Synthesis and Characterization of Co-doped CeO2 Ceramic Electrolyte for IT-SOFC

Document Type : Research Paper


1 Department of Energy System Engineering, Kahramanmaras İstiklal University, Kahramanmaras/Turkey

2 Institute of Science, Material Science and Engineering, 1KahramanmaraşSütçü İmam University,Kahramanmaraş, 46050, Turkey


Solid oxide fuel cells are electrochemical systems. One of the most important compounds in their structure is the ceramic electrolyte. The ceramic electrolyte property of the CeO2 compound is currently being investigated in many studies. In this study, we tried to synthesize different CeO2 compounds. Ce0.85-x-yLaxGdyO2 nanocrystalline powders were prepared via the hydrothermal method. Phases identification was completed through X-ray diffraction, SEM-EDS, thermal and impedance analysis. XRD data showed that all the obtained powders had a cubic fluorite structure. After examining the surface images, it was seen that the particle sizes were on the micron scale. Impedance measurements of the pelletized sample were also made. The Ce0.85-x-yLaxGdyO2 powder was sintered at 1250 °C. Increased conductivity value was calculated with increasing temperature. The best conductivity was observed at 750 oC and the conductivity value was 0.0022 The results indicated that the degree of electrical conductivity was found to be low regarding the applications in intermediate temperature solid oxide fuel cells.


Main Subjects

[1] Ramadhanı F., et al. “Optimization strategies for Solid Oxide Fuel Cell (SOFC) application: A literature survey”, Renewable and Sustainable Energy Reviews, 2017, 76:460.
[2] Yamamoto O., “Solid oxide fuel cells: fundamental aspects and prospects”, Electrochimica Acta, 2000, 45.15-16: 2423.
[3] Kirubakaran A., Jain S., Nema R. K. “A review on fuel cell technologies and power electronic interface”, Renewable and Sustainable Energy Reviews, 2009, 13.9: 2430.
[4] Haile S. M. “Fuel cell materials and components”,Acta Materialia, 2003, 51.19: 5981.
[5] Dudek M., “ Ceramic oxide electrolytes based on CeO2-preparation, properties and possibility of application to electrochemical devices”, Journal of the European ceramic society, 2008, 28.5: 965.
[6] Hayashi K., et al. “Solid oxide fuel cell stack with high electrical efficiency”, NTT Technical Review, NTT Energy and Environment Systems Laboratories, Japan, 2009.
[7] Williams M. C., Application of power electronics with the US DOE distributed generation programme, Int. J. Energy Technology and Policy, 2007.
[8] Ahmadi R., Pourfatemi SM.,Ghaffari S. “Exergoeconomic optimization of hybrid system of GT, SOFC and MED implementing genetic algorithm”. Desalination, 2017, 411: 76.
[9] Minh N.Q. “Solid oxide fuel cell technology-features and applications”, Solid State Ionics, 2004, 174.1-4: 271.
[10] Kwak SC., Kim B.K., Kim D. I., Cho Y.W “Pulsed Electrodeposition of Thin Cobalt Coating Layer on Ferritic Stainless Steel for SOFC Interconnects” Korean Journal of Metals and Materials, 2017, 55(11): 768.
[11] Morales M., Roa J.J., Tartaj J., Segarra, M. “A review of doped lanthanum gallates as electrolytes for intermediate temperature solid oxides fuel cells: From materials processing to electrical and thermo-mechanical properties”. Journal of the European Ceramic Society, 2016. 36(1): 1.
[12] Gómez S. Y., Hotza D. “Current developments in reversible solid oxide fuel cells”, Renewable and Sustainable Energy Reviews, 2016, 61: 155.
[13] Mahato N., et al. “ Progress in material selection forsolid oxide fuel cell technology: A review” ,Progress in Materials Science, 2015, 72: 141.
[14] Hui S. R., et al. “A brief review of the ionic conductivity enhancement for selected oxide electrolytes”, Journal of Power Sources, 2007, 172.2: 493.
[15] Steele B. C. H. “ Materials for IT-SOFC stacks: 35 years R&D: the inevitability of gradualness”, Solid state ionics, 2000, 134.1-2: 3-2.
[16] Figueiredo F. M. L., Marques F. M. B. “Electrolytes for solid oxide fuel cells”, Wiley Interdisciplinary Reviews: Energy and Environment, 2013, 2.1: 52.
[17] Rahaman M. N. Sintering of ceramics. CRC press, 2007.
[18] Devi P. S., Banerjee S. “ Search for new oxide-ion conducting materials in the ceria family of oxides” Ionics, 2008, 14.1: 73.
[19] Sun Q., Fu Z., Yang Z. “ Effects of rare-earth doping on the ionic conduction of CeO2 in solid oxide fuel cells” Ceramics International, 2018, 44.4: 3707.
[20] Molenda, J., Świerczek, K., Zając, W. “Functional materials for the IT-SOFC”. Journal of Power Sources, 2007, 173.2: 657.
[21] Pikalova E. Y., et al. “Solid electrolytes based on CeO2 for medium-temperature electrochemical devices” Russian Journal of Electrochemistry, 2011, 47.6: 690.
[22] Jin H., et al. “Synthesis and conductivity of cerium oxide nanoparticles” Materials Letters, 2010, 64.11: 1254.
[23] Ou D.R., Mori T., Ye F., Zou J., Drennan J. “Comparison between Y-doped ceria and Ho-doped ceria: Electrical conduction and microstructures. Renewable Energy”, 2008, 33(2):  197.
[24] Omar S., et al. “Crystal structure–ionic conductivity relationships in doped ceria systems”, Journal of theAmerican Ceramic Society, 2009, 92.11: 2674.
[25] Chou C., Huang  C., Yeh T. “ Investigation of ionic conductivities of CeO2-based electrolytes with controlled oxygen vacancies”, Ceramics International, 2013, 39: 627.
[26] Bošković S.B., et al. “Doped and Co-doped CeO2: Preparation and properties”, Ceramics international, 2008, 34.8: 2001.
[27] Kobi S., Jaiswal N., Kumar D., Parkash O. “Ionic conductivity of Nd3+ and Y3+ co-doped ceria solid electrolytes for intermediate temperature solid oxide fuel cells”. Journal of Alloys and Compounds, 2016, 58: 513.
[28] Rushton M. J. D., Chroneos A. “ Impact of uniaxial strain and doping on oxygen diffusion in CeO2”, Scientific reports, 2014, 4: 6068.
[29]Tadokoro S.K., Muccillo E. N.S. “Effect of Y and Dy co-doping on electrical conductivity of ceria ceramics”, Journal of the European Ceramic Society, 2007, 27(13-15): 4261.