Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications

Sang Bok Ma, Kyung Wan Nam, Won Sub Yoon, Xiao Qing Yang, Kyun Young Ahn, Ki Hwan Oh, Kwang Bum Kim

Research output: Contribution to journalArticle

243 Citations (Scopus)

Abstract

Birnessite-type manganese dioxide (MnO2) is coated uniformly on carbon nanotubes (CNTs) by employing a spontaneous direct redox reaction between the CNTs and permanganate ions (MnO4-). The initial specific capacitance of the MnO2/CNT nanocomposite in an organic electrolyte at a large current density of 1 A g-1 is 250 F g-1. This is equivalent to 139 mAh g-1 based on the total weight of the electrode material that includes the electroactive material, conducting agent and binder. The specific capacitance of the MnO2 in the MnO2/CNT nanocomposite is as high as 580 F g-1 (320 mAh g-1), indicating excellent electrochemical utilization of the MnO2. The addition of CNTs as a conducting agent improves the high-rate capability of the MnO2/CNT nanocomposite considerably. The in situ X-ray absorption near-edge structure (XANES) shows improvement in the structural and electrochemical reversibility of the MnO2/CNT nanocomposite after heat-treatment.

Original languageEnglish
Pages (from-to)483-489
Number of pages7
JournalJournal of Power Sources
Volume178
Issue number1
DOIs
Publication statusPublished - 2008 Mar 15

Fingerprint

Carbon Nanotubes
Manganese oxide
manganese oxides
energy storage
Electrochemical properties
Energy storage
Carbon nanotubes
carbon nanotubes
Nanocomposites
nanocomposites
Capacitance
capacitance
conduction
Redox reactions
X ray absorption
electrode materials
manganese oxide
dioxides
Electrolytes
Manganese

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Ma, Sang Bok ; Nam, Kyung Wan ; Yoon, Won Sub ; Yang, Xiao Qing ; Ahn, Kyun Young ; Oh, Ki Hwan ; Kim, Kwang Bum. / Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications. In: Journal of Power Sources. 2008 ; Vol. 178, No. 1. pp. 483-489.
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Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications. / Ma, Sang Bok; Nam, Kyung Wan; Yoon, Won Sub; Yang, Xiao Qing; Ahn, Kyun Young; Oh, Ki Hwan; Kim, Kwang Bum.

In: Journal of Power Sources, Vol. 178, No. 1, 15.03.2008, p. 483-489.

Research output: Contribution to journalArticle

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AU - Yoon, Won Sub

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AU - Oh, Ki Hwan

AU - Kim, Kwang Bum

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