کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1286674 973199 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of different buffer solutions on the performance of anodic Pt-Ru/C nanoparticle electrocatalysts for a direct methanol fuel cell
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Influence of different buffer solutions on the performance of anodic Pt-Ru/C nanoparticle electrocatalysts for a direct methanol fuel cell
چکیده انگلیسی

This research aims to improve the activity of Pt-Ru nanoparticle electrocatalysts and thus, to lower the catalyst loading in anodes for methanol electrooxidation. The direct methanol fuel cell (DMFC) anodic Pt-Ru/C nanoparticle electrocatalysts were prepared using a chemical reduction method. The pH values of the reductive solutions were adjusted by different buffer solutions of CH3COONa–NaOH, C6H5Na3O7–NaOH, and Na2CO3–NaHCO3, respectively. The performance of the nanoparticle electrocatalysts were examined by cyclic voltammetry, chronoamperometry, and amperometric i–t curves using a glassy carbon working electrode in a solution of 0.5 mol L−1 CH3OH and 0.5 mol L−1 H2SO4. The structures and micro-morphology of the Pt-Ru/C nanoparticles were determined and observed by X-ray diffraction (XRD) and transmission electron microscopy. XRD analysis showed that all of catalysts exhibited face-centered cubic (fcc) structures. No diffraction peaks indicated the presence of either pure Ru or Ru-rich hexagonal close packed (hcp) phase. The size of the Pt-Ru/C nanoparticles prepared with a C6H5Na3O7–NaOH solution was relatively small ∼4.3 nm. Its size distribution in carbon was more homogeneous. The electrochemical active measurements results showed that the catalytic activity and the stability of Pt-Ru/C nanoparticle electrocatalyst prepared with a C6H5Na3O7–NaOH solution for methanol electrooxidation was higher than that from the other solutions due to the citrate complexation stabilizing effect and a competing adsorption effect.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 166, Issue 2, 15 April 2007, Pages 317–323
نویسندگان
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