A 2?V asymmetric supercapacitor based on reduced graphene oxide-carbon nanofiber-manganese carbonate nanocomposite and reduced graphene oxide in aqueous solution

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• 作者：B. Amutha ; M. Sathish
• 关键词：Asymmetric supercapacitors ; Nanocomposite ; Graphene ; Manganese carbonate ; Carbon nanofiber
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：19
• 期：8
• 页码：2311-2320
• 全文大小：4,467 KB
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• 作者单位：B. Amutha (1)
  M. Sathish (1)
  
  1. Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi, 630 006, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768

文摘

A 2?V asymmetric supercapacitor is developed using reduced graphene oxide-carbon nanofiber-MnCO3 nanocomposite (RGO-CNF-MnCO3) as positive electrode and RGO as negative electrode in a neutral 1?M Na2SO4 aqueous electrolyte. The RGO-CNF-MnCO3 composite positive electrode is prepared using hydrothermal method, and the X-ray diffraction (XRD) studies reveal the formation of crystalline rhodochrosite MnCO3 in the as-prepared nanocomposites. The electron microscopic images show the formation of MnCO3 nanoparticles on RGO-CNF surface in the nanocomposites. Fourier transform infrared (FT-IR) and Raman spectroscopic analyses confirm the existence of various functional groups in RGO-CNF-MnCO3 nanocomposite. RGO is prepared using modified Hummers and Offeman’s method. Cyclic voltammetry and galvanostatic charge–discharge experiments of symmetric RGO-CNF-MnCO3 and RGO cells show a poor energy density of 4.8 and 3.6?Wh/kg at 0.1?A/g, respectively. Cyclic voltammetry and galvanostatic charge–discharge experiments of asymmetric RGO//RGO-CNF-MnCO3 cell in aqueous 1?M Na2SO4 solution show the stability of asymmetric cell up to 2?V with a high energy density of 21?Wh/kg. The RGO//RGO-CNF-MnCO3 asymmetric cell shows excellent capacitance retention of 97?% even after 1000?cycles charge–discharge at 1?A/g. In addition, a high energy density of 15?Wh/kg is retained when the power density increases to 1.07?kW/kg for the asymmetric cell. The high energy density and stability of prepared asymmetric RGO//RGO-CNF-MnCO3 cell is promising for electrochemical energy storage in aqueous electrolyte.