Synthesis of Nano-Structured La0.6Sr0.4Co0.2Fe0.8O3 Perovskite by Co-Precipitation Method

Document Type : Research Paper

Authors

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 14395-553, Tehran, Iran

Abstract

Nano-structured lanthanum strontium cobalt ferrite, La0.6Sr0.4Co0.2Fe0.8O3 (LSCF), was successfully synthesized via co-precipitation method using metal nitrates as starting materials. Effects of precipitating agent and calcination temperature on the phase composition and morphology of synthesized powders were systematically studied using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), respectively. XRD analysis revealed that a single phase La0.6Sr0.4Co0.2Fe0.8O3 perovskite was obtained in the processed sample using ammonium carbonate as precipitating agent with a NH4+/NO3-molar ratio of 2 after calcination at 1000C for 1 h. The phase composition of products was also affected by changing pH values. Moreover, using sodium hydroxide as a precipitant resulted in a mixture of La0.6Sr0.4Co0.2Fe0.8O3 and cobalt ferrite (CoFe2O4) phases. Careless washing of the precursors can also led to the formation of mixed phase after calcination of final powders. Mean crystallite size of the obtained powders was not noticeably affected by varying calcination temperature from 900 to 1050C and remained almost the same at 10 nm, however increasing calcination temperature to 1100C resulted in sharp structural coarsening. FESEM studies demonstrate that relatively uniform particles with mean particle size of 90 nm were obtained in the sample processed with a NH4+/NO3- molar ratio of 2 after calcination at 1000C for 1 h.

Keywords

References

[1]. M. Pena and J. Fierro, "Chemical structures and performance of perovskite oxides," Chemical Reviews, vol. 101, pp. 1981-2018, 2001.
[2]. B. C. Steele and A. Heinzel, "Materials for fuel-cell technologies," Nature, vol. 414, pp. 345-352, 2001.
[3]. J. Mirzababaei and S. S. Chuang, "La0. 6Sr0. 4Co0. 2Fe0. 8O3 Perovskite: A Stable Anode Catalyst for Direct Methane Solid Oxide Fuel Cells," Catalysts, vol. 4, pp. 146-161, 2014.
[4]. N. Q. Minh, "Solid oxide fuel cell technology—features and applications," Solid State Ionics, vol. 174, pp. 271-277, 2004.
[5]. Y. Teraoka, H.-M. Zhuang, S. Furukawa, and N. Yamazoe, "Oxygen permeation through perovskite-type oxides," Chemistry Letters, pp. 1743-1746, 1985.
[6]. S. Jiang, "A comparison of O2 reduction reactions on porous (La, Sr) MnO3 and (La, Sr)(Co, Fe)O3 electrodes," Solid State Ionics, vol. 146, pp. 1-22, 2002.
[7]. 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, pp. 3110-3115, 2004.
[8]. 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, vol. 29, pp. 2003-2011, 2009.
[9]. 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, vol. 1, pp. 50-56, 2010.
[10] . V. Uskoković and M. Drofenik, "Four novel co-precipitation procedures for the synthesis of lanthanum-strontium manganites," Materials & design, vol. 28, pp. 667-672, 2007.
[11]. B. L. Cushing, V. L. Kolesnichenko, and C. J. O'Connor, "Recent advances in the liquid-phase syntheses of inorganic nanoparticles," Chemical reviews, vol. 104, pp. 3893-3946, 2004.
[12]. 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, vol. 25, pp. 601-604, 2007.
[13]. A. S. Aricò, P. Bruce, B. Scrosati, J.-M. Tarascon, and W. Van Schalkwijk, "Nanostructured materials for advanced energy conversion and storage devices," Nature materials, vol. 4, pp. 366-377, 2005.
[14]. M. S. Toprak, M. Darab, G. E. Syvertsen, and M. Muhammed, "Synthesis of nanostructured BSCF by oxalate co-precipitation–As potential cathode material for solid oxide fuels cells," International journal of hydrogen energy, vol. 35, pp. 9448-9454, 2010.
[15]. B. D. Cullity and S. R. Stock, Elements of X-ray Diffraction vol. 3: Prentice hall Upper Saddle River, NJ, 2001.
[16] . W. Zhou, Z. Shao, and W. Jin, "Synthesis of nanocrystalline conducting composite oxides based on a non-ion selective combined complexing process for functional 
applications," Journal of Alloys and Compounds, vol. 426, pp. 368-374, 2006.
[17]. J. Yu, W. Ma, and H. Wang, "Preparation of perovskite-type oxides La1-XSrXFe1-YCoYO3 using EDTA sol-gel method," Journal of Rare Earths, vol. 22, pp. 766-770, 2004.
[18]. Z. Taheri, B. Ghanbari, and H. Hajibabaei, "Synthesis, characterization, and application of a new tripodal ligand for the preparation of LSCF (6482) perovskite," Chemical Papers, vol. 68, pp. 989-994, 2014.
[19]. M. Rashad, E. Elsayed, M. Moharam, R. Abou-Shahba, and A. Saba, "Structure and magnetic properties of NixZn1-xFe2O4 nanoparticles prepared through co-precipitation method," Journal of Alloys and Compounds, vol. 486, pp. 759-767, 2009.
[20] . V. Pillai and D. Shah, "Synthesis of high-coercivity cobalt ferrite particles using water-in-oil microemulsions," Journal of Magnetism and Magnetic Materials, vol. 163, pp. 243-248, 1996.
[21]. M. Montazeri-Pour and A. Ataie, "Low temperature crystallization of barium ferrite nano-particles via co-precipitation method using diethylene glycol," International Journal of Modern Physics B, vol. 22, pp. 3144-3152, 2008.
[22] . Y. Zeng, Y. Lin, and S. Swartz, "Perovskite-type ceramic membrane: synthesis, oxygen permeation and membrane reactor performance for oxidative coupling of methane," Journal of membrane science, vol. 150, pp. 87-98, 1998.
[23] . 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, vol. 180, pp. 1285-1289, 2009.
[24] . 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, vol. 177, pp. 3211-3216, 2006.
Journal of Ultrafine Grained and Nanostructured Materials
Volume 48, Issue 1 - Serial Number 1
Spring & Summer
June 2015
Pages 45-52

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History

  • Receive Date: 01 December 2014
  • Revise Date: 17 January 2015
  • Accept Date: 01 March 2015

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