Oxygen reduction activity of carbon-supported La1-xCa xMn1-yFeyO3 nanoparticles

Masayoshi Yuasa, Naoki Tachibana, Kengo Shimanoe

研究成果: ジャーナルへの寄稿学術誌査読

28 被引用数 (Scopus)

抄録

Carbon-supported La1-xCaxMn1-yFe yO3 nanoparticles were synthesized, and their oxygen reduction activities and electronic states were investigated. A reverse micelle method using KMnO4 as a source of high valence state Mn successfully yielded carbon-supported La1-xCaxMn1-yFe yO3 nanoparticles even when calcined under a reducing atmosphere. The oxygen reduction activity of carbon-supported La 1-xCaxMn1-yFeyO3 exceeded that of carbon-supported Pt nanoparticles when the Ca composition was limited to the range of 0.4 to 0.8. X-ray photoelectron spectroscopy (XPS) measurements of La1-xCaxMn1-yFeyO3 particle surfaces revealed the existence of Mn4+, which is important in the oxygen reduction activity. Depth analysis of La1-xCa xMn1-yFeyO3 nanoparticles by XPS revealed the formation of a CaCO3 impurity and an A-site deficient perovskite-type oxide containing a high surface concentration of Mn 4+.

本文言語英語
ページ(範囲)3072-3079
ページ数8
ジャーナルChemistry of Materials
25
15
DOI
出版ステータス出版済み - 8月 13 2013

!!!All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 化学工学(全般)
  • 材料化学

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