کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1272153 1497479 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrocatalysis of oxygen reduction on carbon nanotubes with different surface functional groups in acid and alkaline solutions
ترجمه فارسی عنوان
الکترو کاتالیزوری کاهش اکسیژن در نانولوله های کربنی با گروه های عملکردی مختلف در محلول های اسیدی و قلیایی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• Surface functional groups can affect catalytic activity and selectivity of MWCNTs.
• In acid solution, the catalytic performance is MWCNTs-COOH > MWCNTs-OH > MWCNTs.
• In alkaline medium, the catalytic performance is MWCNTs > MWCNTs-COOH > MWCNTs-OH.
• The oxygen reduction proceeds mainly through the two-electron pathway.
• Interpretation of the different catalytic order in these two media is discussed.

Electrochemical measurements, including cyclic voltammograms (CVs) and rotating ring disk electrode (RRDE) technique, are applied to determine the impact of surface functional groups on the electrocatalytic activity and H2O selectivity of multi-walled carbon nanotubes (MWCNTs) for the oxygen reduction reaction (ORR) both in acid and alkaline electrolytes. Here, three types of carbon nanotubes (CNTs) involving MWCNTs, MWCNTs-COOH (MWCNTs with carboxyl groups) and MWCNTs-OH (MWCNTs with hydroxyl groups) are investigated. Both CVs and RRDE results indicate that the order of ORR electrocatalytic activity and H2O selectivity is MWCNTs-COOH > MWCNTs-OH > MWCNTs in acid solution; while in alkaline medium, it is MWCNTs > MWCNTs-COOH > MWCNTs-OH. Furthermore, the ORR on these CNTs proceeds mainly through the two-electron reduction pathway followed by a gradual four-electron transfer reaction. Possible interpretation of the different ORR electrocatalytic activity and H2O selectivity in these two solutions is also discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 30, 13 October 2014, Pages 16964–16975
نویسندگان
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