Electrical Conductivity of Y³⁺ Doped Ba(Ce,Zr)O₃ in Wet N₂ Atmosphere Prepared with the Addition of Brij-97

Abstract:

Y-doped barium cerate-zirconate ceramic oxide is proven to be a competent material as an electrolyte with high proton conductivity as well as chemical and mechanical stabilities in carbon dioxide and water vapour atmospheres. This ceramic oxide requires high processing temperature which will results in the increase of particle/grain size. Hence, modification on the synthesis route has been studied in reducing the particle/grain size of the ceramic by lowering the calcination temperature. In this work, BaCe_0.54Zr_0.36Y_0.1O_2.95 (BCZY) powder was synthesized with addition of surfactant (Brij-97) through an established modified sol-gel route. Single BCZY perovskite phase was successfully obtained at calcination temperature of 950°C which was lower than our previous study (T=1100°C). The prepared sample was made into pellet by a dry pressing technique with diameter, d=13 mm and thickness, t~2 mm and then subjected to a two-step sintering method prior to morphological and electrical measurements. Impedance measurement was carried out at intermediate temperatures (500-800°C) using an Electrochemical Impedance Spectroscopy (EIS) in wet nitrogen atmosphere. Impedance spectrum was analysed to obtain the behaviour of grain core and grain boundary responses by a fitting procedure using a brick-layer model. Scanning electron microscope (SEM) analysis of fractured pellet revealed that BCZY prepared with the assisted of Brij-97 exhibited dense, homogenous and less agglomerate grain with grain size around 88 nm, which may explain the enhancement in the total conductivity of the BCZY electrolyte.

• Periodical: Solid State Phenomena (Volume 307)
• Pages: 160-165
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.307.160
• Online since: July 2020
• Authors: Mohd Affandi Nur Syafkeena, Nafisah Osman*, Oskar Hasdinor Hassan
• Keywords: Brick Layer Model, Cerate-Zirconate Oxide, Grain Size, Surfactant

References

[1] M. Kleitz, L. Dessemond, and M. C. Steil, Solid State Model for Ion-Blocking At Internal Interfaces in Zirconias, Solid State Ion. 75 (1995) 107–115.

DOI: 10.1016/0167-2738(94)00143-g

[2] A. J. Burggraaf, (1993). The Electrical Characterization of Grain Boundaries in Ultra-Fine Grained Y-TZP, Mater. Sci. Eng. A. 168 (1995) 231–234.

DOI: 10.1016/0921-5093(93)90732-t

[3] D. Frank, J. Kohlbrecher, R. Birringer, and A. Michels, Neutron Scattering Study of the Magnetic Microstructure of Nanocrystalline Gadolinium, Physical Review. B, Condensed Matter and Materials Physics. (2012) 1–17.

DOI: 10.1103/physrevb.85.094411

[4] N. A. Mazlan, N. Osman, A. M. M. Jani and M. H. Yaakob, Role of Ionic and Nonionic Surfactant on the Phase Formation and Morphology of Ba (Ce, Zr) O3 Solid Solution, J. Sol-Gel Sci. Technol. 78 (2015) 50–59.

DOI: 10.1007/s10971-015-3938-3

[5] G. Huang, S. Xu, L. Li, and X. Wang, Effect of Surfactants on Dispersion Property and Morphology of Nano-Sized Nickel Powders, T Nonferr Metal Soc. 24(11) (2014) 3739–3746.

DOI: 10.1016/s1003-6326(14)63523-8

[6] N. S. Affandi, N. Osman, and O. H. Hassan, Electrical Conductivity of Y3+-doped Ba(Ce,Zr)O3 in Wet Nitrogen Atmosphere, J. Phys. Conf. Ser. 1083 (2018).

DOI: 10.1088/1742-6596/1083/1/012027

[7] C. Mortalo, High conductivity and chemical stability of BaCe1-x-yZrxYyO3-d proton conductors prepared by a sol – gel method, J. Mater. Chem. 18 (2008) 5120–5128.

DOI: 10.1039/b808344d

[8] R. Li, Q. Zhen, M. Drache, A. Rubbens, C. Estournes, and R. Vannier, Synthesis and ion conductivity of (Bi2O3)0.75(Dy2O3)0.25 ceramics with grain sizes from the nano to the micro scale, Solid State Ion. 198 (2011) 6-15.

DOI: 10.1016/j.ssi.2011.05.012

[9] H. Avila-Paredes, J. Zhao, S. Wang, M. Pietrowski, R. De Souza, A. Reinholdt, Z. Munir, M. Martin, and S. Kim, Protonic conductivity of nano-structured yttria-stabilized zirconia: dependence on grain size, J. Mater. Chem. 20(5) (2010) 990-994.

DOI: 10.1039/b919100c

[10] E. Fabbri, L. Bi, H. Tanaka, D. Pergolesi, and E. Traversa, Chemically Stable Pr and Y Co-Doped Barium Zirconate Electrolytes with High Proton Conductivity for Intermediate-Temperature Solid Oxide Fuel Cells, Adv. Funct. Mater. (2011) 158–166.

DOI: 10.1002/adfm.201001540

[11] P. Sawant, S. Varma, B. Wani, and S. Bharadwaj, Synthesis, stability and conductivity of BaCe0.8−xZrxY0.2O3−δ as electrolyte for proton conducting SOFC, Int. J. Hydrog. Energy. 37(4) (2012) 3848-3856.

DOI: 10.1016/j.ijhydene.2011.04.106