کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6612240 459583 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nitrogen-doped graphene supported highly dispersed palladium-lead nanoparticles for synergetic enhancement of ethanol electrooxidation in alkaline medium
ترجمه فارسی عنوان
گرافن دوتایی نیتروژن از نانوذرات پلاسمای سرب به شدت پراکنده برای افزایش نیروی الکترو اکسیداسیون اتانول در محیط قلیایی حمایت می کند
کلمات کلیدی
گرافن دارای دوام نیتروژن، کاتالیست دوتایی پالادیوم سرب، قلیایی محیط، اکسیداسیون اتانول،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
In this work, a series of palladium and palladium-lead nanoparticles supported on active carbon, graphene and nitrogen-doped graphene are synthesized via a one-step reduction method. Atomic absorption spectroscopy, X-ray powder diffraction, transmission electron microscope and X-ray photoelectron spectroscopy are used to characterize the catalysts. The results indicate that metal nanoparticles are more uniformly dispersed on the surface of N-doped graphene than those on graphene, without any aggregation. Various electrochemical techniques are carried out to evaluate the electrocatalytic ethanol oxidation activity and durability. The peak current for ethanol electrooxidation of Pd/N-doped graphene increases to 70.2 mA cm−2, obviously higher than that of Pd/Graphene (38.0 mA cm−2) and even surpasses that of Pd/C (51.9 mA cm−2). N-doped graphene support not only possesses faster dehydrogenation but provides an electron effect to Pd. Introduction of Pb into the catalyst causes the formation of abundant oxygenated species on the catalyst surface at low potential. Based on the synergistic effect of N and Pb towards Pd particles, the PdPb/N-doped graphene catalyst (Pd:Pb = 8:1.0) exhibits remarkably enhanced activity up to 152.3 mA cm−2 for ethanol oxidation, which is 4.0 and 2.9 times higher than that of Pd/Graphene and Pd/C, respectively. The catalytic durability and stability are also greatly improved.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 152, 10 January 2015, Pages 68-74
نویسندگان
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