کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4767162 1424119 2017 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mesoporous MnO2 Nanosphere/Graphene Sheets as Electrodes for Supercapacitor Synthesized by a Simple and Inexpensive Reflux Reaction
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Mesoporous MnO2 Nanosphere/Graphene Sheets as Electrodes for Supercapacitor Synthesized by a Simple and Inexpensive Reflux Reaction
چکیده انگلیسی
The new electrode materials with large specific capacitance, cycling stability and high rate capability are important to advance the development of supercapacitors. A nanocomposite of mesoporous MnO2 nanospheres anchered reduced graphene oxide (MG) was synthesized by a simple and inexpensive reflux reaction. KMnO4 refluxed with oxalic acid as reducing agent was used to the growth of mesoporous MnO2 nanospheres on graphene oxide (GO). The MG as an electrode exhibits a specific capacitance of 466.7 F g−1 at a current density of 1 A g−1, which is 3.33 times larger than that of pure MnO2 (140 F g−1) and 3.19 times of graphene (146 F g−1). The rate capability arrives at 10 A g−1 with specific capacitance of 454.8 F g−1. The capacitance retention is 92% over 2000 cycles at 1 A g−1. The electrochemical impedance spectroscopy (EIS) demonstrates roles of mesopores and RGO in facilitating electronic transport and ionic diffusion across the pores and interfaces.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 238, 1 June 2017, Pages 30-35
نویسندگان
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