کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6472155 | 1424126 | 2017 | 10 صفحه PDF | دانلود رایگان |
We report the simple one-step synthesis of a reduced graphene oxide-manganese oxide (rGO-MnO2) nanocomposite using graphene oxide (GO) and KMnO4 in the presence of sulfuric acid. The crystal structure, morphology, thermal, pore size, and other physical properties of the rGO-MnO2 nanocomposite were systematically analyzed by X-ray diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller analysis. XPS analysis confirmed the synthesis of exfoliated GO and rGO-MnO2 nanocomposite. The rGO-MnO2 nanocomposite exhibited a maximum specific capacitance, energy, and power density of 290 F gâ1, 25.7 Wh kgâ1, and 8008.7 W kgâ1, respectively, in a 1M Na2SO4 electrolyte, and a high retention (87.5%) of capacitance after 5000 cycles. The enhanced electrochemical properties are caused by good contact between MnO2 nanorods and graphene nanosheets, and the higher conductive and capacitive behavior of graphene.
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Journal: Electrochimica Acta - Volume 231, 20 March 2017, Pages 749-758