Silver and Silver Alloy on Carbon-supported Catalysts for Cathodes in Proton Exchange Membrane Fuel Cell and Direct Ethanol Fuel Cell
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Abstract
This research was focused on the synthesis of 20 %wt silver, silver platinum alloy, and silver-copper alloy catalysts on carbon Vulcan XC-72 supporter for proton exchange membrane fuel cell (PEMFC) and direct ethanol fuel cell (DEFC) cathode using sodium borohydride method. Herein, the ratio of silver and platinum or copper sources was 1:1 by weight. The obtained catalysts were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the electro-activity performance was investigated on single-cell testing. XRD and TEM results confirmed the catalytic products of the Ag metal, AgPt alloy, and silver copper oxide (AgxCu2-xO). Therefore, the particle size of the catalytic 20 %wt AgPt/C was observed in the smallest size of about 4.71±1.03 nm. The catalyst was selected for PEMFC and DEFC cathode testing. It showed high power density of 14.68 and 1.26 W/cm2.g(M), respectively.
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