کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6473098 1424142 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of ethanol oxidation catalysts by rotating disc voltammetry
ترجمه فارسی عنوان
ارزیابی کاتالیزورهای اکسیداسیون اتانول با چرخش ولتامتری دیسک
کلمات کلیدی
ولتامتر دیسک چرخش اکسیداسیون اتانول، بازده فارادی الکترو کاتدی، حمل و نقل جمعی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی

Rotating disk voltammetry of ethanol at PtRu black and carbon supported Pt (Pt/C) catalyst layers has been investigated in 1 M sulfuric acid. When thick catalyst layers were used, increasing the rotation rate resulted in significant increases in current and produced linear Koutecky-Levich plots. However, a mass transport limited current was not reached due to inhibition of ethanol oxidation by oxide formation at high potentials. For PtRu black, the slopes of Koutecky-Levich plots gave an average number electrons transferred (nav) of 3.6 that was independent of potential and indicated that the predominant product was acetic acid. Similar nav values were obtained for Pt/C at high potentials, but decreased at potentials below 0.78 V vs. SHE, where the Koutecky-Levich plots began to show significant curvature. Non-linear Koutecky-Levich plots were observed at all potentials for thinner Pt/C layers, and accurate nav values could not be obtained. This appears to be due to an increase in the kinetic current with rotation rate. Since acetaldehyde is known to inhibit ethanol oxidation at Pt, its convective removal appears to be responsible for the increased kinetic current.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 215, 10 October 2016, Pages 84-92
نویسندگان
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