Process dependent graphene/MnO2 composites for supercapacitors

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[1] Kim, Myeongjin
[2] Hwang, Yongseon
[3] Kim, Jooheon
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Kim, J. (jooheonkim@cau.ac.kr) | 1600年 / Elsevier B.V., Netherlands卷 / 230期
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Two types of graphene/MnO2 composites were synthesized by different reaction procedures. S1 was synthesized as follows: first; nanoneedle MnO2 was formed on the GO sheets using various functional groups (GO/MnO2). In the second stage; GO/MnO2 was reduced to graphene/MnO2 (S1) via the dipping method. S2 was synthesized using a different reaction order: first; graphene oxide was reduced to graphene and nanoneedle MnO2 was formed on graphene sheets. The morphology and microstructure of the as-prepared composites were characterized by X-ray diffractometery; field-emission scanning electron microscopy; X-ray photoelectron spectroscopy; and thermogravimetric analysis. Characterization indicated that the nanoneedle MnO2 structures in the S1 composite were homogeneously dispersed on graphene sheets; whereas MnO2 in the S2 composite formed aggregates due to absence of functional groups. The capacitive properties of S1 and S2 electrodes were measured using cyclic voltammetry; galvanostatic charge/discharge tests; and electrochemical impedance spectroscopy in a three-electrode experimental setup with an aqueous solution of 1M Na2SO4 as the electrolyte. The S1 electrode exhibited a specific capacitance as high as 327.5Fg-1at 10mVs-1; which was higher than that of the S2 electrode (229.9Fg-1). It is anticipated that the formation of nanoneedle MnO2 on the GO surface following the reduction procedure could be a promising fabrication method for supercapacitor electrodes. © 2013 Elsevier B.V;
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