Nanocomposites of hierarchical ultrathin MnO 2 nanosheets/hollow carbon nanofibers for high-performance asymmetric supercapacitors

Peng Zhao, Mengqi Yao, Hongbo Ren, Ni Wang, Sridhar Komarneni

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


A novel hierarchical hollow nanostructure composed of δ-MnO 2 nanosheets deposited by in-situ growth on hollow carbon nanofibers (MnO 2 /HCNFs) was facilely synthesized using the hydrothermal method. Benefitting from its distinctive hollow structure, nanocomposite of MnO 2 /HCNFs exhibited an enhanced electrochemical property with higher specific capacitance (293.6 F g −1 at 0.5 A g −1 in 1 M Na 2 SO 4 electrolyte) compared to non-hollow structure. Further, an asymmetric supercapacitor (ASC) coin cell was assembled with the MnO 2 /HCNFs nanocomposites (positive electrode) and KOH-activated porous carbon nanofibers (PCNFs) (negative electrode). The asymmetric supercapacitor coin cell exhibited a maximum specific capacitance of 63.9 F g −1 at a high operating voltage window up to 2 V. Moreover, the ASC coin cell possessed a high energy density of 35.1 Wh kg −1 and showed a remarkable cycling stability and only 8.9% capacitance loss was found after 10,000 cycles, which implied the practicability for energy storage.

Original languageEnglish (US)
Pages (from-to)931-938
Number of pages8
JournalApplied Surface Science
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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