کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
178640 459310 2016 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Unprecedented dependence of the oxygen reduction activity on Co content at Pt Skin/Pt–Co(111) single crystal electrodes
ترجمه فارسی عنوان
وابستگی بی سابقه فعالیت کاهش اکسیژن بر روی ماده Co در Pt Skin / Pt-Co (111) الکترودهای تک بلوری
کلمات کلیدی
آلومینیوم Pt-Co؛ کریستال تک لایه پوست Pt؛ واکنش کاهش اکسیژن؛ دوار الکترود دیسک
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Pt-skin/Pt–Co(111) single crystals exhibited extremely high ORR activity, jk.
• Pt-skin had atomically flat terraces with the same atomic arrangement as the bulk.
• Maximum jk at Pt-skin/Pt0.75Co0.25 was 25 times higher than that at pure Pt(111).
• The enhanced ORR activity cannot be explained by decreased OH poisoning.
• An alternate ORR model must be developed to explain all of the present results.

The kinetically controlled area-specific activities, jk, for the oxygen reduction reaction (ORR) were evaluated at well-defined Pt-skin/Pt100 − xCox(111) single crystal electrodes as a function of Co content by use of the rotating disk electrode method. The Pt-skin layer formed by annealing under a pure H2 atmosphere was clarified to consist of atomically flat terraces with the same atomic arrangement as the underlying crystal. At 25 atom%-Co, the jk value reached a maximum as high as 3.0 mA cm− 2 at 0.9 V vs. RHE, which is ca. 25 times larger than that on pure Pt(111). Such an enhanced ORR activity of Pt-skin/Pt–Co(111) electrodes cannot be explained on the basis of decreased OH poisoning, because the surface oxidation charge densities measured at 0.9 V in N2-purged solution were nearly constant.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 67, June 2016, Pages 47–50
نویسندگان
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