Reverse micelle assisted dispersion of lanthanum manganite on carbon support for oxygen reduction cathode

Masahiko Hayashi, Hiromi Uemura, Kengo Shimanoe, Norio Miura, Noboru Yamazoe

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

It was tried to disperse LaMnO3+δ oxide finely on carbon black support through a reverse micelle (RM) method using poly(oxyethylene)5 nonylphenyl ether (surfactant), and cyclohexane (solvent). An RM dispersion containing a nanosized precursor of the oxide [RM (C)] was prepared by mixing an RM dispersion containing nitrates of constituent metals [RM (A)] with another dispersion containing N(CH3)4OH. RM (C) was easily destabilized with the addition of ethanol to deposit the precursor, which was converted to hexagonal oxide (LaMnO3.15) or orthorhombic oxide (LaMnO3.00) by calcination in air or N2, respectively. Carbon black powder was mixed at various stages of these preparation procedures. Among the resulting carbon-supported oxide powders, the one for which the carbon black was suspended into RM (A) was found to give an outstanding cathodic activity: It allowed current density as high as 300 mA cm-2 at -80 mV (vs. Hg/HgO) in 8 M KOH at 60°C under air flow. Transmission electron microscope observation revealed that fine dispersion of the oxide particles in the carbon matrix is the origin of such high activity.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume151
Issue number1
DOIs
Publication statusPublished - Feb 16 2004

Fingerprint

Lanthanum
Micelles
Cathodes
Oxides
Carbon
Oxygen
Soot
Carbon black
Powders
Cyclohexane
Air
manganite
Surface-Active Agents
Nitrates
Ether
Calcination
Ethers
Surface active agents
Ethanol
Current density

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Reverse micelle assisted dispersion of lanthanum manganite on carbon support for oxygen reduction cathode. / Hayashi, Masahiko; Uemura, Hiromi; Shimanoe, Kengo; Miura, Norio; Yamazoe, Noboru.

In: Journal of the Electrochemical Society, Vol. 151, No. 1, 16.02.2004.

Research output: Contribution to journalArticle

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