کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1286075 1497942 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hybrid of porous cobalt oxide nanospheres and nitrogen-doped graphene for applications in lithium-ion batteries and oxygen reduction reaction
ترجمه فارسی عنوان
ترکیبی از نانوسفرهای اکسید متخلخل کبالت و گرافن دوتایی نیتروژن برای کاربرد در باتری های لیتیوم یون و واکنش کاهش اکسیژن
کلمات کلیدی
اکسید کبالت، گرافن دارای دوام نیتروژن، نانوکامپوزیت ها، باتری های لیتیوم یون، کاهش اکسیژن، الکترو کاتالیزورها
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• A complex precursor is developed from graphite oxide, Co2+ and melamine resin (MR).
• Hybrid of porous Co3O4 nanospheres and N-doped graphene (Co3O4/NG) is achieved.
• MR is beneficial to promote uniform N-doping and distribution of Co3O4.
• The Co3O4/NG hybrid exhibits superb Li-ion storage performances.
• The Co3O4/NG hybrid shows excellent catalytic activity toward oxygen reduction.

A new single-source precursor has been developed from the hydrothermal reaction of graphite oxide (GO), melamine resin (MR) monomers, and CoCl2 to prepare a sandwich-like hybrid of ultrathin nitrogen-doped graphene (NG) sheets and porous Co3O4 nanospheres (Co3O4/NG). This unique structure endows the Co3O4/NG hybrid with large surface area and enhanced electrochemical performances as both anode material for Li-ion batteries and electrocatalyst for oxygen reduction reaction (ORR). As an anode material, it exhibits high reversible capacity, excellent cycling stability and rate performance (1236 and 489 mAh g−1 over 200 cycles at 0.1C and 2C, respectively; 371 mAh g−1 at 5C). As an ORR electrocatalyst, it shows superior catalytic activity and high selectivity for the four-electron reduction pathway compared to the bare Co3O4 and NG alone. Moreover, the Co3O4/NG hybrid is insensitive to methanol, and is much more stable than Pt/C catalyst over long term operation.

A new single-source precursor was developed from the hydrothermal reaction of graphite oxide, melamine resin monomers and CoCl2 to prepare a sandwich-like Co3O4/NG hybrid consisted of ultrathin nitrogen-doped graphene (NG) sheets and porous Co3O4 nanospheres. The Co3O4/NG hybrid possessed hierarchal pores, large surface area, high conductive network, and thus exhibited enhanced electrochemical performances as anode materials for Li-ion batteries and electrocatalysts for oxygen reduction reaction.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 290, 20 September 2015, Pages 25–34
نویسندگان
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