کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
192083 459735 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of CO2, HCO3− and CO3−2 on oxygen reduction in anion exchange membrane fuel cells
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Effect of CO2, HCO3− and CO3−2 on oxygen reduction in anion exchange membrane fuel cells
چکیده انگلیسی

The effect of carbonate and bicarbonate anions on the oxygen reduction reaction was investigated in four alkaline solutions (pH ∼ 14) on a Pt disk type electrode with varying concentrations of carbonate and bicarbonate. The addition of carbonate and bicarbonate had two primary effects on the observed voltammetric behavior: i) The Tafel slope shifts positive with increasing carbonate/bicarbonate concentration, indicating that the carbonate anions may compete for surface adsorption sites; and ii) The dissolved oxygen concentration and diffusion coefficient are depressed with increasing anion concentration. Finally, adding CO2 to the cathode stream of an anion exchange membrane fuel cell caused an improvement in the device performance under fully hydrated conditions, suggesting that the fuel cell was operating at least partially under the carbonate cycle.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 55, Issue 5, 1 February 2010, Pages 1638–1644
نویسندگان
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