La0.6Sr0.4Co0.2Fe0.8O3 perovskite cathode for Intermediate Temperature Solid Oxide Fuel Cells: A comparative study

Document Type: Research Paper


School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran


In this study the characteristics of two different kinds of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) powders, one in-house synthesized powder by a co-precipitation method and another one purchased from Fuel Cell Materials Co. (FCM Co., USA), were compared. The co-precipitated powder was prepared by using ammonium carbonate as precipitant with a NH4+/NO3- molar ratio of 2 and calcination at 1000C for 1 h. Phase composition, morphology and particle size distribution of powders were systematically studied using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and laser particle size analysis (LPSA), respectively. The synthesized and commercial LSCF powders were overlaid on Yttria-stabilized zirconia (YSZ) electrolyte having a gadolinium-doped ceria (GDC) interlayer. Electrochemical Impedance Spectroscopy (EIS) measurement was carried out at various operating temperatures in the range of 600-850C. XRD and FESEM analysis revealed that single phase nano-crystalline LSCF powder with a mean crystallite size of 14 nm and mean particle size of 90 nm is obtained after calcination at 1000C. The presence of hard agglomerated particles larger than few microns in the commercial powder and also sub-micron agglomerates in the co-precipitated LSCF powder might be related to the final mechanical milling process and high calcination temperature of powders, respectively. LPSA results show identical mean particle size of about 1.5μm for both LSCF powders. EIS results revealed almost identical polarization resistance for both LSCF powders.


Main Subjects

[1]        B. C. Steele and A. Heinzel, "Materials for fuel-cell technologies," Nature, 2001, 414: 345.

[2]        J. Fergus, R. Hui, X. Li, D. P. Wilkinson, and J. Zhang, Solid oxide fuel cells: materials properties and performance: CRC press, 2008.

[3]        W.-H. Kim, H.-S. Song, J. Moon, and H.-W. Lee, "Intermediate temperature solid oxide fuel cell using (La,Sr)(Co,Fe)O3 based cathodes," Solid State Ionics, 2006, 177: 3211.

[4]        M. Pena and J. Fierro, "Chemical structures and performance of perovskite oxides," Chemical reviews, 2001, 101: 1981.

[5]        T. Ishihara, Perovskite oxide for solid oxide fuel cells, vol. 16: Springer, 2009.

[6]        N. Mahato, A. Banerjee, A. Gupta, S. Omar, and K. Balani, "Progress in material selection for solid oxide fuel cell technology: A review," Progress in Materials Science, 2015, 72: 141.

[7]        J. Richter, P. Holtappels, T. Graule, T. Nakamura, and L. J. Gauckler, "Materials design for perovskite SOFC cathodes," Monatshefte für Chemie-Chemical Monthly, 2009, 140: 985.

[8]        N. Q. Minh, "Solid oxide fuel cell technology—features and applications," Solid State Ionics, 2004, 174: 271.

[9]        Y. Teraoka, H.-M. Zhuang, S. Furukawa, and N. Yamazoe, "Oxygen permeation through perovskite-type oxides," Chemistry Letters, 1985, 14: 1743.

[10]      S. Jiang, "A comparison of O2 reduction reactions on porous (La,Sr)MnO3 and (La,Sr)(Co,Fe)O3 electrodes," Solid State Ionics, 2002, 146: 1.

[11]      R. A. Richardson, J. W. Cotton, and R. M. Ormerod, "Influence of synthesis route on the properties of doped lanthanum cobaltite and its performance as an electrochemical reactor for the partial oxidation of natural gas," Dalton Transactions, 2004, 19: 3110.

[12]      A. Dutta, J. Mukhopadhyay, and R. N. Basu, "Combustion synthesis and characterization of LSCF-based materials as cathode of intermediate temperature solid oxide fuel cells," Journal of the European Ceramic Society, 2009, 29: 2003.

[13]      L. Nie, Z. Liu, M. Liu, L. Yang, Y. Zhang, and M. Liu, "Enhanced Performance of La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) Cathodes with Graded Microstructure Fabricated by Tape Casting," Journal of Electrochemical Science and Technology, 2010, 1: 50.

[14]      Z. Junwu, S. Xiaojie, W. Yanping, W. Xin, Y. Xujie, and L. Lude, "Solution-Phase Synthesis and Characterization of Perovskite LaCoO3 Nanocrystals via A Co-Precipitation Route," Journal of Rare Earths, 2007, 25: 601.

[15]      S. P. Jiang and S. H. Chan, "A review of anode materials development in solid oxide fuel cells," Journal of Materials Science, 2004, 39: 4405.

[16]      E. P. Murray, M. Sever, and S. Barnett, "Electrochemical performance of (La,Sr)(Co,Fe) O3–(Ce,Gd)O3 composite cathodes," Solid State Ionics, 2002, 148: 27.

[17]      K. T. Lee and E. D. Wachsman, "Role of nanostructures on SOFC performance at reduced temperatures," MRS Bulletin, 2014, 39: 783.

[18]      T. E. Burye and J. D. Nicholas, "Improving La0.6Sr0.4Co0.8Fe0.2O3−δ infiltrated solid oxide fuel cell cathode performance through precursor solution desiccation," Journal of Power Sources, 2015, 276: 54.

[19]      Z. Duan, M. Yang, A. Yan, Z. Hou, Y. Dong, Y. Chong, et al., "Ba0.5Sr0.5Co0.8Fe0.2O3-δ as a cathode for IT-SOFCs with a GDC interlayer," Journal of power sources, 2006, 160: 57.

[20]      A. Mai, V. A. Haanappel, F. Tietz, and D. Stöver, "Ferrite-based perovskites as cathode materials for anode-supported solid oxide fuel cells: part II. Influence of the CGO interlayer," Solid State Ionics, 2006, 177: 2103.

[21]      E. Mostafavi, A. Babaei, and A. Ataie, "Synthesis of Nano-Structured La0.6Sr0.4Co0.2Fe0.8O3 Perovskite by Co-Precipitation Method," Journal of Ultrafine Grained and Nanostructured Materials, 2015, 48: 45.

[22]      A. Babaei, L. Zhang, E. Liu, and S. P. Jiang, "Performance and stability of La0.8Sr0.2MnO3 cathode promoted with palladium based catalysts in solid oxide fuel cells," Journal of Alloys and Compounds,  2011, 509: 4781.

[23]      J. Chen, et al., "Palladium and ceria infiltrated La0.8Sr0.2Co0.5Fe0.5O3-[delta] cathodes of solid oxide fuel cells," Journal of Power Sources, 2009, 194: 275.

[25]      M. Sahibzada, S. Benson, R. Rudkin, and J. Kilner, "Pd-promoted La0.6Sr0.4Co0.2Fe 0.8O3 cathodes," Solid State Ionics, 1998, 113: 285.

[26]      X. Lou, S. Wang, Z. Liu, L. Yang, and M. Liu, "Improving La0.6Sr0.4Co0.2Fe0.8O3−δ cathode performance by infiltration of a Sm0.5Sr0.5CoO3−δ coating," Solid State Ionics, 2009, 180: 1285.