| Summary: | 碩士 === 長庚大學 === 化工與材料工程學系 === 102 === Microelectrode are defined as having at least one electrode one dimension in the micron range, and the importance of these electrodes is (i) very little current passes; (ii) their small size; (iii) there is a transition from liner to spherical diffusion at increasing time of measurement. The latter diffusion profile is characterized not only by much enhanced transport rates to the electrode but also the onset of stationary diffusion at long times. Thus, in Cyclic Voltammetric measurements (CV’s), high scan rates give rise to CV’s of normal appearance, but at lower scan rates, the current rises to limiting value which is proportional to the concentrations of electro-active reagents.
In this study, gold (Au) was used to study the electrochemical oxidation of carbon monoxide (CO) in acidic or alkaline electrolytes which were previously studied by many authors with inconsistent findings and conclusions. The electrochemical oxidation of solution phase CO on Au electrode indicates the less positive potentials due to negligible influence of surface adsorbed CO in comparison of the adsorbed CO oxidation on Platinum (Pt) electrode in either in acidic or alkaline electrolyte. Au Microelectrode was used to study the rate of mass transfer diffusion of the dissolved CO electrocatalysis in acidic or alkaline system.
The CV’s data shows the onset potential of dissolved CO oxidation of fabrication of Au microelectrode with 1.0 V (vs. RHE), fabrication of Au microelectrode in acidic system. In alkaline system, the onset potential of dissolved CO oxidation of Au-RDE and fabrication of Au microelectrode were similarly with 0 V (vs. RHE).
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