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

Masayoshi Yuasa; Naoki Tachibana; Kengo Shimanoe

doi:10.1021/cm401276y

Oxygen reduction activity of carbon-supported La_1-xCa _xMn_1-yFe_yO₃ nanoparticles

Masayoshi Yuasa, Naoki Tachibana, Kengo Shimanoe

Functional Materials Science

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

Carbon-supported La_1-xCa_xMn_1-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 La_1-xCa_xMn_1-yFe _yO₃ nanoparticles even when calcined under a reducing atmosphere. The oxygen reduction activity of carbon-supported La _1-xCa_xMn_1-yFe_yO₃ 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 La_1-xCa_xMn_1-yFe_yO₃ particle surfaces revealed the existence of Mn⁴⁺, which is important in the oxygen reduction activity. Depth analysis of La_1-xCa _xMn_1-yFe_yO₃ 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⁺.

Original language	English
Pages (from-to)	3072-3079
Number of pages	8
Journal	Chemistry of Materials
Volume	25
Issue number	15
DOIs	https://doi.org/10.1021/cm401276y
Publication status	Published - Aug 13 2013

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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title = "Oxygen reduction activity of carbon-supported La1-xCa xMn1-yFeyO3 nanoparticles",

abstract = "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+.",

author = "Masayoshi Yuasa and Naoki Tachibana and Kengo Shimanoe",

year = "2013",

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doi = "10.1021/cm401276y",

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journal = "Chemistry of Materials",

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T1 - Oxygen reduction activity of carbon-supported La1-xCa xMn1-yFeyO3 nanoparticles

AU - Yuasa, Masayoshi

AU - Tachibana, Naoki

AU - Shimanoe, Kengo

PY - 2013/8/13

Y1 - 2013/8/13

N2 - 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+.

AB - 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+.

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Oxygen reduction activity of carbon-supported La_1-xCa _xMn_1-yFe_yO₃ nanoparticles

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