MnCo2O4@nitrogen-doped carbon nanofiber composites with meso-microporous structure for high-performance symmetric supercapacitors

Ning Cai, Jing Fu, Vincent Chan, Mingming Liu, Weimin Chen, Jianzhi Wang, Huan Zeng, Faquan Yu

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

The electrochemical properties of carbon nanofibers for supercapacitor application should be improved to meet the requirement of renewable energy systems. Herein we investigate the effect of MnCo2O4 on the electrochemical properties of carbon nanofibers. Nitrogen-doped carbon nanofibers incorporated with MnCo2O4 nanoparticles are synthesized by carbonizing manganese-cobalt@polyacrylonitrile nanofibers under N2 atmosphere. The composite electrode-based symmetric supercapacitor at an optimum loading of 1/2 mmol has an excellent specific capacitance of 871.5 F g−1 (at a current density of 0.5 A g−1), presents an ultra-high energy density of 30.26 Wh kg−1 and delivers an excellent cycle performance (retention rate of 89.3% after 5000 cycles). The outstanding electrochemical properties of composite electrode are mainly attributed to the doping of nitrogen and the introduction of MnCo2O4 into carbon matrix. The adoption of PAN is aimed to produce the doped nitrogen in carbon bulk, which can generate pseudocapacitance and improve the electrical conductivity of carbon nanofibers. The introduction of MnCo2O4 results in the formation of meso-microporous structure in CNFs, which facilitates the rapid and efficient transfer of charges into the electrode material. Besides, MnCo2O4 is an active material for pseudocapacitors that can undergo redox reaction during charge/discharge process, thus enhancing the electrochemical performance of carbon nanofibers.

Original languageBritish English
Pages (from-to)251-262
Number of pages12
JournalJournal of Alloys and Compounds
Volume782
DOIs
StatePublished - 25 Apr 2019

Keywords

  • Carbon nanofiber
  • Meso-microporous structure
  • MnCoO
  • Nitrogen doping
  • Symmetric supercapacitor

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