Synthesis of Core-Shell Structured MnO2 Petal Nanosheet@Carbon Sphere Composites and Their Application as Supercapacitor Electrodes

Xiao Ping Chen, Jie Wen*, Chun Xia Zhao, Yun Tao Li, Ning Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A novel MnO2 petal nanosheet@carbon sphere core-shell structure was successfully fabricated by adjusting the quantity of the KMnO4 precursor employed during the in situ growth of MnO2 on the surface of carbon spheres via a facile hydrothermal method. In the presence of low KMnO4 contents, only MnOOH was generated. In contrast, upon increasing the quantity of KMnO4, δ-MnO2 nanorods and petal nanosheets were obtained, thereby allowing the formation of the core-shell structured δ-MnO2 petal nanosheet@carbon sphere composites. However, beyond a certain point, further increases in the KMnO4 content were unfavorable. Although, prepared MnO2/carbon sphere composites of different morphologies can be used for supercapacitors (SCs) electrode materials, we found that the core-shell structured MnO2 petal nanosheet@carbon sphere composites exhibited the optimal capacitance performances in all the composites. These composites exhibited an excellent specific capacitance of 231 F⋅g−1 under a current density of 0.5 A⋅g−1. Furthermore, they also demonstrated an impressive cycling stability. Indeed, after 1,000 cycles at 10 A⋅g−1, the MnO2 petal nanosheet@carbon spheres exhibited 96% of their initial capacitance in a 1 M Na2SO4 aqueous electrolyte. The synergistic effect between δ-MnO2 and the porous carbon spheres in the unique core-shell structured is responsible for the excellent cycle life.

Original languageEnglish (US)
Pages (from-to)9301-9307
Number of pages7
JournalChemistrySelect
Volume3
Issue number32
DOIs
StatePublished - Aug 31 2018

Keywords

  • MnO
  • SCs
  • carbon sphere
  • core-shell structure
  • hydrothermal

ASJC Scopus subject areas

  • Chemistry(all)

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