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Research Papers

Synthesis of La0.8 Sr0.2 Co0.8 Fe0.2 O3 Nanopowders and Their Application in Solid Oxide Fuel Cells

[+] Author and Article Information
Changsheng Ding

Hongfei Lin

Fracture and Reliability Research Institute,  Tohoku University, Sendai 980-8579, Japan

Kazuhisa Sato

Institute of Multidisciplinary Research for Advanced Materials,  Tohoku University, Sendai 980-8577, Japan

Toshiyuki Hashida

Fracture and Reliability Research Institute, Tohoku University, Sendai 980-8579, Japan

J. Fuel Cell Sci. Technol 8(5), 051016 (Jun 29, 2011) (4 pages) doi:10.1115/1.4004176 History: Received January 18, 2011; Revised April 12, 2011; Accepted May 03, 2011; Published June 29, 2011; Online June 29, 2011

La0.8 Sr0.2 Co0.8 Fe0.2 O3 (LSCF) nanopowders, which are being investigated as a promising cathode material for low-temperature solid oxide fuel cells (SOFCs), were synthesized by citric acid gel combustion method. The LSCF nanopowders synthesized at 700°C are single perovskite phases and have an average particle size of less than 30 nm. In order to evaluate the use of the synthesized LSCF nanopowders as cathode material of low-temperature SOFCs, anode-supported SOFCs were fabricated from the synthesized LSCF nanopowders and tested in the conditions of humidified hydrogen for anode and oxygen for cathode. The anode-supported single cell with the LSCF cathode sintered at 700°C showed high electrical performance with the maximum power density of 771 mW cm−2 at 600°C. The results show that the synthesized LSCF nanopowders are suitable to be applied as cathode material for low-temperature SOFCs.

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References

Figures

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Figure 1

TG and DTA curves of the citrate gel precursor

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Figure 2

XRD patterns of the LSCF powders synthesized at different temperatures

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Figure 3

SEM micrographs of the LSCF nanopowders synthesized at (a) 700°C for 2 h, (b) 900°C for 2 h, and (c) 1100°C for 2 h

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Figure 4

I-V and I-P characteristics of the single cells with the LSCF cathodes sintered at (a) 700°C for 2 h and (b) 900°C for 2 h

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Figure 5

SEM micrographs of the LSCF cathodes sintered at (a) 700°C and (b) 900°C

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