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Characterization and electrochemical properties of chromium-substituted pyrochlore Y2Ti2−x Cr x O7−δ

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Abstract

Pyrochlore oxides Y2Ti2−x Cr x O7−δ have been investigated as electrolyte for solid oxide fuel cell. The as-prepared powder was synthesized by sol–gel method and characterized by powder X-ray diffraction, scanning electron microscope/energy-dispersive spectroscopy, inductively coupled plasma atomic emission spectroscopy, temperature-programmed reduction and AC impedance. Y2Ti2−x Cr x O7−δ existed in single phase in a range of 0 < x ≤ 0.8, and the cell parameters decreased as the amount of Cr dopant increased. XPS analyses indicate that the average oxidation state of Crn+ ions decreased with the increased Cr content. Measurements of ionic conductivities induced that the optimized performance was observed at x = 0.2 with 0.01 S/cm at 700 °C due to an optimized condition of carrier concentration and carrier mobility.

Graphical Abstract

Y2Ti2−x Cr x O7−δ existed in single phase in a range of 0 < x ≤ 0.8 and the optimized performance of ionic conductivity was observed at x = 0.2 with 0.01 S/cm at 700 °C.

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Acknowledgments

This project was supported by MOE ATU program and National Science Council, Taiwan (NSC98-2113-M-009-007-MY3, 98-3114-E-009-006 and 99-3113-P-009-005).

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Authors and Affiliations

  1. Department of Applied Chemistry, National Chiao Tung University, 1001 University Rd., Hsinchu, 30010, Taiwan

    Chia-Kan Hao, Hao-En Hung & Chi-Shen Lee

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  1. Chia-Kan Hao
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  2. Hao-En Hung
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Correspondence to Chi-Shen Lee.

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Hao, CK., Hung, HE. & Lee, CS. Characterization and electrochemical properties of chromium-substituted pyrochlore Y2Ti2−x Cr x O7−δ . J Sol-Gel Sci Technol 76, 428–435 (2015). https://doi.org/10.1007/s10971-015-3791-4

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