کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
192144 459736 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Alkylidynes-modified Pt nanoparticles: A spectroelectrochemical (SERS) and electrocatalytic study
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Alkylidynes-modified Pt nanoparticles: A spectroelectrochemical (SERS) and electrocatalytic study
چکیده انگلیسی

Alkylidyne-modified (propylidyne or ethylidyne) Pt nanoparticles were electrochemically prepared and characterised by Surface Enhanced Raman Spectroscopy (SERS) and cyclic voltammetry. Formic acid oxidation on alkylidyne-modified Pt nanoparticles was used as probe reaction to evaluate their electrocatalytic properties. SERS spectra show that, in the presence of propylidyne, the observed frequency of ν[CO] is red-shifted with respect to the typical values on polycrystalline Pt in acidic medium, which suggests the existence of an instabilization of the carbon monoxide poisonous species, what contributes to the enhanced electrocatalytic activity. Similar electrooxidation current densities were obtained for both propylidyne and ethylidyne surface modifiers suggesting that the instabilization of the COads seems to be non-dependant of the nature of the alkylidyne intermediates, and that the enhanced mechanism is similar in both cases. The present paper shows how in situ spectroscopic measurements can help to understand the effect of the surface modifiers on the electrocatalytic properties of Pt nanoparticles, which can be effectively applied in real applications. Thus, this experimental methodology will allow selecting those modified-electrocatalysts with better properties.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 54, Issue 27, 30 November 2009, Pages 6971–6977
نویسندگان
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