MnO 2/onion-like carbon nanocomposites for pseudocapacitors

Ye Wang, Siu Fung Yu, Cheng Yue Sun, Tie Jun Zhu, Hui Ying Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

76 Citations (Scopus)

Abstract

Manganese oxide (MnO 2)/onion-like carbon (OLC) nanocomposites have been synthesized by a hydrothermal method for application as the electrode material of pseudocapacitors. An asymmetric pseudocapacitor was composed of MnO 2/OLC nanocomposites as the working electrode and nickel foam as the counter electrode immersed in an aqueous Na 2SO 4 solution as the electrolyte is assembled. With the presence of OLC, the corresponding specific capacitance is improved from 27.5 to 177.5 F g -1 at 2 A g -1 current charge-discharge rate when compared to that of using pure MnO 2 as the working electrode. Furthermore, only 6.3% decrease of the specific capacitance is observed when the discharge rate is increased from 0.2 to 2 A g -1. Our MnO 2/OLC pseudocapacitors also exhibit a superior cycling stability of 99-101% retention of specific capacitance after 1000 cycles. The results exhibit great potential in developing quick-charge/slow-discharge supercapacitors for practical applications.
Original languageEnglish
Pages (from-to)17584-17588
Number of pages5
JournalJournal of Materials Chemistry
Volume22
Issue number34
DOIs
Publication statusPublished - 14 Sep 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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