Electrodeposited manganese oxides on three-dimensional carbon nanotube substrate: Supercapacitive behaviour in aqueous and organic electrolytes

Kyung Wan Nam, Chang Wook Lee, Xiao Qing Yang, Byung Won Cho, Won Sub Yoon, Kwang Bum Kim

Research output: Contribution to journalArticle

155 Citations (Scopus)

Abstract

Thin amorphous manganese oxide layers with a thickness of 3-5 nm are electrodeposited on a carbon nanotube (CNT) film substrate that has a three-dimensional nanoporous structure (denoted as MnO2/CNT electrode). For the purpose of comparison, manganese oxide films are also electrodeposited on a flat Pt-coated Si wafer substrate (denoted as MnO2 film electrode). The pseudocapacitive properties of the MnO2 film and MnO2/CNT electrodes are examined in both aqueous electrolyte (1.0 M KCl) and non-aqueous organic electrolyte (1.0 M LiClO4 in propylene carbonate). While both types of electrode show pseudocapacitive behaviour in the aqueous electrolyte, only the MnO2/CNT electrode does so in the organic electrolyte, due to its high oxide/electrolyte interfacial area and improved electron conduction through the CNT substrate. Compared with the MnO2 film electrode, the MnO2/CNT electrode shows a much higher specific capacitance and better high-rate capability, regardless of the electrolyte used. Use of the organic electrolyte results in a ∼6 times higher specific energy compared with that obtained with the aqueous electrolyte, while maintaining a similar specific power. The construction of a three-dimensional nanoporous network structure consisting of a thin oxide layer on a CNT film substrate at the nm scale and the use of an organic electrolyte are promising approaches to improving the specific energy of supercapacitors.

Original languageEnglish
Pages (from-to)323-331
Number of pages9
JournalJournal of Power Sources
Volume188
Issue number1
DOIs
Publication statusPublished - 2009 Mar 1

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Carbon Nanotubes
Manganese oxide
manganese oxides
Electrolytes
Carbon nanotubes
carbon nanotubes
electrolytes
Substrates
Electrodes
electrodes
Oxides
manganese oxide
oxides
electrochemical capacitors
propylene
conduction electrons
Oxide films
Propylene
oxide films
Carbonates

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

Nam, Kyung Wan ; Lee, Chang Wook ; Yang, Xiao Qing ; Cho, Byung Won ; Yoon, Won Sub ; Kim, Kwang Bum. / Electrodeposited manganese oxides on three-dimensional carbon nanotube substrate : Supercapacitive behaviour in aqueous and organic electrolytes. In: Journal of Power Sources. 2009 ; Vol. 188, No. 1. pp. 323-331.
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Electrodeposited manganese oxides on three-dimensional carbon nanotube substrate : Supercapacitive behaviour in aqueous and organic electrolytes. / Nam, Kyung Wan; Lee, Chang Wook; Yang, Xiao Qing; Cho, Byung Won; Yoon, Won Sub; Kim, Kwang Bum.

In: Journal of Power Sources, Vol. 188, No. 1, 01.03.2009, p. 323-331.

Research output: Contribution to journalArticle

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