Electrochemistry of Silver/Metal Oxide-based Catalysts on Carbon Support for Cathode Electrode of Reducing Sugar Alkaline Fuel Cells
Abstract
This study investigated the electrochemistry of silver/metal oxide-based catalysts on carbon support, AgVxOy/C, and AgMnxOy/C. In order to analyse the potential of catalysts in cathode electrodes for reducing sugar in alkaline fuel cell without an exchange membrane. The physical properties of the catalysts were investigated by scanning electron microscopy, and the quantity of elements in the catalysts was determined by energy dispersive x-ray spectroscopy. The electrochemical characteristics of the catalytic reduction reaction were measured by a cyclic voltammetry technique. It is found that in higher fuel concentrations the AgMnxOy/C catalyst had better catalytic activity than the AgVxOy/C catalyst. The maximum current density of the reduction peak for the AgMnxOy/C catalyst was -0.51 mA.cm-2 at -0.22 V. Although, the average particle size of AgMnxOy/C was larger than that of the AgVxOy/C catalyst.
Keywords : alloy catalysts, cathode, reducing sugar, alkaline fuel cells
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