کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1523853 995331 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of redox deposition of birnessite-type MnO2 on activated carbon as high-performance electrode for hybrid supercapacitors
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Development of redox deposition of birnessite-type MnO2 on activated carbon as high-performance electrode for hybrid supercapacitors
چکیده انگلیسی

Birnessite-type MnO2/activated carbon nanocomposites have been synthesized by directly reducing KMnO4 with activated carbon in an aqueous solution. It is found that the morphologies of MnO2 grown on activated carbon can be tailored by varying the reaction ratio of activated carbon and KMnO4. An asymmetric supercapacitor with high energy density was fabricated by using MnO2/activated carbon (MnO2/AC) nanocomposite as positive electrode and activated carbon as negative electrode in 1 M Na2SO4 aqueous electrolyte. The asymmetric supercapacitor can be cycled reversibly in the cell voltage of 0–2 V, and delivers a specific capacitance of 50.6 F g−1 and a maximum energy density of 28.1 Wh kg−1 (based on the total mass of active electrode materials of 9.4 mg), which is much higher than that of MnO2/AC symmetric supercapacitor (9.7 Wh kg−1).


► Birnessite-type MnO2/AC nanocomposite is synthesized by a redox deposition process.
► The morphology of nanostructure MnO2 grown on the surface of AC can be tailored.
► An asymmetric supercapacitor is fabricated by using MnO2/AC and AC as electrodes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 137, Issue 1, 15 November 2012, Pages 290–296
نویسندگان
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