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Research Papers

La0.8Sr0.2Co0.8Fe0.2O3 Nanoparticles Formed in Micropores of La0.8Sr0.2MnO3–Yttria Stabilized Zirconia Cathodes

[+] Author and Article Information
Q. S. Zhang, T. Matsumura, N. Imanishi, Y. Takeda

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

A. Hirano1

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

K. Yamahara

 Mitsubishi Chemicals, 4-14-1 Shiba, Minato-ku, Tokyo 106-0014, Japan

1

Corresponding author.

J. Fuel Cell Sci. Technol 6(1), 011010 (Nov 06, 2008) (4 pages) doi:10.1115/1.2971052 History: Received April 25, 2007; Revised March 16, 2008; Published November 06, 2008

La0.8Sr0.2Co0.8Fe0.2O3 (LSCF) nanoparticles are formed in micropores of La0.8Sr0.2MnO2(LSM)-yttria stabilized zirconia (YSZ) cathodes by reaction-infiltration method. Bismuth nitrate is added in the precursor nitrate solution for LSCF as the reaction promoter. The LSCF phase is observed at 600°C by the addition of bismuth nitrate, and about 100nm particle size LSCF(Bi) is homogenously distributed on the LSM-YSZ surface. The electrode impedance of LSM-YSZ/YSZ/LSM-YSZ cells is examined and has found that the electrode polarization resistance is extremely reduced by the LSCF(Bi) infiltration in LSM-YSZ. The performance of the anode support fuel cell of Ni-YSZ/YSZ/LSM-YSZ is examined at 700°C. The LSCF(Bi) infiltrated LSM-YSZ cathode significantly enhanced the cell performance with a 97%H2-3%H2 fuel at 700°C. The maximum power density of 0.35Wcm2 is attended.

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Figures

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Figure 1

Geometry of test cells: (a) symmetric LSM-YSZ/YSZ/LSM-YSZ cell, and (b) anode supported Ni-YSZ/YSZ/LSM-YSZ fuel cell

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Figure 2

DSC curves of a LSCF precursor solution at open air with heating rate 5°C∕min: (a) without Bi(NO3)3, and (b) with Bi(NO3)3

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Figure 3

SEM images of a LSM-YSZ cathode: (a) without LSCF(Bi), and (b) with LSCF(Bi)

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Figure 4

XRD patterns of the decomposition products of LSCF precursor solution at various temperatures: (a) without Bi(NO3)3, and (b) with Bi(NO3)3: (↓) La0.8Sr0.2Co0.8Fe0.2O3, ( *)Co3O4 and/or Fe3O4, (○) La2O3, (+) La0.176Bi0.824O1.5, and (#) Bi0.81Sr0.19O1.4

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Figure 5

Impedance plots of LSM-YSZ/YSZ/LSM-YSZ at 700°C and temperature dependence of the electrode polarization resistance Rp (◼) without LSCF(Bi), and (●) with LSCF(Bi)

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Figure 6

Current-cell voltage curves for Ni-YSZ/YSZ/LSM-YSZ at 700°C, (◼) without LSCF(Bi), and (●) with LSCF(Bi)

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Figure 7

Constant current (0.4Å∕cm2) discharge performance for Ni-YSZ/YSZ/LSCF(Bi) infiltrated LSM-YSZ at 700°C, fuel: 98%H2-3%H2O, oxidant: air

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