• 文献标题:   Mesoporous MnO2 Nanosphere/Graphene Sheets as Electrodes for Supercapacitor Synthesized by a Simple and Inexpensive Reflux Reaction
  • 文献类型:   Article
  • 作  者:   YAO J, PAN QJ, YAO SS, DUAN LM, LIU JH
  • 作者关键词:   nanocomposite, graphene, manganese dioxide, supercapacitor
  • 出版物名称:   ELECTROCHIMICA ACTA
  • ISSN:   0013-4686 EI 1873-3859
  • 通讯作者地址:   Inner Mongolia Univ Nationalities
  • 被引频次:   15
  • DOI:   10.1016/j.electacta.2017.02.153
  • 出版年:   2017

▎ 摘  要

The new electrode materials with large specific capacitance, cycling stability and high rate capability are important to advance the development of supercapacitors. A nanocomposite of mesoporous MnO2 nanospheres anchered reduced graphene oxide (MG) was synthesized by a simple and inexpensive reflux reaction. KMnO4 refluxed with oxalic acid as reducing agent was used to the growth of mesoporous MnO2 nanospheres on graphene oxide (GO). The MG as an electrode exhibits a specific capacitance of 466.7 F g (1) at a current density of 1 A g (1), which is 3.33 times larger than that of pure MnO2 (140 F g (1)) and 3.19 times of graphene (146 F g (1)). The rate capability arrives at 10 A g (1) with specific capacitance of 454.8 F g (1). The capacitance retention is 92% over 2000 cycles at 1 A g (1). The electrochemical impedance spectroscopy (EIS) demonstrates roles of mesopores and RGO in facilitating electronic transport and ionic diffusion across the pores and interfaces. (C) 2017 Elsevier Ltd. All rights reserved.