Department of Materials Engineering, University of Technology, Baghdad, Iraq


In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 ( and it was 0.214( of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.


Main Subjects

[1] B. Basu, K.Balani, “Advanced structural ceramics,” John Wiley & Sons, 1st ed, Canada, 2011.
[2] M. Prakasam, S. Valsan, Y. Lu, F. Balima, W. Lu, R. Piticescu and A. Largeteau, “Nanostructured pure and doped zirconia: syntheses and sintering for SOFC and optical applications,”1st ed., UK, Ch.5, pp.85-105, 2018.
[3] J. J. Swab, “Role of oxide additives in stabilizing zirconia for coating applications,” Army Research Laboratory, Aberdeen Proving Ground, MD USA, Rep. ARL TR-2591, 2001.
[4] P. Sharma, K. L. Singh, and A. P. Singh, “A Study on the Present Status of Zirconia based Electrolytes for Solid Oxide Fuel Cell,” Research & Reviews: Journal of Pure and Applied Physics, Vol. 4, No 3, pp.23-26, 2016.
[5] H. J. Hong, “Study of Sc-doped CaTiO3 as a new electrolyte candidate material for solid oxide fuel cells,” Ph.D. Thesis, Environmental study, Tohoku univ., Tohoku , Japan, 2015.
[6] M. Irshad, K. Siraj, R. Raza, A. Ali, P. Tiwari, B. Zhu, A. Rafique, A. Ali, M. K. Ullah, and A. Usman, “A brief description of high temperature solid oxide fuel cell’s operation, Materials, Design, Fabrication Technologies and Performance,” Applied Sc. [Online], 6(75),pp.1-23,2016.Available: / 2076-3417/6/3/75
[7] A. Kirubakaran, S. Jain, R. K. Nema, “A review on fuel cell technologies and power electronics interface,” Renewable and Sustainable Energy Reviews, [Online], Vol. 13, No. 9, pp.2430-2440, 2009. Available:
[8] C. Sikalidis, “Advances in ceramics - synthesis and characterization, processing and specific applications,” In Tech, Croatia, 1st ed., 2011.
[9] C. Sun, R. Hui, J. Roller, “Cathode materials for solid oxide fuel cells: a review,” The Journal of Solid State Electrochem, [Online], 14, 7, pp.1125–1144, 2010. Available:
[10] S. P. S. Badwal, “Stability of solid oxide fuel cell components,” Solid State Ionics, [Online], 143, pp. 39-46, 2001.Available:
[11] A. S. Kumar, R. Balaji, and S. Jayakumar, “Effect of dopant on improving structural, density and functional properties of ceria based SOFC electrolyte, Int. J. Nanosci. Nanotechnol., [Online], 15, 1, pp. 37–44, 2019. Available:
[12] A. Tarancon, “Strategies for lowering solid oxide fuel cells operating temperature,” Energies, [Online], 2, 9, pp.1130-1150,2009. Available:
[13] H. Yoshioka, H. Mieda, T. Funahashi, A. Mineshige, T. Yazawa, R. Mori, “Fabrication of apatite-type lanthanum silicate films and anode supported solid oxide fuel cells using nano-sized printable paste,” Journal of the European ceramic society,” [Online], 34, pp.373-379, 2014. Available:
[14] W. Zhou, F. Liang, Z. shao, and Z. Zhu, “Hierarchical CO2-protective shell for highly efficient oxygen reduction reaction,” sci. reports, [Online], Vol. 2, No. 327, pp.1-6, 2012. Available:
[15] B.C. Yang, J. Koo, J.W. Shin, D. Go, J.H. Shim, and J. An , “Direct alcohol-fueled low-temperature solid oxide fuel cells:A review,” energy technology, [Online], 7, pp.5-19,2019. Available:
[16] D. M. F. Santos and C. A. C. Sequeira, “Hydrogen production by alkaline water electrolysis,” Quimica Nova, [Online], 36, 8, pp. 1176-1193, 2013. Available:
[17] X. Vendrell and A.R. West, “Electrical properties of yttria-stabilized zirconia, YSZ Single crystal: local AC and long range DC conduction,” Journal of The Electrochemical Society, [Online], 165, 11, pp. F966-F975, 2018. Available: /11/ F966.full
[18] M. Biswas, “Solid oxide fuel cell,” [Online], Powder Metallurgy & Mining, 2, 3, pp.1-3, 2013. Available:
[19] B. Budiana, F. Fitriana, N. Ayu and S. Suasmoro, “Preparation and conductivity measurement of 7-8 mol % YSZ and 12 mol % CSZ for electrolyte SOFC,” Journal of Physics: Conference Series, [Online] 739, pp.1-7, 2016. Available:
[20] M. N. Tong, J. Binner, C. Munnings, B. Vaidhyanathan and H. Taherparvar, “Characterisation of submicron-grain sizedyttria -stabilised zirconia electrolyte for SOFCs,” Journal of Materials Science and Engineering, [Online], 5 , pp. 177-183, 2011. Available:
[21] A. F. Al-Attar, S. B. H. Farid, F. A. Hashim, and M. J. Eshraghi, “Comparison in physical and mechanical properties between doped and non-doped Y-TZP electrolyte for HT-SOFC,” Energy procedia, [Online], 157, pp.1285-1291, 2019. Available:
[22] ASTM, “Standard test method for determination of water absorption and associated properties by vacuum method for pressed ceramic tiles and glass tiles and boil method for extruded ceramic tiles and non-tile fired ceramic whiteware products,” ASTM C 373-17, 2017.
[23] A. S. Kumar, R. Balaji, and S. Jayakumar, “Effect of sintering on the structural and morphological properties of barium cerate based electrolyte for IT-SOFCs application,” Materials and Environmental Sciences, [Online], 9(9),pp.2599-2608,2018. Available:
[24] M. Anwar, A. M. Abdalla, M. R. Somalu, and A. Muchtar, “Effect of sintering temperature on the microstructure and ionic conductivity of Ce0.8Sm0.1Ba0.1 electrolyte,” Processing and Application of Ceramics, [Online], 11(1), pp.67–74, 2017. Available:
[25] N. R. Park, G. O. Park, and I. J. Shon,“ Pulsed current activated sintering of nanostructured ZrO2 and 3YSZ and their mechanical properties,” Journal of Nanoscience and Nanotechnology, [Online], 2019, 19, pp.2417–2420, 2019. Available:
[26] D. Panthi, N. Hedayat, Y.DU,“ Densification behavior of yttria-stabilized zirconia powders for solid oxide fuel cell electrolytes,” Journal of Advanced Ceramics,[Online],7(4),pp. 1-11, 2018. Available:
[27] X. Crispin, S. Marciniak, W. Osikowicz, G. Zotti, A. W. D.V.Gon, F. Louwet, M. Fahlman, L. Groenend,
F.D. chryver,W.R. Salaneck,“ Conductivity, morphology, interfacial chemistry, and stability of poly(3,4‐ethylene dioxythiophene)–poly(styrenesulfonate): A photoelectr-on spectroscopy study,” Journal of Polymer Science, Part B: Polymer Physics,[Online],Vol. 41, pp.2561–2583,2003 . Available:
[28] T. S. R. T. Naiwi, M. M. Aung, A. Ahmad,M. Rayung, M. S. Su’ait, N. A. Yusof, and K. Z.W. Lae, ‟Enhancement of Plasticizing effect on bio-basedpolyurethane acrylate solid polymer electrolyte and its properties,” Polymers,[Online], 10, 1142, pp1-18, 2018. Available:
[29] EG & G Services, Science Applications International Corporation, “Fuel cell hand book,” U.S department of Energy, office of Fossil Energy, National Energy Technology Laboratory, Morgantown, WV, Par- sons Inc., 5th ed. , 2000.
[30] M. Sharma and S. Yashonath, “Correlation between conductivity or diffusivity and activation energy in amorphous solids,” Journal of Chemical Physics, [Online], 129, 14, 144103, pp.1-11, 2008. Available: