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http://dx.doi.org/10.4191/KCERS.2007.44.1.740

Fabrication Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF)/Ce0.9Gd0.1O2−δ (GDC) and La0.6Ba0.4Co0.2Fe0.8O3−δ (LBCF)/Ce0.9Gd0.1O2−δ (GDC) Composite Cathodes for Intermediate Temperature Solid Oxide Fuel Cells  

Lee, Seung-Hun (School of Materials Science and Engineering, Inha University)
Yoon, Song-Seol (School of Materials Science and Engineering, Inha University)
Cha, Young-Chul (School of Materials Science and Engineering, Inha University)
Lee, Jun (School of Materials Science and Engineering, Inha University)
Hwang, Hae-Jin (School of Materials Science and Engineering, Inha University)
Moon, Ji-Woong (Korea Institute of Ceramic Enginerring and Technology, Energy & Applied Materials Laboratory)
Publication Information
Journal of the Korean Ceramic Society / v.44, no.12, 2007 , pp. 740-746 More about this Journal
Abstract
The potential candidates for IT-SOFCs cathode materials, $Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ (BSCF) and $La_{0.6}Ba_{0.4}Co_{0.2}Fe_{0.8}O_{3-{\delta}}$ (LBCF) powders, were synthesized by a EDTA-citrate combined method from $Sr(NO_3)_2$, $Ba(NO_3)_2$, $La(NO_3)_3{\cdot}6H_2O$, $Co(NO_3)_2{\cdot}6H_2O$, $Fe(NO_3)_3{\cdot}9H_2O$, citric acid and $EDTA-NH_3$. The cathode performance of symmetrical electrochemical cells consisting of BSCF-GDC or LBCF-GDC composite electrodes and a GDC electrolyte was investigated using by AC impedance spectroscopy at the temperature range of 500 to $700^{\circ}C$. It was found that a single phase perovskite could be successfully synthesized when the precursor is heated at $850^{\circ}C$ for 2 h. Due to thermal expansion mismatch between BSCF and GDC, the composite cathodes with lower GDC content than 45 wt% were peeled off from the GDC electrolyte and their electrode polarization resistance was estimated to be high. The thermal expansion coefficient of BSCF-GDC composites was decreased with increasing the GDC content and the electrode peeling off did not occur in BSCF-45 and 55 wt% GDC composites. BSCF-45 wt% GDC composite electrode showed the lowest area specific resistances (ASR) of 0.15 and $0.04{\Omega}{\cdot}cm^2$ at 600 and $700^{\circ}C$, respectively. On the other hand, LBCF-GDC composite cathodes showed higher ASR than the BSCF-45 and 55 wt% GDC and their cathode performance were decreased with the GDC content.
Keywords
Solid oxide fuel cell; BSCF; LBCF; Cathode; Perovskite; Mixed ionic and electronic conductor;
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1 E. Maguire, B. Gharbage, F. M. B. Maques, and J. A. Labrincha, 'Cathode Materials for Intermediate Temperature SOFCs,' Solid State Ionics, 127 [3-4] 329-35 (2000)   DOI   ScienceOn
2 H. Hayashi, M. Kanoh, C. J. Quan, H. Inaba, S. Wang, M. Dokiya, and H. Tagawa, 'Thermal Expansion of Gd-doped Ceria and Reduced Ceria,' Solid State Ionics, 132 227-33 (2000)   DOI   ScienceOn
3 W. Winkler and J. Koeppen, 'Design and Operation of Interconnectors for Solid Oxide Fuel Cell Stacks,' J. Power Sources, 61 [1-2] 201-04 (1996)   DOI   ScienceOn
4 T. Kadowaki, T. Shiomitsu, E. Matsuda, H. Nakagawa, H. Tsuneizumo, and T. Maruyama, 'Applicability of Heat Resisting Alloys to the Separator of Planar Type Solid Oxide Fuel Cell,' Solid State Ionics, 67 [1-2] 65-9 (1993)   DOI   ScienceOn
5 V. Dusastre and J. A. Kilner, 'Optimisation of Composite Cathodes for Intermediate Temperature SOFC Applications,' Solid State Ionics, 126 [1-2] 163-74 (1999)   DOI   ScienceOn
6 R. T. Leah, N. P. Brandon, and P. Aguiar, 'Modelling of Cells, Stacks and Systems Based Around Metal-supported Planar IT-SOFC Cells with CGO Electrolytes Operating at 500-$600^{\circ}C$,' J. Power Sources, 145 [2] 336-52 (2005)   DOI   ScienceOn
7 J. W. Fergus, 'Sealant for Solid Oxide Fuel Cells,' J. Power Sources, 147 [1-2] 46-57 (2005)   DOI   ScienceOn
8 F. L. Lowrie and R. D. Rawlings, 'Room and High Temperature Failure Mechanisms in Solid Oxide Fuel Cell Electolytes,' J. Eur. Ceram. Soc., 20 [6] 751-60 (2000)   DOI   ScienceOn
9 Z. Shao, W. Yang, Y. Cong, H. Dong, J. Tong, and G. Xiong, 'Investigation of the Permeation Behavior and Stability of a $Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ Oxygen Membrane,' J. Membrane Sci., 172 [1-2] 177-88 (2000)   DOI   ScienceOn
10 Z. Shao, G. Xiong, H. Dong, W. Yang, and L. Lin, 'Synthesis, Oxygen Permeation Study and Membrane Performance of a $Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ Oxygen-permeable Dense Ceramic Reactor for Partial Oxidation of Methane to Syngas,' Separation and Purification Technology, 25 [1-3] 97-116 (2001)   DOI   ScienceOn
11 J.-W. Moon, Y. H. Lim, Y. K. Oh, M. J. Lee, B. H. Choi, and H. J. Hwang, 'Polarization Resistance of $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ Air Electrode Synthesized by Glycine-nitrate Process (in Korean),' J. Kor. Ceram. Soc., 42 [12] 800-07 (2005)   과학기술학회마을   DOI   ScienceOn
12 Z. Duan, M. Yang, A. Yan, Z. Hou, Y. Dong, Y. Chong, M. Cheng, and W. Yang, '$Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ as a Cathode for IT-SOFCs with GDC Interlayer,' J. Power Sources, 160 [1] 57-64 (2006)   DOI   ScienceOn
13 Z. Shao and S. Haile, 'A High-performance Cathode for the Next Generation of Solid-oxide Fuel Cells,' Nature, 43 170-73 (2004)   DOI   ScienceOn
14 M. Gdickemeier, K. Sasaki, L. J. Gauckler, and I. Riess, 'Perovskite Cathodes for Solid Oxide Fuel Cells Based on Ceria Electrolytes,' Solid State Ionics, 86-88 [2] 691-701 (1996)   DOI   ScienceOn
15 Y. H. Lim, J. Lee, J. S. Yoon, C. E. Kim, and H. J. Hwang, 'Electrochemical Performance of $Ba_{0.5}Sr_{0.5}Co_xFe_{1-x}O_{3-{\delta}}$ (x =0.2- 0.8) Cathode on a ScSZ Electrolyte for Intermediate Temperature SOFCs,' J. Power Sources, 171 79-85 (2007)   DOI   ScienceOn
16 S. Li, W. Jin, N. Xu, and J. Shi, 'Oxygen Vacancy Concentration Variation, Diffusivity and Thermo-chemical Stability of $La_{0.2}Ba_{0.8}Co_{0.2}Fe_{0.8}O_{3-{\delta}}$ Membranes,' J. Mater. Sci., 35 4329-35 (2000)   DOI   ScienceOn
17 S. Lee, Y. H. Lim, E. A Lee, H. J. Hwang, and J.-W. Moon, '$Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ (BSCF) and $La_{0.6}Ba_{0.4}Co_{0.2}Fe_{0.8}O_{3-{\delta}}$ (LBCF) Cathodes Prepared by Combined Citrate-EDTA Method for IT-SOFCs,' J. Power Sources, 157 848-54 (2006)   DOI   ScienceOn
18 P. Zeng, Z. Chen, W. Zhou, H. Gu, Z. Shao, and S. Liu, 'Re-evaluation of $Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ Perovskite as Oxygen Semi-permeable Membrane,' J. Membrane Sci., 291 148-56 (2007)   DOI   ScienceOn
19 X. Li, Principles of Fuel Cells, pp. 477-506, Taylor & Francis Group, New york, 2006
20 H. Wang, Y. Cong, and W. Yang, 'Oxygen Permeation Study in a Tubular ^Ba_{0.5}Sr_{0.5}Co_{0.8}Fe_{0.2}O_{3-{\delta}}$ Oxygen Permeable Membrane,' J. Membrane Sci., 210 [2] 259-71 (2003)   DOI   ScienceOn