodes are placed far away from the micro-electrodes. The synchronization disappears with close reference/counter electrode placements. We show that the cause for synchronization is weak albeit important, bidirectional electrical coupling between the electrodes; therefore the unidirectional mass transfer interactions are negligible. The experimental design enables the investigation of the dynamical behavior in micro-electrode arrays with well-defined control of flow of the electrolyte in a manner where the size and spacing of the electrodes can be easily varied.
Journal: Electrochimica Acta - Volume 55, Issue 2, 30 December 2009, Pages 395–403