Ethanol electro-oxidation on catalysts with TiO2 coated carbon nanotubes as support |
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Institution: | 1. INFIQC-CONICET, Dpto. de Fisicoquímica – Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba 5000, Argentina;2. Laboratorio de Ingeniería Metalúrgica, Facultad Regional Córdoba, Universidad Tecnológica Nacional, Maestro M. López esq. Cruz Roja Argentina, Ciudad Universitaria, Córdoba 5000, Argentina |
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Abstract: | Pt–TiO2/CNTs electrocatalysts for direct ethanol fuel cells (DEFCs) were prepared by sol–gel and ethylene glycol reduction method. XRD and TEM showed that the size of the Pt particles on TiO2/CNTs is 3.5–4 nm and with narrow particle size distribution. HRTEM revealed that a thin layer of uniform amorphous TiO2 on CNTs was formed and the faces of the Pt crystal on Pt–TiO2/CNTs catalysts were quite “rough” and “rounded” and some grain bounders and/or twins also appeared. The electrochemical studies using cyclic voltammetry (CV), chronoamperometry and CO stripping voltammetry indicate that Pt–TiO2/CNTs catalysts have higher electro-catalytic activity and CO-tolerance for ethanol oxidation than Pt/C (20 wt% Pt, E-TEK) and Pt/CNTs catalyst in acid. The Pt/TiO2 molar ratio was also optimized and proved that 1:1 was the best Pt/TiO2 molar ratio. |
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