Mechanical alloying preparation of La0.6Ca 0.4CoIr0.25O3.5-δ as a bifunctional electrocatalyst in alkaline electrolyte

Yun Min Chang; Pu-Wei Wu; Cheng Yeou Wu; Yi Fan Hsieh; Jing Yu Chen

doi:10.1149/1.2835200

Mechanical alloying preparation of La_0.6Ca _0.4CoIr_0.25O_3.5-δ as a bifunctional electrocatalyst in alkaline electrolyte

Yun Min Chang^*, Pu-Wei Wu, Cheng Yeou Wu, Yi Fan Hsieh, Jing Yu Chen

^*Corresponding author for this work

Department of Materials Science and Engineering

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

12 Scopus citations

Abstract

La0.6 Ca0.4 CoIr0.25 O3.5-δ was prepared by a mechanical alloying process from mixtures of La0.6 Ca0.4 CoO3 and IrO2. Scanning electron microscopy images on the resulting powders exhibited particles with irregular shape at 300-500 nm in size. X-ray diffraction analysis confirmed formation of a perovskite with complete disappearance of rutile signals from IrO2, indicating successful incorporation of Ir4+ at the Co3+ sites. Supported on carbon nanocapsules, the La0.6 Ca0.4 CoIr0.25 O3.5-δ demonstrated superior performance over those of La0.6 Ca0.4 CoO3 in both charging and discharging current density-voltage polarizations. In addition, galvanostatic charging and discharging measurements at 25 and 100 mA/ cm2 indicated that the electrocatalytic abilities of La0.6 Ca0.4 CoIr0.25 O3.5-δ are stable and sustainable.

Original language	English
Journal	Electrochemical and Solid-State Letters
Volume	11
Issue number	4
DOIs	https://doi.org/10.1149/1.2835200
State	Published - 22 Feb 2008

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@article{979c7b86deb74b92990ed273793b38cb,

title = "Mechanical alloying preparation of La0.6Ca 0.4CoIr0.25O3.5-δ as a bifunctional electrocatalyst in alkaline electrolyte",

abstract = "La0.6 Ca0.4 CoIr0.25 O3.5-δ was prepared by a mechanical alloying process from mixtures of La0.6 Ca0.4 CoO3 and IrO2. Scanning electron microscopy images on the resulting powders exhibited particles with irregular shape at 300-500 nm in size. X-ray diffraction analysis confirmed formation of a perovskite with complete disappearance of rutile signals from IrO2, indicating successful incorporation of Ir4+ at the Co3+ sites. Supported on carbon nanocapsules, the La0.6 Ca0.4 CoIr0.25 O3.5-δ demonstrated superior performance over those of La0.6 Ca0.4 CoO3 in both charging and discharging current density-voltage polarizations. In addition, galvanostatic charging and discharging measurements at 25 and 100 mA/ cm2 indicated that the electrocatalytic abilities of La0.6 Ca0.4 CoIr0.25 O3.5-δ are stable and sustainable.",

author = "Chang, {Yun Min} and Pu-Wei Wu and Wu, {Cheng Yeou} and Hsieh, {Yi Fan} and Chen, {Jing Yu}",

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journal = "Electrochemical and Solid-State Letters",

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T1 - Mechanical alloying preparation of La0.6Ca 0.4CoIr0.25O3.5-δ as a bifunctional electrocatalyst in alkaline electrolyte

AU - Chang, Yun Min

AU - Wu, Pu-Wei

AU - Wu, Cheng Yeou

AU - Hsieh, Yi Fan

AU - Chen, Jing Yu

PY - 2008/2/22

Y1 - 2008/2/22

N2 - La0.6 Ca0.4 CoIr0.25 O3.5-δ was prepared by a mechanical alloying process from mixtures of La0.6 Ca0.4 CoO3 and IrO2. Scanning electron microscopy images on the resulting powders exhibited particles with irregular shape at 300-500 nm in size. X-ray diffraction analysis confirmed formation of a perovskite with complete disappearance of rutile signals from IrO2, indicating successful incorporation of Ir4+ at the Co3+ sites. Supported on carbon nanocapsules, the La0.6 Ca0.4 CoIr0.25 O3.5-δ demonstrated superior performance over those of La0.6 Ca0.4 CoO3 in both charging and discharging current density-voltage polarizations. In addition, galvanostatic charging and discharging measurements at 25 and 100 mA/ cm2 indicated that the electrocatalytic abilities of La0.6 Ca0.4 CoIr0.25 O3.5-δ are stable and sustainable.

AB - La0.6 Ca0.4 CoIr0.25 O3.5-δ was prepared by a mechanical alloying process from mixtures of La0.6 Ca0.4 CoO3 and IrO2. Scanning electron microscopy images on the resulting powders exhibited particles with irregular shape at 300-500 nm in size. X-ray diffraction analysis confirmed formation of a perovskite with complete disappearance of rutile signals from IrO2, indicating successful incorporation of Ir4+ at the Co3+ sites. Supported on carbon nanocapsules, the La0.6 Ca0.4 CoIr0.25 O3.5-δ demonstrated superior performance over those of La0.6 Ca0.4 CoO3 in both charging and discharging current density-voltage polarizations. In addition, galvanostatic charging and discharging measurements at 25 and 100 mA/ cm2 indicated that the electrocatalytic abilities of La0.6 Ca0.4 CoIr0.25 O3.5-δ are stable and sustainable.

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