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Research Papers

LSM Cathodes Infiltrated With Er2O3 Stabilized Bi2O3

[+] Author and Article Information
Q. S. Zhang, A. Hirano, N. Imanishi

Department of Chemistry, Faculty of Engineering, Mie University, Kurimamachiya-cho, Tsu 514-8507, Japan

Y. Takeda1

Department of Chemistry, Faculty of Engineering, Mie University, Kurimamachiya-cho, Tsu 514-8507, Japantakeda@chem.mie-u.ac.jp

K. Yamahara

 Mitsubishi Chemical Corporation, 4-14-1 Shiba, Minato-ku, Tokyo, 108-0014, Japan

1

Corresponding author.

J. Fuel Cell Sci. Technol 6(1), 011001 (Nov 03, 2008) (5 pages) doi:10.1115/1.2971021 History: Received January 19, 2007; Revised February 28, 2007; Published November 03, 2008

The La0.8Sr0.2MnO3 perovskite oxide (LSM) electrode was infiltrated with Er2O3 stabilized Bi2O3 (ESB) to improve the cathode performance of intermediate temperature solid oxide fuel cells. ESB infiltration was carried out by dropping the nitrate solution of Bi(NO3)3 and Er(NO3)3 (80:20mol ratio) on the LSM electrode surface prepared on yttria stabilized zirconia by screen-printing technique. The electrode performance of the infiltrated LSM electrode was studied by electrochemical impedance spectroscopy (EIS) analysis in open air. The EIS results showed that the electrode resistance was drastically decreased by the infiltration of Bi(NO3)3Er(NO3)3 solution into the LSM electrode; the electrode resistance was as low as 2.31Ωcm2 for the infiltration LSM cathode at 600°C, which was compared with 380Ωcm2 for the noninfiltrated LSM cathode. The low electrode resistance could be explained by the formation of high oxide ion conductivity Er2O3-doped Bi2O3 on the LSM particles.

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Figures

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Figure 6

Arrhenius plots of the polarization resistance of the (a) LSM-YSZ-ESB electrode and (b) the LSM-YSZ electrode

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Figure 7

Fuel cell performances with the LSM-YSZ cathode and the LSM-YSZ-EBS cathode at 700°C

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Figure 8

Impedance plot of the cell with the LSM-YSZ cathode and the LSM-YSZ-ESB cathode at 700°C

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Figure 5

Impedance plots of the LSM-ESB electrode: (a) 600°C, (b) 650°C, (c) 700°C, (d) 750°C, and (e) 800°C

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Figure 4

Impedance plots of the LSM electrodes: (a) 600°C, (b) 650°C, (c) 700°C, (d) 750°C, and (e) 800°C

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Figure 3

SEM images of (a) the LSM electrode and (b) the LSM-ESB electrode

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Figure 2

XRD patterns of LSM and LSM-ESB: (a) LSM, (b) LSM-ESB annealed at 600°C, and (c) LSM-ESB annealed at 800°C

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Figure 1

Test cell structure: (a) symmetric cell and (b) anode supported cell

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