Co-electrodeposition of MnO2/graphene oxide coating on carbon paper from phosphate buffer and the capacitive properties

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• 作者：Hua Zhao (1)
  Feifei Liu (1)
  Gaoyi Han (1)
  Zhaoyang Liu (1)
  Bin Liu (1)
  Dongying Fu (1)
  Yanping Li (1)
  Miaoyu Li (1)
  
• 关键词：Graphene oxide ; MnO2 ; Electrodeposition ; Capacitor ; Carbon materials
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：18
• 期：2
• 页码：553-559
• 全文大小：393 KB
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• 作者单位：Hua Zhao (1)
  Feifei Liu (1)
  Gaoyi Han (1)
  Zhaoyang Liu (1)
  Bin Liu (1)
  Dongying Fu (1)
  Yanping Li (1)
  Miaoyu Li (1)
  
  1. Institute of Molecular Science, Key Laboratory of Chemical Biology and Molecular Engineering of Education Ministry, Shanxi University, Taiyuan, 030006, China
  
• ISSN：1433-0768

文摘

MnO2/graphene oxide sheet composite (MnO2/GOS) has been co-electrodeposited on the thermally treated carbon paper (TTCP) in phosphate buffer solution containing GOS and KMnO4. The resulted samples have been characterized by scanning and transmission electron microscopy, Raman, X-ray diffraction, and X-ray photoelectron energy spectroscopy. The results show that the synthesized MnO2 may be δ-MnO2 and the morphology of MnO2/GOS is very different from that of MnO2, indicating that the introduction of GOS in electrolyte can influence the morphology during the deposition. The capacitive properties of the samples are investigated by using cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The specific capacitance of MnO2 for MnO2/GOS can reach about 829?F?g? at discharged current density of 1.0?A?g? in 1?M Na2SO4 aqueous solution, which is larger than that of MnO2 deposited on TTCP. The composite of MnO2/GOS also exhibits excellent cyclic stability with a decrease of 18.5?% specific capacitance after 1,500?cycles.