کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6606171 | 459523 | 2016 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Acid-base and redox equilibria of a tris(2-pyridylmethyl)amine copper complex; their effects on electrocatalytic oxygen reduction by the complex
ترجمه فارسی عنوان
تعادل اسید بنزین و بازدارندگی یک ترکیب مسی سه گانه (2-پیریدیل متیل) آمین؛ اثرات آنها بر کاهش اکسیژن الکتروکاتالیستی توسط پیچیده است
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
The electrochemical behaviors of a tris(2-pyridylmethyl)amine copper complex (Cu-tmpa) in aqueous buffer solutions were examined. Acid-base and redox equilibria were clarified using cyclic voltammetry and ESR spectra. The pKa values of both CuII-tmpa and CuI-tmpa were determined based on the pH-E°Ⲡdiagram of Cu-tmpa. The slopes in the diagram strongly suggest the presence of hydroxo-bridged dimer complexes of CuII-tmpa. This notion is supported by ESR spectra. The oxygen reduction reaction (ORR) by Cu-tmpa was also examined over a wide range of pHs. The ORR current of Cu-tmpa decreased significantly above pH 12.0. This pH value coincides with the pKa value of CuI-tmpa. The decrease in ORR current in basic solution is attributed to the formation of a hydroxo complex of CuI. These findings are important for the application of Cu complexes as cathodes in fuel cells.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 211, 1 September 2016, Pages 193-198
Journal: Electrochimica Acta - Volume 211, 1 September 2016, Pages 193-198
نویسندگان
Masafumi Asahi, Shin-ichi Yamazaki, Shinobu Itoh, Tsutomu Ioroi,