کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
59261 1419434 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Elucidation of oxygen reduction reaction pathway on carbon-supported manganese oxides
ترجمه فارسی عنوان
اکتشاف مسیر واکنش اکسیژن کاهش اکسیدهای منگنز با کربن
کلمات کلیدی
مسیر واکنش کاهش اکسیژن، الکترولیت قلیایی، الکتروکاتالیست حمایت شده از کربن، اکسید منگنز
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی

The oxygen reduction reaction (ORR) is a complex process. This is particularly the case for carbon-supported electrocatalysts in alkaline electrolytes, because carbon can catalyze the ORR via a two-electron transfer to generate hydroperoxide (HO2−), which subsequently undergoes either chemical decomposition to generate O2 and OH− (HODR) or electrochemical reduction to OH− (HORR). In this study, we elucidated the ORR pathway on a series of carbon-supported manganese oxides, which have been extensively studied as electrocatalysts in alkaline electrolytes. A comparison of the turnover frequencies of the HODR and HORR showed that although an apparent four-electron transfer process was identified when the HO2− yield was measured using the rotating ring disk electrode technique, the real ORR pathway involved a two-electron transfer process to generate HO2−, with subsequent chemical decomposition of HO2−. These results will help us to understand the intrinsic catalytic behavior of carbon-supported transition-metal oxides for the ORR in alkaline electrolytes.

Graphical AbstractThe real ORR pathway behind the apparent four-electron process on carbon-supported manganese oxides was shown to be a two-electron transfer reaction followed by hydroperoxide disproportionation.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chinese Journal of Catalysis - Volume 36, Issue 2, February 2015, Pages 175–180
نویسندگان
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