کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6661781 | 1426556 | 2018 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Anion effects on the redox kinetics of positive electrolyte of the all-vanadium redox flow battery
ترجمه فارسی عنوان
اثر آنیون بر روی سینتیک بازسازی مجدد الکترولیت مثبت باطری جریان برگشتی همه وانادیم
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
The kinetics of the VO2Â +/VO2+ redox reaction have been investigated in 1Â M sulfuric and 1Â M phosphoric acid by cyclic voltammetry, chronoamperometry, electrochemical impedance spectroscopy and flow battery tests. It was found that in 1Â M phosphoric acid the electron transfer constant k0 is up to 67 times higher than in 1Â M sulfuric acid. At higher over-potentials the determined currents match for the two electrolytes. This over-potential dependent difference in electron transfer constant is explained by variable contributions from three reaction mechanisms for the oxidation of VO2Â + to VO2+, and by the presence of adsorbed intermediates for the reduction of VO2+. This study shows that the redox kinetics of the VO2Â +/VO2+ can be considerably accelerated by altering the chemical environment of the vanadium ions, and that this effect can also be transferred into a flow battery.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 819, 15 June 2018, Pages 306-311
Journal: Journal of Electroanalytical Chemistry - Volume 819, 15 June 2018, Pages 306-311
نویسندگان
Matthäa Verena Holland-Cunz, Jochen Friedl, Ulrich Stimming,