کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5144479 | 1496865 | 2018 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Facile sonochemical synthesis of amorphous NiFe-(oxy)hydroxide nanoparticles as superior electrocatalysts for oxygen evolution reaction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this work, we present facile synthesis of amorphous Ni/Fe mixed (oxy)hydroxide (NiFe(H)) nanoparticles (NPs) and their electrocatalytic performance for oxygen evolution reaction (OER) in alkaline media. a-NiFe(H) NPs have received lots of attention as OER electrocatalysts with many desirable properties. By using a simple sonochemical route, we prepared amorphous Ni and Fe-alkoxide (NiFe(A)) NPs whose composition can be controlled in the entire composition range (Ni100âxFex, 0 â¤Â x â¤Â 1). These samples are composed of extremely small NiFe(A) NPs with Ni and Fe atoms homogeneously distributed. NiFe(A) NPs are readily converted into corresponding electrocatalytically active NiFe(H) NP by a simple electrochemical treatment. Electrochemical analysis data show that the OER activity of amorphous NiFe(H) samples follows the volcano-type trend when plotted against the Fe content. Ni70Fe30(H) sample showed the lowest overpotential of 292 mV at 10 mA cmâ2geo and the lowest Tafel slope of 30.4 mV decâ1, outperforming IrOx/C (326 mV, 41.7 mV decâ1). Our samples are highly durable based on the chronopotentiometry data at the current density of 10 mA cmâ2geo for 2 h which show that Ni70Fe30 sample maintains the steady-state potential, contrary to the time-varying IrOx/C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 40, Part A, January 2018, Pages 552-557
Journal: Ultrasonics Sonochemistry - Volume 40, Part A, January 2018, Pages 552-557
نویسندگان
Eunjik Lee, Ah-Hyeon Park, Hyun-Uk Park, Young-Uk Kwon,