Process dependent graphene/MnO2 composites for supercapacitors
作者： Myeongjin Kim , Yongseon Hwang , Jooheon Kim
DOI: 10.1016/J.CEJ.2013.06.095
关键词:
摘要: Abstract Two types of graphene/MnO 2 composites were synthesized by different reaction procedures. S1 was as follows: first, nanoneedle MnO formed on the GO sheets using various functional groups (GO/MnO ). In second stage, GO/MnO reduced to (S1) via dipping method. S2 a order: graphene oxide and sheets. The morphology microstructure as-prepared characterized X-ray diffractometery, field-emission scanning electron microscopy, photoelectron spectroscopy, thermogravimetric analysis. Characterization indicated that structures in composite homogeneously dispersed sheets, whereas aggregates due absence groups. capacitive properties electrodes measured cyclic voltammetry, galvanostatic charge/discharge tests, electrochemical impedance spectroscopy three-electrode experimental setup with an aqueous solution 1 M Na SO 4 electrolyte. electrode exhibited specific capacitance high 327.5 F g −1 at 10 mV s , which higher than (229.9 F g It is anticipated formation surface following reduction procedure could be promising fabrication method for supercapacitor electrodes.
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