کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1277574 1497576 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation, characterization and application of Pt–Ru–Sn/C trimetallic electrocatalysts for ethanol oxidation in direct fuel cell
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Preparation, characterization and application of Pt–Ru–Sn/C trimetallic electrocatalysts for ethanol oxidation in direct fuel cell
چکیده انگلیسی

This work aimed to develop a method for the preparation of carbon-supported platinum nanocatalysts modified with Ruthenium and Tin, which were then evaluated for ethanol eletrooxidation in direct fuel cells. The Pechini method was employed to obtain these catalysts. This method consists in the decomposition of a polymeric precursor of metal salts. Nanocatalysts containing different Pt/Ru/Sn molar ratios were prepared by keeping the carbon/metal ratio at a constant value of 60/40%. The obtained nanoparticles were physico-chemically characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and Energy Dispersive X-ray Spectroscopy (EDX). Crystallite size of around 7.0 nm and 5.8 nm were achieved for the bimetallic and trimetallic nanocatalysts, respectively. The experimental composition was close to the nominal one, but the metal particles were not evenly distributed on the carbon surface. Electrochemical characterization of the nanoparticles was accomplished by cyclic voltammetry (CV) and chronoamperometry. High Performance Liquid Chromatography (HPLC) was carried out after ethanol electrolysis for determining the products generated. Acetaldehyde was the main electrolysis product and traces of CO2 and acetic acid were also detected. Addition of Ru and Sn to the pure Pt nanoelectrocatalyst significantly improved its performance in ethanol oxidation. The onset potential for ethanol electrooxidation was 0.2 V vs. RHE, in the case of the trimetallic nanocatalyst Pt0.8Ru0.1Sn0.1/C, which was lower than that obtained for the pure Pt catalyst (0.45 V vs. RHE).


► In this study we prepared PtSnRu/C catalysts by the Pechini method.
► This is a way to prepare robust nanoparticles.
► Addition of Ru to the PtSn/C enhances the catalytic activity.
► Acetaldehyde is the major oxidation product obtained.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 36, Issue 17, August 2011, Pages 11034–11042
نویسندگان
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