Ethanol electrooxidation in acid medium was investigated on Pt-Ru-Sn/C, Pt-Ru/C and Pt-Sn/C. The electrocatalysts were synthesized by microwave assisted chemical reduction reaction. The samples were characterized by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD) and electrochemical analysis for the electrooxidation of ethanol. The ternary electrocatalyst was evaluated in an experimental Direct Ethanol Fuel Cell (DEFC). The method of synthesis used in this work allowed the formation of nanostructured electrocatalysts. The results obtained by electrochemical studies showed that the ternary system Pt-Ru-Sn/C exhibited the highest activity with respect to the binary systems Pt-Ru/C and Pt-Sn/C for carrying out the ethanol electrooxidation reaction. 0.4 mg∙cm-2 of electrocatalytic load of Pt-Ru-Sn/C was placed in the anode of an experimental fuel cell operating at room temperature. It was possible to obtain a power density of 0.14, 0.12 and 0.11 mW∙cm-2 after 20, 40 and 60 minutes respectively. The experiments were carried out at a controlled temperature of 297 K and they showed the feasibility to produce electricity at room temperature by using this ternary electrocatalyst in Direct Ethanol Fuel Cells.
Nanostructured Electrocatalyst, Pt-Ru-Sn/C, Ethanol electrooxidation, Direct Ethanol Fuel Cell.
Authors like to thank Mrs. Maria Luisa Ramon Garcia for the XRD characterization and discussion of results and Mr. Gildardo Casarrubias Segura for sample preparations. Mr. Carlos Flores Morales, Dr. Hilda Esparza Ponce and Dr. Jose lvaro Chavez Carvayar, for their support for the samples characterization by TEM. Authors are also grateful to CONACYT Grants 128545 and DGAPA PAPIIT IN111011 to develop and support this project. CONACYT Ph.D. scholarship 212785 for Francisco Ginez is appreciated.
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