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Effect of Ti substitution on the electrochemical properties of LaCr1−x Ti x O3+0.5x (x = 0–0.15)

  • Original Paper: Sol-gel and hybrid materials for energy, environment and building applications
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Abstract

Perovskite compound LaCr1−x Ti x O3+0.5x (x = 0–0.15) was synthesized from an EDTA-chelating precursor solution at T < 800 °C, a temperature lower than that of the conventional solid-state method. Structural properties were determined at room temperature using X-ray powder diffraction and the lattice parameter decreased with increasing proportion of Ti. LaCr1−x Ti x O3+0.5x was chemically stable under a H2 atmosphere at 900 °C. Both electrical and ionic conductivity increased with increasing proportion of doped Ti, indicative of a p-type semiconductor. An Arrhenius-like behavior was observed, and the optimized bulk electrical conductivity was 0.107 S cm−1 for LaCr0.85Ti0.15O3.075 at 850 °C. X-ray photoelectron spectra indicate that the effect of the concentration of charge carrier on conductivity is closely related to the oxidation states of ions. The maximum power density reaches as high as 210 mW cm−2 at 800 °C for SOFC with LaCr1−x Ti x O3+0.5x (x = 0.15) anode.

Graphical Abstract

Ti-substituted perovskite materials LaTi x Cr1−x O3+0.5x (x = 0–0.15) show enhanced electronic and ionic conductivity with increasing proportion of doped Ti.

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Acknowledgments

National Science Council (NSC98-3114-E-009-006, 99-3113-P-009-005) and the MOE ATU program supported this research.

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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, Chia-Fen Tsai & Chi-Shen Lee

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  1. Chia-Kan Hao
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  2. Chia-Fen Tsai
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  3. Chi-Shen Lee
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Correspondence to Chi-Shen Lee.

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Hao, CK., Tsai, CF. & Lee, CS. Effect of Ti substitution on the electrochemical properties of LaCr1−x Ti x O3+0.5x (x = 0–0.15). J Sol-Gel Sci Technol 78, 394–402 (2016). https://doi.org/10.1007/s10971-015-3951-6

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  • DOI: https://doi.org/10.1007/s10971-015-3951-6

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