Preparation of carbon-supported perovskite-type oxides LaMn 1-y,FeyO3+δ based on reverse homogeneous precipitation method

Shin Imaizumi, Kengo Shimanoe, Yasutake Teraoka, Norio Miura, Noboru Yamazoe

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23 Citations (Scopus)

Abstract

Reverse homogeneous precipitation (RHP) method was successfully applied for dispersing perovskite type oxides LaMn1-yFeyO 3+δ (y = 0 - 0.8) finely on carbon support. Mixing the colloidal particles of about 10 nm in size obtained by RHP method with a 2-propanol dispersion of carbon black resulted in precipitation of a precursor/carbon composite, which was further converted into a LaMn 1-yFeyO3+δ oxide/carbon composite by calcination. Microscopic observation revealed that nano-sized oxide particles were dispersed fairly well in the carbon support. When applied to gas diffusion-type electrodes, the 30 mass % LaMnO3+δ/carbon composite thus prepared showed far more excellent oxygen reduction activity than the 50 mass % LaMnO3+δ/carbon composite conventionally prepared by mechanical mixing. The electrode gave current density as high as 300 mA cm-2 at -110 mV (vs. Hg/HgO) in 8 M KOH at 60°C under air flow. Oxygen reduction activity of the LaMn1-yFeyO 3+δ/carbon composites decreased with increasing y, though the composite at y = 0.4 was still more active than the LaMnO3.15 composite prepared conventionally by traditional way.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume151
Issue number10
DOIs
Publication statusPublished - Nov 26 2004

All Science Journal Classification (ASJC) codes

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

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