کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6607804 | 459536 | 2016 | 34 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The impact of electrochemical reduction potentials on the electrocatalytic activity of graphene oxide toward the oxygen reduction reaction in an alkaline medium
ترجمه فارسی عنوان
تأثیر پتانسیل کاهش الکتروشیمیایی بر فعالیت الکتریکی کاتالیزوری اکسید گرافین نسبت به واکنش کاهش اکسیژن در یک محیط قلیایی
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کلمات کلیدی
گرافین، اکسید گرافین کاهش الکتروشیمیایی، پتانسیل کاهش، واکنش کاهش اکسیژن، کاهش الکتروشیمیایی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
We report the synthesis of graphene via the electrochemical reduction of graphene oxide (GO). In this study, GO nanosheets from aqueous dispersion were pre-assembled on a glassy carbon (GC) electrode and then electrochemically reduced in 1Â M KOH under various constant reduction potentials in the range of â0.6Â V to â1.5Â V (vs. Ag/AgCl). X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy analyses revealed that the graphitic structure was substantially restored in the resulting electrochemically reduced graphene oxide (ERGO). The ERGO electrodes exhibited significantly enhanced catalytic activity toward the oxygen reduction reaction (ORR) in an alkaline medium compared with the initial GO electrode. Of the ERGO electrodes produced at various cathodic potentials, the ERGO-1.2Â V electrode, which was produced at a reduction potential of â1.2Â V, demonstrated the best catalytic activity toward the ORR in an alkaline medium. The ORR on GO and ERGO electrodes was shown to proceed via a two-electron mechanism at low overpotentials. The agreement between the spectroscopy results and electrochemical measurements provide strong evidence that the enhanced ORR catalytic activity is mainly attributed to the restoration of GO's graphitic structure. Furthermore, the ERGO-1.2Â V electrode showed excellent tolerance to the methanol poisoning effect compared with a Pt/C catalyst electrode.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 199, 1 May 2016, Pages 194-203
Journal: Electrochimica Acta - Volume 199, 1 May 2016, Pages 194-203
نویسندگان
Shaw Yong Toh, Kee Shyuan Loh, Siti Kartom Kamarudin, Wan Ramli Wan Daud,