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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/2406| SYNTHESIS OF CARBON-BASED SUPPORT FOR RUTHENIUM ELECTROCATALYST FOR ORR FORMED BY GRAPHITE AND ASPHALT CARBON PYROLYZED | |
| MIGUEL JESUS MELENDEZ ZARAGOZA Alejandro López Ortíz Jesús Manuel Salinas Gutiérrez VIRGINIA HIDALINA COLLINS MARTINEZ ANA MARISELA LEGARRETA MENDOZA DANIEL LARDIZABAL GUTIERREZ | |
| Acceso Abierto | |
| Atribución-SinDerivadas | |
| The oxygen reduction reaction (ORR) that takes place in the cathode of PEM fuel cells has been an object of study of great interest in the electrocatalysis field, due to its low reaction kinetics, compared to the hydrogen oxidation reaction (HOR) that occurs at the anode of the cell. Several research groups have focused on developing economic alternatives that can approximate the intrinsic kinetic values of these two reactions. Platinum (Pt) is the most efficient electrocatalyst for ORR, followed by other transition metals (Ru, Ir, Fe). The synthesis of metallic catalysts using different kinds of supports have improved their performance and helped to reduce their cost in the past. These supports are aimed to increase the dispersion of the active phase and reduce the metal loading without affecting the catalytic activity. Carbon black is a common used support, due to its high surface area, pore size distribution, and high electrical conduction properties. This study offers an alternative carbon-based support, which is obtained by pyrolysis of asphalt/graphite at 600°C (S-AG) under a nitrogen atmosphere (N2). Through the combination of the physical and chemical properties of the two different carbon sources (asphalt and graphite) an improvement effect on the performance of the support is expected with respect to commercial carbon Vulcan®. For their performance evaluation, Ruthenium (Ru) at 20% W was used as an active phase. Ruthenium(III) chloride hydrate (RuCl3•XH20) was used as a precursor, which was reduced in two steps, the first one by NaHB4 and the second in a reducing atmosphere (Ar/H2) at 420°C for 1h. The obtained material was characterized by elemental analysis (ICP), XRD, BET Area and SEM. For the electrochemical evaluation, cyclic (CV) and linear sweep (LV) voltammetry were used. In a first stage of the study, results indicate a better electrocatalytic activity of the ruthenium (Ru) impregnated on the S-AG synthesized support. | |
| 2018 | |
| Memoria de congreso | |
| Inglés | |
| PROCESOS QUÍMICOS | |
| Aparece en las colecciones: | Artículos de Congresos |
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| Extensos Ana SMH 2018.pdf | 274.14 kB | Adobe PDF | Visualizar/Abrir |